The Register: "In a strongly worded notice, Cisco warned: "The vulnerability can be exercised
repeatedly, affecting core routers, creating widespread network outages. This
vulnerability can only be exercised in configurations that include both BGP and
inbound route filtering on affected software."
Cisco is not aware of any malicious exploitation of the vulnerability and indeed it
seems doubtful whether s'kiddies have enough knowledge of esoteric routing
protocols to do much immediate harm."