libzmq (aka ZeroMQ/C++) 4.0.x before 4.0.5 does not ensure that nonces are unique, which allows man-in-the-middle attackers to conduct replay attacks via unspecified vectors.
https://github.com/zeromq/libzmq/pull/1189
https://github.com/zeromq/libzmq/issues/1191
https://exchange.xforce.ibmcloud.com/vulnerabilities/96242
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