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Fencer Vulns
medium 6.5

CVE-2019-11739 json

Encrypted S/MIME parts in a crafted multipart/alternative message can leak plaintext when included in a a HTML reply/forward.

published 2019-09-27 7 y ago modified 2026-06-17 4 mo ago also EUVD-2019-3409

cvss
6.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.9%
EPSS 0.9% chance of exploitation in 30 days, percentile 60%
public exploits
0
none known

Summary

Encrypted S/MIME parts in a crafted multipart/alternative message can leak plaintext when included in a a HTML reply/forward. This vulnerability affects Thunderbird < 68.1 and Thunderbird < 60.9.

Patch / fix

  • Mozilla Thunderbird 60.9, 68.1
  • thunderbird Debian 14, Debian 13, Debian 12 1:60.9.0-1

debian advisories DEBIAN-CVE-2019-11739

  • thunderbird Ubuntu 16.04 LTS 1:60.9.0+build1-0ubuntu0.16.04.2
  • thunderbird Ubuntu 18.04 LTS 1:60.9.0+build1-0ubuntu0.18.04.1

ubuntu advisories UBUNTU-CVE-2019-11739

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

  • thunderbird RHEL 8 60.9.0-2.el8_0
  • thunderbird RHEL 7 60.9.0-1.el7_7
  • thunderbird RHEL 6 60.9.0-1.el6_10

red hat advisories RHSA-2019:2774RHSA-2019:2773RHSA-2019:2807

  • MozillaThunderbird SLE Workstation Extension 15 SP1, SLE Workstation Extension 15 68.1.1-3.51.1

suse advisories SUSE-SU-2019:2515-1

  • MozillaThunderbird openSUSE Tumbleweed 91.1.1-1.1
  • MozillaThunderbird openSUSE Leap 15.1 68.1.1-lp151.2.13.1
  • enigmail openSUSE Leap 15.1 2.1.2-lp151.2.6.1
  • MozillaThunderbird openSUSE Leap 15.0 68.1.1-lp150.3.51.1
  • enigmail openSUSE Leap 15.0 2.1.2-lp150.34.1

opensuse advisories openSUSE-SU-2024:10601-1openSUSE-SU-2019:2249-1openSUSE-SU-2019:2248-1

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-2019-11739 updated cvss 6.5

Mozilla: Covert Content Attack on S/MIME encryption using a crafted multipart/alternative message

  • Red Hat Enterprise Linux 5 thunderbird
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 8) thunderbird 60.9.0-2.el8_0
    fixed: vendor fix RHSA-2019:2774
  • Red Hat Enterprise Linux Client (v. 7) thunderbird 60.9.0-1.el7_7
    fixed: vendor fix RHSA-2019:2773
  • Red Hat Enterprise Linux Desktop (v. 6) thunderbird 60.9.0-1.el6_10 Red Hat Enterprise Linux Server Optional (v. 6) thunderbird 60.9.0-1.el6_10
    fixed: vendor fix RHSA-2019:2807
  • Red Hat Enterprise Linux Server Optional (v. 7) thunderbird 60.9.0-1.el7_7
    fixed: vendor fix RHSA-2019:2773
  • Red Hat Enterprise Linux Workstation (v. 6) thunderbird 60.9.0-1.el6_10
    fixed: vendor fix RHSA-2019:2807
  • Red Hat Enterprise Linux Workstation (v. 7) thunderbird 60.9.0-1.el7_7
    fixed: vendor fix RHSA-2019:2773

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

0.91% chance of exploitation in the next 30 days, higher than 60% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:P/I:N/A:N

Affected products

  • Mozilla Thunderbird

Classification

Weakness
  • CWE-319 Cleartext Transmission of Sensitive Information

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.