What’s Vulnerable › Vulnerabilities

CVE-2019-12855

• Severity: high (CVSS 7.4 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-06-16 · updated 2026-06-17
• Weakness: CWE-295

Description

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 products

• twisted: through 19.2.1

References

• 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
• 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/

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