BEA Weblogic Server 8.1 through 8.1 SP4 does not properly validate client certificates when reusing cached connections, which allows remote attackers to obtain access via an untrusted X.509 certificate.
http://www.vupen.com/english/advisories/2007/0213
http://www.securityfocus.com/bid/22082
http://securitytracker.com/id?1017519