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Fencer Vulns
high 7.4

CVE-2019-12855 json

Improper Certificate Validation in Twisted

published 2019-06-16 7 y ago modified 2026-06-17 4 mo ago also GHSA-65rm-h285-5cc5 , PYSEC-2019-129 , EUVD-2019-0147

cvss
7.4
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.8%
EPSS 1.8% chance of exploitation in 30 days, percentile 78%
public exploits
0
none known

Summary

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.

Patch / fix

  • pypi twisted 19.7.0rc1
  • twisted Debian 14, Debian 13, Debian 12 18.9.0-7

debian advisories DEBIAN-CVE-2019-12855

  • twisted Ubuntu 16.04 LTS 16.0.0-1ubuntu0.4
  • twisted Ubuntu 18.04 LTS 17.9.0-2ubuntu0.1
  • twisted Ubuntu Pro 14.04 LTS 13.2.0-1ubuntu1.2+esm1

ubuntu advisories UBUNTU-CVE-2019-12855

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • python-Twisted SLE Module for Web and Scripting 12, OpenStack Cloud Crowbar 9, OpenStack Cloud Crowbar 8 +6 more 15.2.1-9.8.1

suse advisories SUSE-SU-2019:2453-1

  • python-Twisted openSUSE Tumbleweed 21.7.0-3.2
  • python-Twisted Package Hub 15 17.9.0-bp150.4.6.1
  • python-Twisted openSUSE Leap 15.1, openSUSE Leap 15.0 17.9.0-lp151.3.6.1

opensuse advisories openSUSE-SU-2024:11212-1openSUSE-SU-2019:2110-1openSUSE-SU-2019:2068-1

  • py3-twisted Alpine 3.24, Alpine 3.23, Alpine 3.22 +11 more 19.7.0-r0

alpine advisories ALPINE-CVE-2019-12855

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • python-twisted CBL-Mariner 2.0 22.2.0-1

azure linux advisories AZL-6818

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2019-12855 updated cvss 7.4

python-twisted: XMPP support in words.protocols.jabber.xmlstream in Twisted does not verify certificates allowing for a MITM connections

  • Red Hat Ceph Storage 2 calamari-server
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux 6 python-twisted-words
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 python-twisted-words Red Hat OpenStack Platform 9 (Mitaka) python-twisted Red Hat OpenStack Platform 9 (Mitaka) Operational Tools python-twisted Red Hat OpenStack Platform 10 (Newton) python-twisted Red Hat OpenStack Platform 13 (Queens) python-twisted
    affected: no fix planned “Will not fix”
  • Red Hat OpenStack Platform 14 (Rocky) python-twisted
    affected: no fix planned “Out of support scope”
  • Red Hat Ceph Storage 2 python-twisted-core Red Hat Ceph Storage 3 python-twisted-core Red Hat Storage 3 python-twisted-core
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.81% chance of exploitation in the next 30 days, higher than 78% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 7.4 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
NVD 2.0 5.8 AV:N/AC:M/Au:N/C:P/I:P/A:N
GitHub 3.0 7.4 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected packages

ecosystem package affected fixed in
pypi twisted
<19.7.0rc1
19.7.0rc1

Classification

Weakness
  • CWE-295 Improper Certificate Validation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.