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Cisco Security Advisory: Cisco IOS XE Software NAT Denial of Service 
Vulnerability

Advisory ID:  cisco-sa-20160928-esp-nat

Revision: 1.0

For Public Release: 2016 September 28 16:00  GMT

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Summary
=======

A vulnerability in the implementation of Network Address Translation (NAT) 
functionality in Cisco IOS XE Software could allow an unauthenticated, remote 
attacker to cause an affected device to reload.

The vulnerability is due to improper handling of malformed ICMP packets by the 
affected software. An attacker could exploit this vulnerability by sending 
crafted ICMP packets that require NAT processing by an affected device. A 
successful exploit could allow the attacker to cause the device to reload, 
resulting in a denial of service (DoS) condition.

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

This advisory is available at the following link:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160928-esp-nat

This advisory is part of the September 28, 2016, release of the Cisco IOS and 
IOS XE Software Security Advisory Bundled Publication, which includes 10 Cisco 
Security Advisories that describe 11 vulnerabilities. All the vulnerabilities 
have a Security Impact Rating of High. For a complete list of the advisories 
and links to them, see Cisco Event Response: September 2016 Semiannual Cisco 
IOS and IOS XE Software Security Advisory Bundled Publication.

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