Cisco IOS IPS Denial of Service Vulnerability

[robocisco]

The Cisco IOS Intrusion Prevention System (IPS) feature contains a vulnerability in the processing of certain IPS signatures that use the SERVICE.DNS engine. This vulnerability may cause a router to crash or hang, resulting in a denial of service condition.

More... (http://www.cisco.com/en/US/products/products_security_advisory09186a0080a01556.shtml)