eEye SecureIIS versions 1.0.3 and earlier does not perform length checking on individual HTTP headers, which allows a remote attacker to send arbitrary length strings to IIS, contrary to an advertised feature of SecureIIS versions 1.0.3 and earlier.

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.