CVE-2007-0917
The Intrusion Prevention System (IPS) feature for Cisco IOS 12.4XE to 12.3T allows remote attackers to bypass IPS signatures that use regular expressions via fragmented packets.
Date published : 2007-02-13
http://www.securityfocus.com/bid/22549
http://www.cisco.com/en/US/products/products_security_advisory09186a00807e0a5b.shtml