CVE-2007-2688
The Cisco Intrusion Prevention System (IPS) and IOS with Firewall/IPS Feature Set do not properly handle certain full-width and half-width Unicode character encodings, which might allow remote attackers to evade detection of HTTP traffic.
Date published : 2007-05-15
http://www.securityfocus.com/bid/23980
http://www.securityfocus.com/archive/1/468633/100/0/threaded