The MallocLite implementation in Cisco IOS 12.0, 12.2, 15.0, 15.1, and 15.2 allows remote attackers to cause a denial of service (Route Processor crash) via a BGP UPDATE message with a modified local-preference (aka LOCAL_PREF) attribute length, aka Bug ID CSCtq06538.
Improper Input Validation The product receives input or data, but it does
not validate or incorrectly validates that the input has the
properties that are required to process the data safely and
correctly.