Cisco Security Advisory – Two crafted Protocol Independent Multicast (PIM) packet vulnerabilities exist in Cisco IOS software that may lead to a denial of service (DoS) condition. Cisco has released free software updates that address these vulnerabilities. Workarounds that mitigate these vulnerabilities are available.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/70316/cisco-sa-20080924-multicast.txt
Source: https://packetstormsecurity.com/files/70316/Cisco-Security-Advisory-20080924-multicast.html