{"id":"UBUNTU-CVE-2019-12855","details":"In words.protocols.jabber.xmlstream in Twisted through 19.2.1, XMPP support did not verify certificates when used with TLS, allowing an attacker to MITM connections.","modified":"2026-02-04T03:04:14.139724Z","published":"2019-06-16T12:29:00Z","related":["USN-4308-1","USN-4308-2"],"upstream":["CVE-2019-12855"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2019-12855"},{"type":"REPORT","url":"https://github.com/twisted/twisted/pull/1147"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4308-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4308-2"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2019-12855"}],"affected":[{"package":{"name":"twisted","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/twisted@13.2.0-1ubuntu1.2+esm1?arch=source&distro=trusty/esm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"13.2.0-1ubuntu1.2+esm1"}]}],"versions":["13.0.0-1ubuntu1","13.2.0-1ubuntu1","13.2.0-1ubuntu1.2"],"ecosystem_specific":{"binaries":[{"binary_version":"13.2.0-1ubuntu1.2+esm1","binary_name":"python-twisted"},{"binary_version":"13.2.0-1ubuntu1.2+esm1","binary_name":"python-twisted-bin"},{"binary_version":"1:13.2.0-1ubuntu1.2+esm1","binary_name":"python-twisted-conch"},{"binary_version":"13.2.0-1ubuntu1.2+esm1","binary_name":"python-twisted-core"},{"binary_version":"13.2.0-1ubuntu1.2+esm1","binary_name":"python-twisted-lore"},{"binary_version":"13.2.0-1ubuntu1.2+esm1","binary_name":"python-twisted-mail"},{"binary_version":"13.2.0-1ubuntu1.2+esm1","binary_name":"python-twisted-names"},{"binary_version":"13.2.0-1ubuntu1.2+esm1","binary_name":"python-twisted-news"},{"binary_version":"13.2.0-1ubuntu1.2+esm1","binary_name":"python-twisted-runner"},{"binary_version":"13.2.0-1ubuntu1.2+esm1","binary_name":"python-twisted-web"},{"binary_version":"13.2.0-1ubuntu1.2+esm1","binary_name":"python-twisted-words"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-12855.json"}},{"package":{"name":"twisted","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/twisted@16.0.0-1ubuntu0.4?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"16.0.0-1ubuntu0.4"}]}],"versions":["15.2.1-1ubuntu2","15.5.0-1","15.5.0-2","15.5.0-2ubuntu1","15.5.0-4","16.0.0~pre1-1","16.0.0~pre1-1ubuntu1","16.0.0~pre1-2ubuntu1","16.0.0~pre1-3","16.0.0-1","16.0.0-1ubuntu0.2"],"ecosystem_specific":{"binaries":[{"binary_version":"16.0.0-1ubuntu0.4","binary_name":"python-twisted"},{"binary_version":"16.0.0-1ubuntu0.4","binary_name":"python-twisted-bin"},{"binary_version":"1:16.0.0-1ubuntu0.4","binary_name":"python-twisted-conch"},{"binary_version":"16.0.0-1ubuntu0.4","binary_name":"python-twisted-core"},{"binary_version":"16.0.0-1ubuntu0.4","binary_name":"python-twisted-mail"},{"binary_version":"16.0.0-1ubuntu0.4","binary_name":"python-twisted-names"},{"binary_version":"16.0.0-1ubuntu0.4","binary_name":"python-twisted-news"},{"binary_version":"16.0.0-1ubuntu0.4","binary_name":"python-twisted-runner"},{"binary_version":"16.0.0-1ubuntu0.4","binary_name":"python-twisted-web"},{"binary_version":"16.0.0-1ubuntu0.4","binary_name":"python-twisted-words"},{"binary_version":"16.0.0-1ubuntu0.4","binary_name":"python3-twisted"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-12855.json"}},{"package":{"name":"twisted","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/twisted@17.9.0-2ubuntu0.1?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"17.9.0-2ubuntu0.1"}]}],"versions":["16.6.0-2ubuntu3","17.9.0-1","17.9.0-2"],"ecosystem_specific":{"binaries":[{"binary_version":"17.9.0-2ubuntu0.1","binary_name":"python-twisted"},{"binary_version":"17.9.0-2ubuntu0.1","binary_name":"python-twisted-bin"},{"binary_version":"1:17.9.0-2ubuntu0.1","binary_name":"python-twisted-conch"},{"binary_version":"17.9.0-2ubuntu0.1","binary_name":"python-twisted-core"},{"binary_version":"17.9.0-2ubuntu0.1","binary_name":"python-twisted-mail"},{"binary_version":"17.9.0-2ubuntu0.1","binary_name":"python-twisted-names"},{"binary_version":"17.9.0-2ubuntu0.1","binary_name":"python-twisted-news"},{"binary_version":"17.9.0-2ubuntu0.1","binary_name":"python-twisted-runner"},{"binary_version":"17.9.0-2ubuntu0.1","binary_name":"python-twisted-web"},{"binary_version":"17.9.0-2ubuntu0.1","binary_name":"python-twisted-words"},{"binary_version":"17.9.0-2ubuntu0.1","binary_name":"python3-twisted"},{"binary_version":"17.9.0-2ubuntu0.1","binary_name":"python3-twisted-bin"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-12855.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"},{"type":"Ubuntu","score":"low"}]}