Cisco Security Advisory: Cisco Unified Communications Manager CAPF Denial of Service Vulnerability
URL : http://www.cisco.com/en/US/products/products_security_advisory09186a0080a61928.shtml

Summary

Cisco Unified Communications Manager, formerly Cisco CallManager, contains a denial of service (DoS) vulnerability in the Certificate Authority Proxy Function (CAPF) service. Exploitation of this vulnerability could cause an interruption in voice services. The CAPF service is disabled by default.

Cisco has released free software updates that address this vulnerability. Workarounds available that mitigate this vulnerability are available.

This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20090121-cucmcapf.shtml.