The AMQP 0-8, 0-9, 0-91, and 0-10 connection handling in Apache Qpid Java before 6.0.3 might allow remote attackers to bypass authentication and consequently perform actions via vectors related to connection state logging.
http://www.securityfocus.com/archive/1/538508/100/0/threaded
http://packetstormsecurity.com/files/137216/Apache-Qpid-Java-Broker-6.0.2-Authentication-Bypass.html