Cisco Security Advisory – Devices that are running Cisco IOS Software and configured for Mobile IP Network Address Translation (NAT) Traversal feature or Mobile IPv6 are vulnerable to a denial of service (DoS) attack that may result in a blocked interface.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/76062/cisco-sa-20090325-mobileip.txt
Source: https://packetstormsecurity.com/files/76062/Cisco-Security-Advisory-20090325-mobileip.html