Vulnerabilities
Misconfiguration
Compliance
Cryptography
CVE Vulnerabilities

CVE-2019-12855

Improper Certificate Validation

Published: Jun 16, 2019 | Modified: Jun 17, 2026
CVSS 3.x
7.4
HIGH
Source:
NVD
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CVSS 2.x
5.8 MEDIUM
AV:N/AC:M/Au:N/C:P/I:P/A:N
RedHat/V2
RedHat/V3
7.4 MODERATE
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Ubuntu
LOW
Vulnerability-free packages from our partners
Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2019-12855
CWEhttps://cwe.mitre.org/data/definitions/295.html

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.

Weakness

The product does not validate, or incorrectly validates, a certificate.

Affected Software

NameVendorStart VersionEnd Version
TwistedTwisted*19.2.1 (including)
TwistedUbuntubionic*
TwistedUbuntucosmic*
TwistedUbuntudevel*
TwistedUbuntudisco*
TwistedUbuntueoan*
TwistedUbuntuesm-infra-legacy/trusty*
TwistedUbuntuesm-infra-legacy/xenial*
TwistedUbuntuesm-infra/bionic*
TwistedUbuntuesm-infra/xenial*
TwistedUbuntutrusty*
TwistedUbuntutrusty/esm*
TwistedUbuntuxenial*
Twisted-py3Ubuntutrusty*

Potential Mitigations

References

Aqua Security is the largest pure-play cloud native security company, providing customers the freedom to innovate and run their businesses with minimal friction. The Aqua Cloud Native Security Platform provides prevention, detection, and response automation across the entire application lifecycle to secure the build, secure cloud infrastructure and secure running workloads wherever they are deployed.
Copyright © 2026 Aqua Security Software Ltd.   Privacy Policy | Terms of Use