Cisco Security Advisory: Cisco IOS and IOS XE Software Internet Key Exchange Version 2 Fragmentation Denial of Service Vulnerability

[Cisco Systems Product Security Incident Response Team <psirt@xxxxxxxxx>]

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Cisco Security Advisory: Cisco IOS and IOS XE Software Internet Key Exchange 
Version 2 Fragmentation Denial of Service Vulnerability

Advisory ID: cisco-sa-20160323-ios-ikev2

Revision 1.0

For Public Release 2016 March 23 16:00  GMT

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Summary
=======

A vulnerability in the Internet Key Exchange (IKE) version 2 (v2) fragmentation 
code of Cisco IOS and IOS XE Software could allow an unauthenticated, remote 
attacker to cause a reload of the affected system. 

The vulnerability is due to an improper handling of crafted, fragmented IKEv2 
packets. An attacker could exploit this vulnerability by sending crafted UDP 
packets to the affected system. An exploit could allow the attacker to cause a 
reload of the affected system.

Note: Only traffic directed to the affected system can be used to exploit this 
vulnerability. This vulnerability can be triggered by IPv4 and IPv6 traffic.

Cisco has released software updates that address this vulnerability. This 
advisory is available at the following link:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160323-ios-ikev2

This advisory is part of the March 23, 2016, release of the Cisco IOS and IOS 
XE Software Security Advisory Bundled Publication, which includes six Cisco 
Security Advisories that describe six vulnerabilities. All the vulnerabilities 
have a Security Impact Rating of "High." For a complete list of advisories and 
links to them, see Cisco Event Response:
http://www.cisco.com/c/en/us/about/security-center/event-response/cisco-erp-march-2016.html

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