Apache ActiveMQ before 5.6.0 allows remote attackers to cause a denial of service (file-descriptor exhaustion and broker crash or hang) by sending many openwire failover:tcp:// connection requests.
http://www.securityfocus.com/bid/50904
http://svn.apache.org/viewvc?view=revision&revision=1211844
http://svn.apache.org/viewvc?view=revision&revision=1209700
http://secunia.com/advisories/47112