eEye SecureIIS versions 1.0.3 and earlier allows a remote attacker to bypass filtering of requests made to SecureIIS by escaping HTML characters within the request, which could allow a remote attacker to use restricted variables and perform directory traversal attacks on vulnerable programs that would otherwise be protected.
https://exchange.xforce.ibmcloud.com/vulnerabilities/6564
https://exchange.xforce.ibmcloud.com/vulnerabilities/6563
http://archives.neohapsis.com/archives/bugtraq/2001-05/0197.html