Cisco Security Advisory – The Cisco IOS Software Network Address Translation functionality contains three denial of service (DoS) vulnerabilities. The first vulnerability is in the translation of Session Initiation Protocol (SIP) packets, the second vulnerability in the translation of H.323 packets and the third vulnerability is in the translation of H.225.0 call signaling for H.323 packets.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/94151/cisco-sa-20100922-nat.txt
Source: https://packetstormsecurity.com/files/94151/Cisco-Security-Advisory-20100922-nat.html