Apache Qpid 0.12 does not properly verify credentials during the joining of a cluster, which allows remote attackers to obtain access to the messaging functionality and job functionality of a cluster by leveraging knowledge of a cluster-username.
https://reviews.apache.org/r/2988/
https://issues.apache.org/jira/browse/QPID-3652
https://bugzilla.redhat.com/show_bug.cgi?id=747078