Cisco Security Advisory – A vulnerability exists in the Session Initiation Protocol (SIP) implementation in Cisco IOS Software that can be exploited remotely to cause a reload of the Cisco IOS device.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/76065/cisco-sa-20090325-sip.txt
Source: https://packetstormsecurity.com/files/76065/Cisco-Security-Advisory-20090325-sip.html