Cisco Malformed HSRP Traffic Denial of Service Vulnerability

IOS is the Internet Operating System, used on Cisco routers. It is distributed and maintained by Cisco. Hot Standby Routing Protocol (HSRP) is a protocol used to allow multiple routers to dynamically act as backups in the event of router failure. HSRP traffic takes place over UDP port 1985.

A vulnerability has been reported with some Cisco products. If malformed HSRP traffic is received when HSRP support is not enabled, vulnerable products may reach high CPU utilization. Under these conditions, the router may fail to respond to additional network traffic, resulting in degraded performance and a denial of service condition.


Privacy Statement
Copyright 2010, SecurityFocus