Improper Certificate Validation in Twisted
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.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | twisted | < 19.7.0rc1 | 19.7.0rc1 |
References
- https://twistedmatrix.com/trac/ticket/9561
- https://github.com/twisted/twisted/pull/1147
- 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://usn.ubuntu.com/4308-1/
- https://usn.ubuntu.com/4308-2/
- https://www.oracle.com/security-alerts/cpuapr2020.html
- https://github.com/advisories/GHSA-65rm-h285-5cc5
- https://nvd.nist.gov/vuln/detail/CVE-2019-12855
- https://github.com/pypa/advisory-database/tree/main/vulns/twisted/PYSEC-2019-129.yaml
- https://github.com/twisted/twisted
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PLTZDMFBNFSJMBXYJNGJHENJA4H2TSMZ
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PLTZDMFBNFSJMBXYJNGJHENJA4H2TSMZ
- https://usn.ubuntu.com/4308-1
- https://usn.ubuntu.com/4308-2
- CVSS vector
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N- Weakness (CWE)
CWE-295- Platform
- Python (PyPI)
- Package
twisted- Disclosed
- 16.06.2019
- Updated
- 11.10.2026 12:18
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2019-129 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-65rm-h285-5cc5 - CC BY 4.0
Vulnerability history: twisted
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 17
- First → latest
- 06.2019 10.2026
- Without a fix
- 1
- Exploited in attacks
- 0
Severity breakdown
- Critical 5
- High 4
- Medium 8
Disclosures per year
- 2019: 3
- 2020: 3
- 2021: 0
- 2022: 6
- 2023: 1
- 2024: 2
- 2025: 0
- 2026: 2
-
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