stream_engine.cpp in libzmq (aka ZeroMQ/C++)) 4.0.5 before 4.0.5 allows man-in-the-middle attackers to conduct downgrade attacks via a crafted connection request.
https://github.com/zeromq/libzmq/pull/1188
https://github.com/zeromq/libzmq/issues/1190
https://exchange.xforce.ibmcloud.com/vulnerabilities/96241
http://www.securityfocus.com/bid/70157
http://secunia.com/advisories/62262
http://seclists.org/oss-sec/2014/q3/776
http://seclists.org/oss-sec/2014/q3/754
http://lists.opensuse.org/opensuse-updates/2014-11/msg00101.html
http://lists.opensuse.org/opensuse-updates/2014-11/msg00027.html