Improper Certificate Validation Affecting twisted package, versions <18.9.0-7
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published7 Oct 2026
- disclosed16 Jun 2019
Introduced: 16 Jun 2019
CVE-2019-12855 (opens in a new tab)How to fix?
Upgrade Echo:latest twisted to version 18.9.0-7 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream twisted package and not the twisted package as distributed by Echo.
See How to fix? for Echo:latest relevant fixed versions and status.
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.
References
- https://advisory.echohq.com/cve/CVE-2019-12855
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PLTZDMFBNFSJMBXYJNGJHENJA4H2TSMZ/
- http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00013.html
- http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00028.html
- https://github.com/twisted/twisted/pull/1147
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PLTZDMFBNFSJMBXYJNGJHENJA4H2TSMZ/
- https://twistedmatrix.com/trac/ticket/9561
- https://usn.ubuntu.com/4308-1/
- https://usn.ubuntu.com/4308-2/
- https://www.oracle.com/security-alerts/cpuapr2020.html