IRM Security Advisory 010 – A bug exists in the Top Layer Attack Mitigator IPS 5500 software. In versions below 3.11.014, it can cause the IPS 5500 device to incorrectly enter an overload protection mode and negatively impact network traffic. In extreme cases, this can cause a denial of service condition. More than 2,000 concurrent HTTP requests can cause this condition to occur.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/34167/IRM-010.txt
Source: https://packetstormsecurity.com/files/34167/IRM-Security-Advisory-10.html