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Cisco Security Advisory: Cisco IOS Software IPv6 Denial of Service Vulnerability



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Cisco Security Advisory: Cisco IOS Software IPv6 Denial of Service
Vulnerability

Advisory ID: cisco-sa-20110928-ipv6

Revision 1.0

For Public Release 2011 September 28 1600 UTC (GMT)

+--------------------------------------------------------------------

Summary
=======

Cisco IOS Software contains a vulnerability in the IP version 6
(IPv6) protocol stack implementation that could allow an
unauthenticated, remote attacker to cause a reload of an affected
device that has IPv6 enabled. The vulnerability may be triggered when
the device processes a malformed IPv6 packet.

Cisco has released free software updates that address this
vulnerability. There are no workarounds to mitigate this
vulnerability.

This advisory is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20110928-ipv6.shtml.

Note: The September 28, 2011, Cisco IOS Software Security Advisory
bundled publication includes ten Cisco Security Advisories. Nine of the
advisories address vulnerabilities in Cisco IOS Software, and one
advisory addresses a vulnerability in Cisco Unified Communications
Manager. Each advisory lists the Cisco IOS Software releases that
correct the vulnerability or vulnerabilities detailed in the advisory as
well as the Cisco IOS Software releases that correct all vulnerabilities
in the September 2011 Bundled Publication.

Individual publication links are in "Cisco Event Response: Semiannual
Cisco IOS Software Security Advisory Bundled Publication" at the
following link:

http://www.cisco.com/web/about/security/intelligence/Cisco_ERP_sep11.html

Affected Products
=================

This vulnerability affects devices that are running Cisco IOS
Software and configured for IPv6 operation. IPv6 is not enabled by
default in Cisco IOS Software.

Vulnerable Products
+------------------

Cisco devices that are running an affected version of Cisco IOS
Software and configured for IPv6 operation are vulnerable. A device
that is running Cisco IOS Software and that has IPv6 enabled will
show some interfaces with assigned IPv6 addresses when the "show ipv6
interface brief" command is executed.

The "show ipv6 interface brief" command will produce an error message
if the version of Cisco IOS Software in use does not support IPv6, or
will not show any interfaces with IPv6 address if IPv6 is disabled.
The system is not vulnerable in these scenarios.

Sample output of the "show ipv6 interface brief" command on a system
that is configured for IPv6 operation follows:

    router>show ipv6 interface brief
    FastEthernet0/0            [up/up]
        FE80::222:90FF:FEB0:1098
        2001:DB8:2:93::3
        200A:1::1
    FastEthernet0/1            [up/up]
        FE80::222:90FF:FEB0:1099
        2001:DB8:2:94::1
    Serial0/0/0                [down/down]
        unassigned
    Serial0/0/0.4              [down/down]
        unassigned
    Serial0/0/0.5              [down/down]
        unassigned
    Serial0/0/0.6              [down/down]
        unassigned

Alternatively, the IPv6 protocol is enabled if the interface
configuration command "ipv6 address <IPv6 address>" or "ipv6 enable"
is present in the configuration. Both may be present, as shown in the
vulnerable configuration in the following example shows:

    interface FastEthernet0/1
     ipv6 address 2001:0DB8:C18:1::/64 eui-64
    !
    interface FastEthernet0/2
     ipv6 enable

A device that is running Cisco IOS Software and that has IPv6 enabled
on a physical or logical interface is vulnerable even if ipv6
unicast-routing is globally disabled (that is, the device is not
routing IPv6 packets).

To determine the Cisco IOS Software release that is running on a Cisco
product, administrators can log in to the device and issue the "show
version" command to display the system banner. The system banner
confirms that the device is running Cisco IOS Software by displaying
text similar to "Cisco Internetwork Operating System Software" or "Cisco
IOS Software." The image name displays in parentheses, followed by
"Version" and the Cisco IOS Software release name. Other Cisco devices
do not have the "show version" command or may provide different output.

The following example identifies a Cisco product that is running
Cisco IOS Software Release 15.0(1)M1 with an installed image name of
C3900-UNIVERSALK9-M:

    Router> show version
    Cisco IOS Software, C3900 Software (C3900-UNIVERSALK9-M), Version 15.0(1)M1, RELEASE SOFTWARE (fc1)
    Technical Support: http://www.cisco.com/techsupport
    Copyright (c) 1986-2009 by Cisco Systems, Inc.
    Compiled Wed 02-Dec-09 17:17 by prod_rel_team

    !--- output truncated

Additional information about Cisco IOS Software release
naming conventions is available in the white paper Cisco
IOS and NX-OS Software Reference Guide available at
http://www.cisco.com/web/about/security/intelligence/ios-ref.html.

Products Confirmed Not Vulnerable
+--------------------------------

Cisco IOS XR Software and Cisco IOS XE Software are not affected by
this vulnerability.

No other Cisco products are currently known to be affected by this
vulnerability.

Details
=======

IPv6, which was designed by the Internet Engineering Task Force
(IETF), is intended to replace the current version, IP Version 4
(IPv4).

A vulnerability exists when Cisco IOS Software processes IPv6
packets. An attacker could exploit this vulnerability by sending
malformed IPv6 packets to physical or logical interfaces that are
configured to process IPv6 traffic. Transit traffic cannot trigger
this vulnerability. Exploitation could cause an affected system to
reload.

This vulnerability is documented in Cisco bug ID CSCtj41194, and
has been assigned Common Vulnerabilities and Exposures (CVE) ID
CVE-2011-0944.

Vulnerability Scoring Details
=============================

Cisco has provided scores for the vulnerability in this advisory
based on the Common Vulnerability Scoring System (CVSS). The CVSS
scoring in this Security Advisory is done in accordance with CVSS
version 2.0.

CVSS is a standards-based scoring method that conveys vulnerability
severity and helps determine urgency and priority of response.

Cisco has provided a base and temporal score. Customers can then
compute environmental scores to assist in determining the impact of
the vulnerability in individual networks.

Cisco has provided an FAQ to answer additional questions regarding
CVSS at:

http://www.cisco.com/web/about/security/intelligence/cvss-qandas.html

Cisco has also provided a CVSS calculator to help compute the
environmental impact for individual networks at:

http://intellishield.cisco.com/security/alertmanager/cvss


* CSCtj41194 ("Crafted IPv6 packet causes device reload")

CVSS Base Score - 7.8
    Access Vector -            Network
    Access Complexity -        Low
    Authentication -           None
    Confidentiality Impact -   None
    Integrity Impact -         None
    Availability Impact -      Complete

CVSS Temporal Score - 6.4
    Exploitability -           Functional
    Remediation Level -        Official-Fix
    Report Confidence -        Confirmed


Impact
======

Successful exploitation of the vulnerability that is described in
this advisory may cause a reload of an affected device. Repeated
exploitation could result in a sustained denial of service condition.

Software Versions and Fixes
===========================

When considering software upgrades, also consult
http://www.cisco.com/go/psirt and any subsequent advisories to determine
exposure and a complete upgrade solution.

In all cases, customers should exercise caution to be certain the
devices to be upgraded contain sufficient memory and that current
hardware and software configurations will continue to be supported
properly by the new release. If the information is not clear, contact
the Cisco Technical Assistance Center (TAC) or your contracted
maintenance provider for assistance.

Additionally, the Cisco IOS Software Checker is available on
the Cisco Security Intelligence Operations (SIO) portal at
http://tools.cisco.com/security/center/selectIOSVersion.x. It provides
several features for checking which Security Advisories affect specified
versions of Cisco IOS Software.

Cisco IOS Software
+-----------------

Each row of the following Cisco IOS Software table corresponds to a
Cisco IOS Software train. If a particular train is vulnerable, the
earliest releases that contain the fix are listed in the First Fixed
Release For This Advisory column. The First Fixed Release for All
Advisories in the September 2011 Bundled Publication column lists the
earliest possible releases that correct all the published
vulnerabilities in the Cisco IOS Software Security Advisory bundled
publication. Cisco recommends upgrading to the latest available
release, where possible.

+------------------------------------------------------------+
|   Major    |         Availability of Repaired Releases     |
|  Release   |                                               |
|------------+-----------------------------------------------|
|  Affected  |                    | First Fixed Release for  |
| 12.0-Based |    First Fixed     |  All Advisories in the   |
|  Releases  |      Release       |  September 2011 Bundled  |
|            |                    |       Publication        |
|------------------------------------------------------------|
| There are no affected 12.0 based releases                  |
|------------------------------------------------------------|
|  Affected  |                    | First Fixed Release for  |
| 12.1-Based |    First Fixed     |  All Advisories in the   |
|  Releases  |      Release       |  September 2011 Bundled  |
|            |                    |       Publication        |
|------------+--------------------+--------------------------|
| 12.1E      | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.2SXF       |
|------------+--------------------+--------------------------|
|  Affected  |                    | First Fixed Release for  |
| 12.2-Based |    First Fixed     |  All Advisories in the   |
|  Releases  |      Release       |  September 2011 Bundled  |
|            |                    |       Publication        |
|------------+--------------------+--------------------------|
| 12.2       | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.4          |
|------------+--------------------+--------------------------|
| 12.2B      | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.4          |
|------------+--------------------+--------------------------|
| 12.2BC     | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.4          |
|------------+--------------------+--------------------------|
| 12.2BW     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.2BX     | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.2SB        |
|------------+--------------------+--------------------------|
| 12.2BY     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.2BZ     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.2CX     | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.4          |
|------------+--------------------+--------------------------|
| 12.2CY     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.2CZ     | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.2SB        |
|------------+--------------------+--------------------------|
| 12.2DA     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.2DD     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.2DX     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.2EU     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
|            |                    | Releases up to and       |
| 12.2EW     | Not vulnerable     | including 12.2(20)EW4    |
|            |                    | are not vulnerable.      |
|------------+--------------------+--------------------------|
|            |                    | Vulnerable; contact your |
|            |                    | support organization per |
| 12.2EWA    | Not vulnerable     | the instructions in      |
|            |                    | Obtaining Fixed Software |
|            |                    | section of this          |
|            |                    | advisory.                |
|------------+--------------------+--------------------------|
| 12.2EX     | Not vulnerable     | 12.2(55)EX3              |
|------------+--------------------+--------------------------|
| 12.2EY     | Not vulnerable     | 12.2(58)EY               |
|------------+--------------------+--------------------------|
| 12.2EZ     | Not vulnerable     | Vulnerable; migrate to   |
|            |                    | any release in 15.0SE    |
|------------+--------------------+--------------------------|
| 12.2FX     | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.2SE        |
|------------+--------------------+--------------------------|
| 12.2FY     | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.2EX        |
|------------+--------------------+--------------------------|
| 12.2FZ     | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.2SE        |
|------------+--------------------+--------------------------|
| 12.2IRA    | Not vulnerable     | Vulnerable; migrate to   |
|            |                    | any release in 12.2IRG   |
|------------+--------------------+--------------------------|
| 12.2IRB    | Not vulnerable     | Vulnerable; migrate to   |
|            |                    | any release in 12.2IRG   |
|------------+--------------------+--------------------------|
| 12.2IRC    | Not vulnerable     | Vulnerable; migrate to   |
|            |                    | any release in 12.2IRG   |
|------------+--------------------+--------------------------|
|            |                    | Vulnerable; contact your |
|            |                    | support organization per |
| 12.2IRD    | Not vulnerable     | the instructions in the  |
|            |                    | Obtaining Fixed Software |
|            |                    | section of this          |
|            |                    | advisory.                |
|------------+--------------------+--------------------------|
|            |                    | Vulnerable; contact your |
|            |                    | support organization per |
| 12.2IRE    | Not vulnerable     | the instructions in the  |
|            |                    | Obtaining Fixed Software |
|            |                    | section of this          |
|            |                    | advisory.                |
|------------+--------------------+--------------------------|
| 12.2IRF    | Not vulnerable     | Vulnerable; migrate to   |
|            |                    | any release in 12.2IRG   |
|------------+--------------------+--------------------------|
| 12.2IRG    | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
|            |                    | Vulnerable; contact your |
|            |                    | support organization per |
| 12.2IXA    | Not vulnerable     | the instructions in the  |
|            |                    | Obtaining Fixed Software |
|            |                    | section of this          |
|            |                    | advisory.                |
|------------+--------------------+--------------------------|
|            |                    | Vulnerable; contact your |
|            |                    | support organization per |
| 12.2IXB    | Not vulnerable     | the instructions in the  |
|            |                    | Obtaining Fixed Software |
|            |                    | section of this          |
|            |                    | advisory.                |
|------------+--------------------+--------------------------|
|            |                    | Vulnerable; contact your |
|            |                    | support organization per |
| 12.2IXC    | Not vulnerable     | the instructions in the  |
|            |                    | Obtaining Fixed Software |
|            |                    | section of this          |
|            |                    | advisory.                |
|------------+--------------------+--------------------------|
|            |                    | Vulnerable; contact your |
|            |                    | support organization per |
| 12.2IXD    | Not vulnerable     | the instructions in the  |
|            |                    | Obtaining Fixed Software |
|            |                    | section of this          |
|            |                    | advisory.                |
|------------+--------------------+--------------------------|
|            |                    | Vulnerable; contact your |
|            |                    | support organization per |
| 12.2IXE    | Not vulnerable     | the instructions in the  |
|            |                    | Obtaining Fixed Software |
|            |                    | section of this          |
|            |                    | advisory.                |
|------------+--------------------+--------------------------|
|            |                    | Vulnerable; contact your |
|            |                    | support organization per |
| 12.2IXF    | Not vulnerable     | the instructions in the  |
|            |                    | Obtaining Fixed Software |
|            |                    | section of this          |
|            |                    | advisory.                |
|------------+--------------------+--------------------------|
|            |                    | Vulnerable; contact your |
|            |                    | support organization per |
| 12.2IXG    | Not vulnerable     | the instructions in the  |
|            |                    | Obtaining Fixed Software |
|            |                    | section of this          |
|            |                    | advisory.                |
|------------+--------------------+--------------------------|
|            |                    | Vulnerable; contact your |
|            |                    | support organization per |
| 12.2IXH    | Not vulnerable     | the instructions in the  |
|            |                    | Obtaining Fixed Software |
|            |                    | section of this          |
|            |                    | advisory.                |
|------------+--------------------+--------------------------|
| 12.2JA     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.2JK     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.2MB     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.2MC     | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.4          |
|------------+--------------------+--------------------------|
| 12.2MRA    | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.2SRD       |
|------------+--------------------+--------------------------|
| 12.2MRB    | Not vulnerable     | 12.2(33)MRB5             |
|------------+--------------------+--------------------------|
|            |                    | Releases prior to 12.2   |
|            |                    | (30)S are vulnerable;    |
| 12.2S      | Not vulnerable     | Releases 12.2(30)S and   |
|            |                    | later are not            |
|            |                    | vulnerable. First fixed  |
|            |                    | in Release 12.2SB        |
|------------+--------------------+--------------------------|
| 12.2SB     | Not vulnerable     | 12.2(31)SB2012.2(33)SB10 |
|------------+--------------------+--------------------------|
| 12.2SBC    | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.2SB        |
|------------+--------------------+--------------------------|
| 12.2SCA    | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.2SCC       |
|------------+--------------------+--------------------------|
| 12.2SCB    | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.2SCC       |
|------------+--------------------+--------------------------|
| 12.2SCC    | Not vulnerable     | 12.2(33)SCC7             |
|------------+--------------------+--------------------------|
| 12.2SCD    | Not vulnerable     | 12.2(33)SCD6             |
|------------+--------------------+--------------------------|
| 12.2SCE    | Not vulnerable     | 12.2(33)SCE112.2(33)SCE2 |
|------------+--------------------+--------------------------|
| 12.2SCF    | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.2SE     | Not vulnerable     | 12.2(55)SE312.2(58)SE    |
|------------+--------------------+--------------------------|
| 12.2SEA    | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.2SE        |
|------------+--------------------+--------------------------|
| 12.2SEB    | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.2SE        |
|------------+--------------------+--------------------------|
| 12.2SEC    | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.2SE        |
|------------+--------------------+--------------------------|
| 12.2SED    | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.2SE        |
|------------+--------------------+--------------------------|
| 12.2SEE    | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.2SE        |
|------------+--------------------+--------------------------|
| 12.2SEF    | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.2SE        |
|------------+--------------------+--------------------------|
|            |                    | Releases prior to 12.2   |
|            |                    | (25)SEG4 are vulnerable; |
| 12.2SEG    | Not vulnerable     | Releases 12.2(25)SEG4    |
|            |                    | and later are not        |
|            |                    | vulnerable. First fixed  |
|            |                    | in Release 12.2EX        |
|------------+--------------------+--------------------------|
|            |                    | Releases prior to 12.2   |
|            |                    | (53)SG4 are vulnerable;  |
| 12.2SG     | Not vulnerable     | Releases 12.2(53)SG4 and |
|            |                    | later are not            |
|            |                    | vulnerable.              |
|------------+--------------------+--------------------------|
|            |                    | Vulnerable; contact your |
|            |                    | support organization per |
| 12.2SGA    | Not vulnerable     | the instructions in      |
|            |                    | Obtaining Fixed Software |
|            |                    | section of this          |
|            |                    | advisory.                |
|------------+--------------------+--------------------------|
| 12.2SL     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
|            |                    | Vulnerable; contact your |
|            |                    | support organization per |
| 12.2SM     | Not vulnerable     | the instructions in      |
|            |                    | Obtaining Fixed Software |
|            |                    | section of this          |
|            |                    | advisory.                |
|------------+--------------------+--------------------------|
| 12.2SO     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.2SQ     | Not vulnerable     | 12.2(50)SQ3              |
|------------+--------------------+--------------------------|
| 12.2SRA    | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.2SRD       |
|------------+--------------------+--------------------------|
| 12.2SRB    | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.2SRD       |
|------------+--------------------+--------------------------|
| 12.2SRC    | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.2SRD       |
|------------+--------------------+--------------------------|
| 12.2SRD    | Not vulnerable     | 12.2(33)SRD6             |
|------------+--------------------+--------------------------|
| 12.2SRE    | Not vulnerable     | 12.2(33)SRE4             |
|------------+--------------------+--------------------------|
| 12.2STE    | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.2SU     | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.4          |
|------------+--------------------+--------------------------|
|            |                    | Releases prior to 12.2   |
|            |                    | (29a)SV are vulnerable;  |
| 12.2SV     | Not vulnerable     | Releases 12.2(29a)SV and |
|            |                    | later are not            |
|            |                    | vulnerable. Migrate to   |
|            |                    | any release in 12.2SVD   |
|------------+--------------------+--------------------------|
| 12.2SVA    | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.2SVC    | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.2SVD    | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.2SVE    | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
|            |                    | Vulnerable; contact your |
|            |                    | support organization per |
| 12.2SW     | Not vulnerable     | the instructions in the  |
|            |                    | Obtaining Fixed Software |
|            |                    | section of this          |
|            |                    | advisory.                |
|------------+--------------------+--------------------------|
| 12.2SX     | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.2SXF       |
|------------+--------------------+--------------------------|
| 12.2SXA    | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.2SXF       |
|------------+--------------------+--------------------------|
| 12.2SXB    | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.2SXF       |
|------------+--------------------+--------------------------|
| 12.2SXD    | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.2SXF       |
|------------+--------------------+--------------------------|
| 12.2SXE    | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.2SXF       |
|------------+--------------------+--------------------------|
| 12.2SXF    | Not vulnerable     | 12.2(18)SXF17b           |
|------------+--------------------+--------------------------|
| 12.2SXH    | Not vulnerable     | 12.2(33)SXH8a            |
|------------+--------------------+--------------------------|
| 12.2SXI    | Not vulnerable     | 12.2(33)SXI6             |
|------------+--------------------+--------------------------|
| 12.2SXJ    | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.2SY     | Not vulnerable     | 12.2(50)SY               |
|------------+--------------------+--------------------------|
| 12.2SZ     | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.2SB        |
|------------+--------------------+--------------------------|
| 12.2T      | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.4          |
|------------+--------------------+--------------------------|
|            |                    | Vulnerable; contact your |
|            |                    | support organization per |
| 12.2TPC    | Not vulnerable     | the instructions in the  |
|            |                    | Obtaining Fixed Software |
|            |                    | section of this          |
|            |                    | advisory.                |
|------------+--------------------+--------------------------|
| 12.2XA     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.2XB     | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.4          |
|------------+--------------------+--------------------------|
| 12.2XC     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.2XD     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.2XE     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.2XF     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.2XG     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.2XH     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.2XI     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.2XJ     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.2XK     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.2XL     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.2XM     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.2XN     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
|            | See Cisco IOS-XE   | See Cisco IOS-XE         |
| 12.2XNA    | Software           | Software Availability    |
|            | Availability       |                          |
|------------+--------------------+--------------------------|
|            | See Cisco IOS-XE   | See Cisco IOS-XE         |
| 12.2XNB    | Software           | Software Availability    |
|            | Availability       |                          |
|------------+--------------------+--------------------------|
|            | See Cisco IOS-XE   | See Cisco IOS-XE         |
| 12.2XNC    | Software           | Software Availability    |
|            | Availability       |                          |
|------------+--------------------+--------------------------|
|            | See Cisco IOS-XE   | See Cisco IOS-XE         |
| 12.2XND    | Software           | Software Availability    |
|            | Availability       |                          |
|------------+--------------------+--------------------------|
|            | See Cisco IOS-XE   | See Cisco IOS-XE         |
| 12.2XNE    | Software           | Software Availability    |
|            | Availability       |                          |
|------------+--------------------+--------------------------|
|            | See Cisco IOS-XE   | See Cisco IOS-XE         |
| 12.2XNF    | Software           | Software Availability    |
|            | Availability       |                          |
|------------+--------------------+--------------------------|
|            |                    | Releases prior to 12.2   |
|            |                    | (54)XO are vulnerable;   |
| 12.2XO     | Not vulnerable     | Releases 12.2(54)XO and  |
|            |                    | later are not            |
|            |                    | vulnerable.              |
|------------+--------------------+--------------------------|
| 12.2XQ     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.2XR     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.2XS     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.2XT     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.2XU     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.2XV     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.2XW     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.2YA     | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.4          |
|------------+--------------------+--------------------------|
| 12.2YB     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.2YC     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.2YD     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.2YE     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
|            |                    | Vulnerable; contact your |
|            |                    | support organization per |
| 12.2YF     | Not vulnerable     | the instructions in the  |
|            |                    | Obtaining Fixed Software |
|            |                    | section of this          |
|            |                    | advisory.                |
|------------+--------------------+--------------------------|
|            |                    | Vulnerable; contact your |
|            |                    | support organization per |
| 12.2YG     | Not vulnerable     | the instructions in the  |
|            |                    | Obtaining Fixed Software |
|            |                    | section of this          |
|            |                    | advisory.                |
|------------+--------------------+--------------------------|
|            |                    | Vulnerable; contact your |
|            |                    | support organization per |
| 12.2YH     | Not vulnerable     | the instructions in the  |
|            |                    | Obtaining Fixed Software |
|            |                    | section of this          |
|            |                    | advisory.                |
|------------+--------------------+--------------------------|
|            |                    | Vulnerable; contact your |
|            |                    | support organization per |
| 12.2YJ     | Not vulnerable     | the instructions in      |
|            |                    | Obtaining Fixed Software |
|            |                    | section of this          |
|            |                    | advisory.                |
|------------+--------------------+--------------------------|
| 12.2YK     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
|            |                    | Vulnerable; contact your |
|            |                    | support organization per |
| 12.2YL     | Not vulnerable     | the instructions in the  |
|            |                    | Obtaining Fixed Software |
|            |                    | section of this          |
|            |                    | advisory.                |
|------------+--------------------+--------------------------|
| 12.2YM     | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.4          |
|------------+--------------------+--------------------------|
|            |                    | Vulnerable; contact your |
|            |                    | support organization per |
| 12.2YN     | Not vulnerable     | the instructions in the  |
|            |                    | Obtaining Fixed Software |
|            |                    | section of this          |
|            |                    | advisory.                |
|------------+--------------------+--------------------------|
| 12.2YO     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.2YP     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
|            |                    | Vulnerable; contact your |
|            |                    | support organization per |
| 12.2YQ     | Not vulnerable     | the instructions in the  |
|            |                    | Obtaining Fixed Software |
|            |                    | section of this          |
|            |                    | advisory.                |
|------------+--------------------+--------------------------|
|            |                    | Vulnerable; contact your |
|            |                    | support organization per |
| 12.2YR     | Not vulnerable     | the instructions in the  |
|            |                    | Obtaining Fixed Software |
|            |                    | section of this          |
|            |                    | advisory.                |
|------------+--------------------+--------------------------|
|            |                    | Vulnerable; contact your |
|            |                    | support organization per |
| 12.2YS     | Not vulnerable     | the instructions in the  |
|            |                    | Obtaining Fixed Software |
|            |                    | section of this          |
|            |                    | advisory.                |
|------------+--------------------+--------------------------|
|            |                    | Vulnerable; contact your |
|            |                    | support organization per |
| 12.2YT     | Not vulnerable     | the instructions in the  |
|            |                    | Obtaining Fixed Software |
|            |                    | section of this          |
|            |                    | advisory.                |
|------------+--------------------+--------------------------|
|            |                    | Vulnerable; contact your |
|            |                    | support organization per |
| 12.2YU     | Not vulnerable     | the instructions in the  |
|            |                    | Obtaining Fixed Software |
|            |                    | section of this          |
|            |                    | advisory.                |
|------------+--------------------+--------------------------|
|            |                    | Vulnerable; contact your |
|            |                    | support organization per |
| 12.2YV     | Not vulnerable     | the instructions in the  |
|            |                    | Obtaining Fixed Software |
|            |                    | section of this          |
|            |                    | advisory.                |
|------------+--------------------+--------------------------|
|            |                    | Vulnerable; contact your |
|            |                    | support organization per |
| 12.2YW     | Not vulnerable     | the instructions in the  |
|            |                    | Obtaining Fixed Software |
|            |                    | section of this          |
|            |                    | advisory.                |
|------------+--------------------+--------------------------|
|            |                    | Vulnerable; contact your |
|            |                    | support organization per |
| 12.2YX     | Not vulnerable     | the instructions in the  |
|            |                    | Obtaining Fixed Software |
|            |                    | section of this          |
|            |                    | advisory.                |
|------------+--------------------+--------------------------|
|            |                    | Vulnerable; contact your |
|            |                    | support organization per |
| 12.2YY     | Not vulnerable     | the instructions in the  |
|            |                    | Obtaining Fixed Software |
|            |                    | section of this          |
|            |                    | advisory.                |
|------------+--------------------+--------------------------|
|            |                    | Vulnerable; contact your |
|            |                    | support organization per |
| 12.2YZ     | Not vulnerable     | the instructions in the  |
|            |                    | Obtaining Fixed Software |
|            |                    | section of this          |
|            |                    | advisory.                |
|------------+--------------------+--------------------------|
| 12.2ZA     | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.2SXF       |
|------------+--------------------+--------------------------|
|            |                    | Vulnerable; contact your |
|            |                    | support organization per |
| 12.2ZB     | Not vulnerable     | the instructions in the  |
|            |                    | Obtaining Fixed Software |
|            |                    | section of this          |
|            |                    | advisory.                |
|------------+--------------------+--------------------------|
| 12.2ZC     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.2ZD     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.2ZE     | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.4          |
|------------+--------------------+--------------------------|
| 12.2ZF     | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.4          |
|------------+--------------------+--------------------------|
| 12.2ZG     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.2ZH     | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.4          |
|------------+--------------------+--------------------------|
| 12.2ZJ     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
|            |                    | Vulnerable; contact your |
|            |                    | support organization per |
| 12.2ZL     | Not vulnerable     | the instructions in the  |
|            |                    | Obtaining Fixed Software |
|            |                    | section of this          |
|            |                    | advisory.                |
|------------+--------------------+--------------------------|
| 12.2ZP     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.2ZU     | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.2SXH       |
|------------+--------------------+--------------------------|
| 12.2ZX     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
|            |                    | Vulnerable; contact your |
|            |                    | support organization per |
| 12.2ZY     | Not vulnerable     | the instructions in the  |
|            |                    | Obtaining Fixed Software |
|            |                    | section of this          |
|            |                    | advisory.                |
|------------+--------------------+--------------------------|
|            |                    | Vulnerable; contact your |
|            |                    | support organization per |
| 12.2ZYA    | Not vulnerable     | the instructions in the  |
|            |                    | Obtaining Fixed Software |
|            |                    | section of this          |
|            |                    | advisory.                |
|------------+--------------------+--------------------------|
|  Affected  |                    | First Fixed Release for  |
| 12.3-Based |    First Fixed     |  All Advisories in the   |
|  Releases  |      Release       |  September 2011 Bundled  |
|            |                    |       Publication        |
|------------------------------------------------------------|
| There are no affected 12.3 based releases                  |
|------------------------------------------------------------|
|  Affected  |                    | First Fixed Release for  |
| 12.4-Based |    First Fixed     |  All Advisories in the   |
|  Releases  |      Release       |  September 2011 Bundled  |
|            |                    |       Publication        |
|------------+--------------------+--------------------------|
| 12.4       | Not vulnerable     | 12.4(25f)                |
|------------+--------------------+--------------------------|
| 12.4GC     | 12.4(24)GC4        | 12.4(24)GC4              |
|------------+--------------------+--------------------------|
| 12.4JA     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.4JAX    | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.4JDA    | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.4JDC    | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.4JHA    | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.4JHB    | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.4JHC    | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.4JK     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.4JL     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.4JMA    | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.4JMB    | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
|            |                    | Vulnerable; migrate to   |
|            |                    | any release in 12.4JA    |
| 12.4JX     | Not vulnerable     |                          |
|            |                    | Releases up to and       |
|            |                    | including 12.4(21a)JX    |
|            |                    | are not vulnerable.      |
|------------+--------------------+--------------------------|
| 12.4JY     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.4MD     | Not vulnerable     | 12.4(24)MD6 on           |
|            |                    | 28-Oct-2011              |
|------------+--------------------+--------------------------|
| 12.4MDA    | Not vulnerable     | 12.4(24)MDA7             |
|------------+--------------------+--------------------------|
| 12.4MDB    | Not vulnerable     | 12.4(24)MDB3             |
|------------+--------------------+--------------------------|
|            |                    | Vulnerable; contact your |
|            |                    | support organization per |
| 12.4MR     | Not vulnerable     | the instructions in the  |
|            |                    | Obtaining Fixed Software |
|            |                    | section of this          |
|            |                    | advisory.                |
|------------+--------------------+--------------------------|
|            |                    | Vulnerable; contact your |
|            |                    | support organization per |
| 12.4MRA    | Not vulnerable     | the instructions in the  |
|            |                    | Obtaining Fixed Software |
|            |                    | section of this          |
|            |                    | advisory.                |
|------------+--------------------+--------------------------|
| 12.4MRB    | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.4T         |
|------------+--------------------+--------------------------|
| 12.4SW     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
|            | Only 12.4(24)T     |                          |
|            | through 12.4(24)T4 | 12.4(24)T6               |
| 12.4T      | are affected;      |                          |
|            | first fixed in     | 12.4(15)T16              |
|            | 12.4(24)T3c and    |                          |
|            | 12.4(24)T5         |                          |
|------------+--------------------+--------------------------|
| 12.4XA     | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.4T         |
|------------+--------------------+--------------------------|
| 12.4XB     | Not vulnerable     | 12.4(2)XB12              |
|------------+--------------------+--------------------------|
| 12.4XC     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.4XD     | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.4T         |
|------------+--------------------+--------------------------|
| 12.4XE     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.4XF     | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.4T         |
|------------+--------------------+--------------------------|
| 12.4XG     | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.4T         |
|------------+--------------------+--------------------------|
| 12.4XJ     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.4XK     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
|            |                    | Vulnerable; contact your |
|            |                    | support organization per |
| 12.4XL     | Not vulnerable     | the instructions in      |
|            |                    | Obtaining Fixed Software |
|            |                    | section of this          |
|            |                    | advisory.                |
|------------+--------------------+--------------------------|
| 12.4XM     | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.4T         |
|------------+--------------------+--------------------------|
|            |                    | Vulnerable; contact your |
|            |                    | support organization per |
| 12.4XN     | Not vulnerable     | the instructions in      |
|            |                    | Obtaining Fixed Software |
|            |                    | section of this          |
|            |                    | advisory.                |
|------------+--------------------+--------------------------|
|            |                    | Vulnerable; contact your |
|            |                    | support organization per |
| 12.4XP     | Not vulnerable     | the instructions in      |
|            |                    | Obtaining Fixed Software |
|            |                    | section of this          |
|            |                    | advisory.                |
|------------+--------------------+--------------------------|
| 12.4XQ     | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.4T         |
|------------+--------------------+--------------------------|
| 12.4XR     | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.4T         |
|------------+--------------------+--------------------------|
| 12.4XT     | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.4T         |
|------------+--------------------+--------------------------|
| 12.4XV     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
| 12.4XW     | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.4T         |
|------------+--------------------+--------------------------|
| 12.4XY     | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.4T         |
|------------+--------------------+--------------------------|
| 12.4XZ     | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.4T         |
|------------+--------------------+--------------------------|
| 12.4YA     | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 12.4T         |
|------------+--------------------+--------------------------|
|            |                    | Vulnerable; contact your |
|            |                    | support organization per |
| 12.4YB     | Not vulnerable     | the instructions in the  |
|            |                    | Obtaining Fixed Software |
|            |                    | section of this          |
|            |                    | advisory.                |
|------------+--------------------+--------------------------|
|            |                    | Vulnerable; contact your |
|            |                    | support organization per |
| 12.4YD     | Not vulnerable     | the instructions in the  |
|            |                    | Obtaining Fixed Software |
|            |                    | section of this          |
|            |                    | advisory.                |
|------------+--------------------+--------------------------|
|            |                    | Vulnerable; fixed in     |
|            |                    | 12.4(22)YE6 on           |
| 12.4YE     | Not vulnerable     | 30-Sept-2011; 12.4(24)   |
|            |                    | YE7 available on         |
|            |                    | 17-Oct-2011              |
|------------+--------------------+--------------------------|
|            |                    | Vulnerable; contact your |
|            |                    | support organization per |
| 12.4YG     | Not vulnerable     | the instructions in the  |
|            |                    | Obtaining Fixed Software |
|            |                    | section of this          |
|            |                    | advisory.                |
|------------+--------------------+--------------------------|
|  Affected  |                    | First Fixed Release for  |
| 15.0-Based |    First Fixed     |  All Advisories in the   |
|  Releases  |      Release       |  September 2011 Bundled  |
|            |                    |       Publication        |
|------------+--------------------+--------------------------|
| 15.0M      | 15.0(1)M5          | 15.0(1)M7                |
|------------+--------------------+--------------------------|
|            |                    | Vulnerable; contact your |
|            |                    | support organization per |
| 15.0MR     | Not vulnerable     | the instructions in the  |
|            |                    | Obtaining Fixed Software |
|            |                    | section of this          |
|            |                    | advisory.                |
|------------+--------------------+--------------------------|
|            |                    | Vulnerable; contact your |
|            |                    | support organization per |
| 15.0MRA    | Not vulnerable     | the instructions in the  |
|            |                    | Obtaining Fixed Software |
|            |                    | section of this          |
|            |                    | advisory.                |
|------------+--------------------+--------------------------|
|            | Not vulnerable     | 15.0(1)S4                |
|            |                    |                          |
| 15.0S      | Cisco IOS XE       | Cisco IOS XE devices:    |
|            | devices: see Cisco | see Cisco IOS-XE         |
|            | IOS-XE Software    | Software Availability    |
|            | Availability       |                          |
|------------+--------------------+--------------------------|
|            |                    | Vulnerable; contact your |
|            |                    | support organization per |
| 15.0SA     | Not vulnerable     | the instructions in the  |
|            |                    | Obtaining Fixed Software |
|            |                    | section of this          |
|            |                    | advisory.                |
|------------+--------------------+--------------------------|
| 15.0SE     | Not vulnerable     | Not vulnerable           |
|------------+--------------------+--------------------------|
|            | Cisco IOS XE       | Cisco IOS XE devices:    |
| 15.0SG     | devices: see Cisco | see Cisco IOS-XE         |
|            | IOS-XE Software    | Software Availability    |
|            | Availability       |                          |
|------------+--------------------+--------------------------|
|            | Vulnerable; First  | Vulnerable; First fixed  |
| 15.0XA     | fixed in Release   | in Release 15.1T         |
|            | 15.1T              |                          |
|------------+--------------------+--------------------------|
|            | Cisco IOS XE       |                          |
|            | devices: Please    | Cisco IOS XE devices:    |
| 15.0XO     | see Cisco IOS-XE   | Please see Cisco IOS-XE  |
|            | Software           | Software Availability    |
|            | Availability       |                          |
|------------+--------------------+--------------------------|
|  Affected  |                    | First Fixed Release for  |
| 15.1-Based |    First Fixed     |  All Advisories in the   |
|  Releases  |      Release       |  September 2011 Bundled  |
|            |                    |       Publication        |
|------------+--------------------+--------------------------|
|            |                    | Vulnerable; contact your |
|            |                    | support organization per |
| 15.1EY     | Not vulnerable     | the instructions in the  |
|            |                    | Obtaining Fixed Software |
|            |                    | section of this          |
|            |                    | advisory.                |
|------------+--------------------+--------------------------|
| 15.1GC     | Not vulnerable     | Vulnerable; First fixed  |
|            |                    | in Release 15.1T         |
|------------+--------------------+--------------------------|
| 15.1M      | Not vulnerable     | 15.1(4)M2; Available on  |
|            |                    | 30-SEP-11                |
|------------+--------------------+--------------------------|
|            |                    | Vulnerable; contact your |
|            |                    | support organization per |
| 15.1MR     | Not vulnerable     | the instructions in the  |
|            |                    | Obtaining Fixed Software |
|            |                    | section of this          |
|            |                    | advisory.                |
|------------+--------------------+--------------------------|
|            | Not vulnerable     | 15.1(2)S2                |
|            |                    |                          |
|            | Cisco IOS XE       | 15.1(3)S                 |
| 15.1S      | devices: See Cisco |                          |
|            | IOS-XE Software    | Cisco IOS XE devices:    |
|            | Availability       | See Cisco IOS-XE         |
|            |                    | Software Availability    |
|------------+--------------------+--------------------------|
|            | 15.1(1)T3          |                          |
|            |                    | 15.1(2)T4 15.1(1)T4 on   |
| 15.1T      | 15.1(2)T3          | 8-Dec-2011               |
|            |                    |                          |
|            | 15.1(3)T1          |                          |
|------------+--------------------+--------------------------|
|            | Vulnerable; First  | Vulnerable; First fixed  |
| 15.1XB     | fixed in Release   | in Release 15.1T         |
|            | 15.1T              |                          |
|------------+--------------------+--------------------------|
|  Affected  |                    | First Fixed Release for  |
| 15.2-Based |    First Fixed     |  All Advisories in the   |
|  Releases  |      Release       |  September 2011 Bundled  |
|            |                    |       Publication        |
|------------------------------------------------------------|
| There are no affected 15.2 based releases                  |
+------------------------------------------------------------+

Cisco IOS XE Software
+--------------------

+------------------------------------------------------------+
|  Cisco   |   First    |    First Fixed Release for All     |
|  IOS XE  |   Fixed    |  Advisories in the September 2011  |
| Release  |  Release   |        Bundled Publication         |
|----------+------------+------------------------------------|
| 2.1.x    | Not        | Vulnerable; migrate to 3.3.2S or   |
|          | vulnerable | later                              |
|----------+------------+------------------------------------|
| 2.2.x    | Not        | Vulnerable; migrate to 3.3.2S or   |
|          | vulnerable | later                              |
|----------+------------+------------------------------------|
| 2.3.x    | Not        | Vulnerable; migrate to 3.3.2S or   |
|          | vulnerable | later                              |
|----------+------------+------------------------------------|
| 2.4.x    | Not        | Vulnerable; migrate to 3.3.2S or   |
|          | vulnerable | later                              |
|----------+------------+------------------------------------|
| 2.5.x    | Not        | Vulnerable; migrate to 3.3.2S or   |
|          | vulnerable | later                              |
|----------+------------+------------------------------------|
| 2.6.x    | Not        | Vulnerable; migrate to 3.3.2S or   |
|          | vulnerable | later                              |
|----------+------------+------------------------------------|
| 3.1.xS   | Not        | Vulnerable; migrate to 3.3.2S or   |
|          | vulnerable | later                              |
|----------+------------+------------------------------------|
| 3.1.xSG  | Not        | Vulnerable; migrate to 3.2.0SG or  |
|          | vulnerable | later                              |
|----------+------------+------------------------------------|
| 3.2.xS   | Not        | Vulnerable; migrate to 3.3.2S or   |
|          | vulnerable | later                              |
|----------+------------+------------------------------------|
| 3.2.xSG  | Not        | Not vulnerable                     |
|          | vulnerable |                                    |
|----------+------------+------------------------------------|
| 3.3.xS   | Not        | 3.3.2S                             |
|          | vulnerable |                                    |
|----------+------------+------------------------------------|
| 3.4.xS   | Not        | Not vulnerable                     |
|          | vulnerable |                                    |
+------------------------------------------------------------+

For mapping of Cisco IOS XE to Cisco IOS releases, please refer to
the Cisco IOS XE 2 Release Notes, Cisco IOS XE 3S Release Notes, and
Cisco IOS XE 3SG Release Notes.

Cisco IOS XR Software
+--------------------

Cisco IOS XR Software is not affected by any of the vulnerabilities
in the September 2011 bundled publication.

Workarounds
===========

There are no workarounds for this vulnerability if IPv6 configuration
is required.

Obtaining Fixed Software
========================

Cisco has released free software updates that address this
vulnerability. Prior to deploying software, customers should consult
their maintenance provider or check the software for feature set
compatibility and known issues specific to their environment.

Customers may only install and expect support for the feature
sets they have purchased. By installing, downloading, accessing
or otherwise using such software upgrades, customers agree to be
bound by the terms of Cisco's software license terms found at
http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html,
or as otherwise set forth at Cisco.com Downloads at
http://www.cisco.com/public/sw-center/sw-usingswc.shtml.

Do not contact psirt@xxxxxxxxx or security-alert@xxxxxxxxx for
software upgrades.

Customers with Service Contracts
+-------------------------------

Customers with contracts should obtain upgraded software through
their regular update channels. For most customers, this means that
upgrades should be obtained through the Software Center on Cisco's
worldwide website at http://www.cisco.com.

Customers using Third Party Support Organizations
+------------------------------------------------

Customers whose Cisco products are provided or maintained through
prior or existing agreements with third-party support organizations,
such as Cisco Partners, authorized resellers, or service providers
should contact that support organization for guidance and assistance
with the appropriate course of action in regards to this advisory.

The effectiveness of any workaround or fix is dependent on specific
customer situations, such as product mix, network topology, traffic
behavior, and organizational mission. Due to the variety of affected
products and releases, customers should consult with their service
provider or support organization to ensure any applied workaround or
fix is the most appropriate for use in the intended network before it
is deployed.

Customers without Service Contracts
+----------------------------------

Customers who purchase direct from Cisco but do not hold a Cisco
service contract, and customers who purchase through third-party
vendors but are unsuccessful in obtaining fixed software through
their point of sale should acquire upgrades by contacting the Cisco
Technical Assistance Center (TAC). TAC contacts are as follows.

  * +1 800 553 2447 (toll free from within North America)
  * +1 408 526 7209 (toll call from anywhere in the world)
  * e-mail: tac@xxxxxxxxx

Customers should have their product serial number available and be
prepared to give the URL of this notice as evidence of entitlement to
a free upgrade. Free upgrades for non-contract customers must be
requested through the TAC.

Refer to
http://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html
for additional TAC contact information, including localized telephone
numbers, and instructions and e-mail addresses for use in various
languages.

Exploitation and Public Announcements
=====================================

The Cisco PSIRT is not aware of any public announcements or malicious
use of the vulnerability that is described in this advisory.

This vulnerability was discovered by Cisco during internal testing.

Status of this Notice: FINAL
============================

THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY
KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE
INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS
AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS
DOCUMENT AT ANY TIME.

A stand-alone copy or Paraphrase of the text of this document that
omits the distribution URL in the following section is an
uncontrolled copy, and may lack important information or contain
factual errors.

Distribution
============

This advisory is posted on Cisco's worldwide website at:

http://www.cisco.com/warp/public/707/cisco-sa-20110928-ipv6.shtml

In addition to worldwide web posting, a text version of this notice
is clear-signed with the Cisco PSIRT PGP key and is posted to the
following e-mail and Usenet news recipients.

  * cust-security-announce@xxxxxxxxx
  * first-bulletins@xxxxxxxxxxxxxxx
  * bugtraq@xxxxxxxxxxxxxxxxx
  * vulnwatch@xxxxxxxxxxxxx
  * cisco@xxxxxxxxxxxxxxxxx
  * cisco-nsp@xxxxxxxxxxxxxxx
  * full-disclosure@xxxxxxxxxxxxxxxxx
  * comp.dcom.sys.cisco@xxxxxxxxxxxxxxxxxx

Future updates of this advisory, if any, will be placed on Cisco's
worldwide website, but may or may not be actively announced on
mailing lists or newsgroups. Users concerned about this problem are
encouraged to check the above URL for any updates.

Revision History
================

+------------------------------------------------------------+
| Revision 1.0 | 2011-September-28 | Initial public release. |
+------------------------------------------------------------+

Cisco Security Procedures
=========================

Complete information on reporting security vulnerabilities
in Cisco products, obtaining assistance with security
incidents, and registering to receive security information
from Cisco, is available on Cisco's worldwide website at
http://www.cisco.com/en/US/products/products_security_vulnerability_policy.html.
This includes instructions for press inquiries regarding
Cisco security notices. All Cisco security advisories are available at
http://www.cisco.com/go/psirt.

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