CVE-2019-12855

mediumpriority · track · 31EPSS 0.018 · 78 %ileEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.81% (78th) EPSS

CVSS 5.8 · medium

Is it mine?

26 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · osv

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

7.4

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5.8–7.4

v2.05.8mediumAV:N/AC:M/Au:N/C:P/I:P/A:Nprimary · NVD / NIST USexploitability 8.6 · impact 4.9

v3.07.4highCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:Nprimary · NVD / NIST USexploitability 2.2 · impact 5.2

v3.07.4highCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:Nsecondary · OSV

v3.06.8mediumCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N/E:Usecondary · CVSS-BT (t0sche)

v3.17.4highAV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:Nsecondary · FSTEC (BDU) RU

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-295USprimaryCWE-295USCWE-295US

affected products (26)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
Canonical Ltd. Ubuntu≤ 18.04 LTSfstec_bduRU
Canonical Ltd. Ubuntu≤ 16.04 LTSfstec_bduRU
Canonical Ltd. Ubuntu≤ 19.10fstec_bduRU
Canonical Ltd. Ubuntu≤ 14.04 ESMfstec_bduRU
Glyph Lefkowitz Twisted≤ 19.2.1fstec_bduRU
Novell Inc. HPE Helion Openstack≤ 8fstec_bduRU
Novell Inc. OpenSUSE Leap≤ 15.0fstec_bduRU
Novell Inc. OpenSUSE Leap≤ 15.1fstec_bduRU
Novell Inc. SUSE Enterprise Storage≤ 5fstec_bduRU
Novell Inc. SUSE Enterprise Storage≤ 4fstec_bduRU
Novell Inc. SUSE Linux Enterprise Build System Kit≤ 12 SP4fstec_bduRU
Novell Inc. SUSE Linux Enterprise Module for Open Buildservice Development Tools≤ 15fstec_bduRU
Novell Inc. SUSE Linux Enterprise Module for Open Buildservice Development Tools≤ 15 SP1fstec_bduRU
Novell Inc. SUSE Linux Enterprise Module for Web Scripting≤ 12fstec_bduRU
Novell Inc. SUSE OpenStack Cloud≤ 7fstec_bduRU
Novell Inc. SUSE OpenStack Cloud≤ 8fstec_bduRU
Novell Inc. SUSE OpenStack Cloud≤ 9fstec_bduRU
Novell Inc. SUSE OpenStack Cloud Crowbar≤ 9fstec_bduRU
Novell Inc. SUSE OpenStack Cloud Crowbar≤ 8fstec_bduRU

showing 20 of 26

advisories (2)

Vendor and ecosystem advisories describing this.

GHSA-65rm-h285-5cc5Improper Certificate Validation in Twisted2019-08-16ghsa · osvUS
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.
PYSEC-2019-1292019-06-16vendor · osvUS
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.

also known as (7)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu osv NVD CVE.org MITRE

published 2019-06-16modified 2026-06-17

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+1889 more

references (27)

External citations — patches, advisories, analysis.

scry

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