They've been discussing the existence of a new Cisco IOS attack on the NANOG mailing list (see http://www.merit.edu/mail.archives/nanog/ for details)
According to what I've been reading it's a remotely exploitable denial of service situation, based on specially crafted packets designed to fill up the "process switched" input queues on an interface. It seemingly will cause the router to crash or reboot. I have no further details. Len _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.netsys.com/full-disclosure-charter.html