Cisco Security Advisory 20040408 – A malformed Internet Key Exchange (IKE) packet may cause the Cisco Catalyst 6500 Series Switch or the Cisco 7600 Series Internet Router hardware, with the VPNSM installed, to crash and reload.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/33038/cisco-sa-20040408-vpnsm.txt
Source: https://packetstormsecurity.com/files/33038/Cisco-Security-Advisory-20040408-vpnsm.html