Internet Key Exchange (IKE) version 1 protocol, as implemented on Cisco IOS, VPN 3000 Concentrators, and PIX firewalls, allows remote attackers to cause a denial of service (resource exhaustion) via a flood of IKE Phase-1 packets that exceed the session expiration rate. NOTE: it has been argued that this is due to a design weakness of the IKE version 1 protocol, in which case other vendors and implementations would also be affected.
archives.neohapsis.com/archives/bugtraq/2006-07/0531.html
securityreason.com/securityalert/1293
securitytracker.com/id?1016582
www.cisco.com/en/US/tech/tk583/tk372/tsd_technology_security_response09186a00806f33d4.html
www.nta-monitor.com/posts/2006/07/cisco-concentrator-dos.html
www.osvdb.org/29068
www.securityfocus.com/archive/1/441203/100/0/threaded
www.securityfocus.com/bid/19176
exchange.xforce.ibmcloud.com/vulnerabilities/27972
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5299