{"id":"UBUNTU-CVE-2014-9721","details":"libzmq before 4.0.6 and 4.1.x before 4.1.1 allows remote attackers to conduct downgrade attacks and bypass ZMTP v3 protocol security mechanisms via a ZMTP v2 or earlier header.","modified":"2025-09-08T16:43:16Z","published":"2015-06-03T20:59:00Z","upstream":["CVE-2014-9721"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2014-9721"},{"type":"REPORT","url":"https://github.com/zeromq/libzmq/issues/1273"},{"type":"REPORT","url":"https://github.com/zeromq/zeromq4-x/commit/b6e3e0f601e2c1ec1f3aac880ed6a3fe63043e51"},{"type":"REPORT","url":"http://www.openwall.com/lists/oss-security/2015/05/07/8"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2014-9721"}],"affected":[{"package":{"name":"zeromq3","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/zeromq3@4.0.4+dfsg-2ubuntu0.1?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.0.4+dfsg-2ubuntu0.1"}]}],"versions":["3.2.3+dfsg-2","3.2.4+dfsg-1","3.2.4+dfsg-2","3.2.4+dfsg-3","3.2.4+dfsg-4","4.0.3+dfsg-1","4.0.4+dfsg-2"],"ecosystem_specific":{"binaries":[{"binary_version":"4.0.4+dfsg-2ubuntu0.1","binary_name":"libzmq3"},{"binary_version":"4.0.4+dfsg-2ubuntu0.1","binary_name":"libzmq3-dev"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2014/UBUNTU-CVE-2014-9721.json"}}],"schema_version":"1.7.3","severity":[{"type":"Ubuntu","score":"medium"}]}