The cluster cookie parsing code in BEA WebLogic Server 7.0 through Service Pack 5 attempts to contact any host or port specified in a cookie, even when it is not in the cluster, which allows remote attackers to cause a denial of service (cluster slowdown) via modified cookies.
http://www.vupen.com/english/advisories/2005/0606
http://www.securityfocus.com/bid/13717
http://securitytracker.com/id?1014049