Cisco Security Advisory – Cisco Intrusion Prevention System (IPS) software version 5.1 is vulnerable to a denial of service condition caused by a malformed packet, which may result in an IPS device becoming inaccessible remotely or via the console and fail to process packets. A power reset is required to recover the IPS device. There are no workarounds for this vulnerability. Cisco Intrusion Prevention System 42xx appliances running IPS software versions 5.1(1), 5.1(1a), 5.1(1b), 5.1(1c), 5.1(1d), 5.1(1e) or 5.1(p1) are affected.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/48236/cisco-sa-20060712-ips.txt
Source: https://packetstormsecurity.com/files/48236/Cisco-Security-Advisory-20060712-ips.html