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.Referenceshttps://twistedmatrix.com/trac/ticket/9561https://github.com/twisted/twisted/pull/1147https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PLTZDMFBNFSJMBXYJNGJHENJA4H2TSMZ/http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00013.htmlhttp://lists.opensuse.org/opensuse-security-announce/2019-09/msg00028.htmlhttps://usn.ubuntu.com/4308-2/https://usn.ubuntu.com/4308-1/https://www.oracle.com/security-alerts/cpuapr2020.html
