The SERVICE.DNS signature engine in the Intrusion Prevention System (IPS) in Cisco IOS 12.3 and 12.4 allows remote attackers to cause a denial of service (device crash or hang) via network traffic that triggers unspecified IPS signatures, a different vulnerability than CVE-2008-1447.
http://secunia.com/advisories/31990
http://www.cisco.com/en/US/products/products_security_advisory09186a0080a01556.shtml