Nortel VPN Router (aka Contivity) allows remote attackers to cause a denial of service (crash) via an IPsec IKE packet with a malformed ISAKMP header.Referenceshttp://securitytracker.com/id?1014068http://www.securityfocus.com/bid/13792http://www.nta-monitor.com/news/vpn-flaws/nortel/vpn-router-dos/http://www.securityfocus.com/archive/1/399423
