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Fencer Vulns
medium 6.5

CVE-2023-0547 json

OCSP revocation status of recipient certificates was not checked when sending S/Mime encrypted email, and revoked certificates would be acc…

published 2023-06-02 3 y ago modified 2026-10-23 16 d ago also EUVD-2023-12592

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 31%
public exploits
0
none known

Summary

OCSP revocation status of recipient certificates was not checked when sending S/Mime encrypted email, and revoked certificates would be accepted. Thunderbird versions from 68 to 102.9.1 were affected by this bug. This vulnerability affects Thunderbird < 102.10.

Patch / fix

  • Mozilla Thunderbird 102.10
  • thunderbird Debian 14, Debian 13, Debian 12 1:102.10.0-1

debian advisories DEBIAN-CVE-2023-0547

  • thunderbird Ubuntu 18.04 LTS 1:102.10.0+build2-0ubuntu0.18.04.1
  • thunderbird Ubuntu 20.04 LTS 1:102.10.0+build2-0ubuntu0.20.04.1
  • thunderbird Ubuntu 22.04 LTS 1:102.10.0+build2-0ubuntu0.22.04.1

ubuntu advisories UBUNTU-CVE-2023-0547

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 8 102.10.0-2.el8_7
  • thunderbird RHEL 9 102.10.0-2.el9_1
  • thunderbird RHEL 7 102.10.0-2.el7_9
  • thunderbird RHEL 8.1 E4S 102.10.0-2.el8_1
  • thunderbird RHEL 9.0 EUS 102.10.0-2.el9_0
  • thunderbird RHEL 8.6 EUS 102.10.0-2.el8_6
  • thunderbird RHEL 8.4 EUS 102.10.0-2.el8_4
  • thunderbird RHEL 8.2 TUS, RHEL 8.2 E4S, RHEL 8.2 AUS 102.10.0-2.el8_2

red hat advisories RHSA-2023:1802RHSA-2023:1803RHSA-2023:1809RHSA-2023:1810RHSA-2023:1811RHSA-2023:1804

  • MozillaThunderbird SLE Workstation Extension 15 SP4, SLE Module for Package Hub 15 SP4, openSUSE Leap 15.4 102.10.1-150200.8.113.2

suse advisories SUSE-SU-2023:2064-1

  • MozillaThunderbird openSUSE Tumbleweed 102.10.0-1.1

opensuse advisories openSUSE-SU-2024:12852-1

  • thunderbird AlmaLinux 8 102.10.0-2.el8_7.alma
  • thunderbird AlmaLinux 9 102.10.0-2.el9_1.alma

almalinux advisories ALSA-2023:1802ALSA-2023:1809

  • thunderbird Rocky Linux 9 102.10.0-2.el9_1
  • thunderbird Rocky Linux 8 102.10.0-2.el8_7

rocky linux advisories RLSA-2023:1809RLSA-2023:1802

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-2023-0547 updated cvss 7.5

Thunderbird: Revocation status of S/Mime recipient certificates was not checked

  • Red Hat Enterprise Linux 6 thunderbird
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 8) thunderbird 102.10.0-2.el8_7
    fixed: vendor fix RHSA-2023:1802
  • Red Hat Enterprise Linux AppStream (v. 9) thunderbird 102.10.0-2.el9_1
    fixed: vendor fix RHSA-2023:1809
  • Red Hat Enterprise Linux AppStream AUS (v. 8.2) thunderbird 102.10.0-2.el8_2
    fixed: vendor fix RHSA-2023:1805
  • Red Hat Enterprise Linux AppStream E4S (v. 8.1) thunderbird 102.10.0-2.el8_1
    fixed: vendor fix RHSA-2023:1803
  • Red Hat Enterprise Linux AppStream E4S (v. 8.2) thunderbird 102.10.0-2.el8_2
    fixed: vendor fix RHSA-2023:1805
  • Red Hat Enterprise Linux AppStream EUS (v.8.4) thunderbird 102.10.0-2.el8_4
    fixed: vendor fix RHSA-2023:1804
  • Red Hat Enterprise Linux AppStream EUS (v.8.6) thunderbird 102.10.0-2.el8_6
    fixed: vendor fix RHSA-2023:1811
show 3 more
  • Red Hat Enterprise Linux AppStream EUS (v.9.0) thunderbird 102.10.0-2.el9_0
    fixed: vendor fix RHSA-2023:1810
  • Red Hat Enterprise Linux AppStream TUS (v. 8.2) thunderbird 102.10.0-2.el8_2
    fixed: vendor fix RHSA-2023:1805
  • Red Hat Enterprise Linux Client (v. 7) thunderbird 102.10.0-2.el7_9 Red Hat Enterprise Linux Server Optional (v. 7) thunderbird 102.10.0-2.el7_9 Red Hat Enterprise Linux Workstation (v. 7) thunderbird 102.10.0-2.el7_9
    fixed: vendor fix RHSA-2023:1806

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

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
21 mo ago

Exploit prediction

0.37% chance of exploitation in the next 30 days, higher than 31% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Affected products

  • Mozilla Thunderbird

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.