The AMQP type decoder in Apache Qpid 0.20 and earlier allows remote attackers to cause a denial of service (memory consumption and server crash) via a large number of zero width elements in the client-properties map in a connection.start-ok message.
https://issues.apache.org/jira/browse/QPID-4629
https://bugzilla.redhat.com/show_bug.cgi?id=861234
http://svn.apache.org/viewvc?view=revision&revision=1453031
http://secunia.com/advisories/52516