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Fencer Vulns
medium 6.5

CVE-2023-0430 json

Certificate OCSP revocation status was not checked when verifying S/Mime signatures.

published 2023-06-02 3 y ago modified 2026-10-24 15 d ago also EUVD-2023-12487

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

Certificate OCSP revocation status was not checked when verifying S/Mime signatures. Mail signed with a revoked certificate would be displayed as having a valid signature. Thunderbird versions from 68 to 102.7.0 were affected by this bug. This vulnerability affects Thunderbird < 102.7.1.

Patch / fix

  • Mozilla Thunderbird 102.7.1
  • thunderbird Debian 14, Debian 13, Debian 12 1:102.7.1+1-1

debian advisories DEBIAN-CVE-2023-0430

  • thunderbird RHEL 9 102.7.1-2.el9_1
  • thunderbird RHEL 8 102.7.1-2.el8_7
  • thunderbird RHEL 7 102.7.1-2.el7_9
  • thunderbird RHEL 8.4 EUS 102.7.1-2.el8_4
  • thunderbird RHEL 8.2 TUS, RHEL 8.2 E4S, RHEL 8.2 AUS 102.7.1-2.el8_2
  • thunderbird RHEL 9.0 EUS 102.7.1-2.el9_0
  • thunderbird RHEL 8.1 E4S 102.7.1-2.el8_1
  • thunderbird RHEL 8.6 EUS 102.7.1-2.el8_6

red hat advisories RHSA-2023:0608RHSA-2023:0603RHSA-2023:0606RHSA-2023:0602RHSA-2023:0607RHSA-2023:0601

  • MozillaThunderbird SLE Workstation Extension 15 SP4, SLE Module for Package Hub 15 SP4, openSUSE Leap 15.4 102.7.1-150200.8.102.1

suse advisories SUSE-SU-2023:0329-1

  • MozillaThunderbird openSUSE Tumbleweed 102.7.1-1.1

opensuse advisories openSUSE-SU-2024:12652-1

  • thunderbird AlmaLinux 8 102.7.1-2.el8_7.alma
  • thunderbird AlmaLinux 9 102.7.1-2.el9_1.alma

almalinux advisories ALSA-2023:0606ALSA-2023:0608

  • thunderbird Rocky Linux 9 102.7.1-2.el9_1
  • thunderbird Rocky Linux 8 102.7.1-2.el8_7

rocky linux advisories RLSA-2023:0608RLSA-2023:0606

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-2023-0430 updated cvss 7.5

Mozilla: Revocation status of S/Mime signature certificates was not checked

  • Red Hat Enterprise Linux 6 thunderbird
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 9 thunderbird-flatpak-container
    affected: no fix available
  • Red Hat Enterprise Linux AppStream (v. 8) thunderbird 102.7.1-2.el8_7
    fixed: vendor fix RHSA-2023:0606
  • Red Hat Enterprise Linux AppStream (v. 9) thunderbird 102.7.1-2.el9_1
    fixed: vendor fix RHSA-2023:0608
  • Red Hat Enterprise Linux AppStream AUS (v. 8.2) thunderbird 102.7.1-2.el8_2
    fixed: vendor fix RHSA-2023:0602
  • Red Hat Enterprise Linux AppStream E4S (v. 8.1) thunderbird 102.7.1-2.el8_1
    fixed: vendor fix RHSA-2023:0601
  • Red Hat Enterprise Linux AppStream E4S (v. 8.2) thunderbird 102.7.1-2.el8_2
    fixed: vendor fix RHSA-2023:0602
  • Red Hat Enterprise Linux AppStream EUS (v.8.4) thunderbird 102.7.1-2.el8_4
    fixed: vendor fix RHSA-2023:0603
show 4 more
  • Red Hat Enterprise Linux AppStream EUS (v.8.6) thunderbird 102.7.1-2.el8_6
    fixed: vendor fix RHSA-2023:0605
  • Red Hat Enterprise Linux AppStream EUS (v.9.0) thunderbird 102.7.1-2.el9_0
    fixed: vendor fix RHSA-2023:0607
  • Red Hat Enterprise Linux AppStream TUS (v. 8.2) thunderbird 102.7.1-2.el8_2
    fixed: vendor fix RHSA-2023:0602
  • Red Hat Enterprise Linux Client (v. 7) thunderbird 102.7.1-2.el7_9 Red Hat Enterprise Linux Server Optional (v. 7) thunderbird 102.7.1-2.el7_9 Red Hat Enterprise Linux Workstation (v. 7) thunderbird 102.7.1-2.el7_9
    fixed: vendor fix RHSA-2023:0600

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
Proof of concept is public
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).

Exploits and checks

  • bugzilla.mozilla.org https://bugzilla.mozilla.org/show_bug.cgi?id=1769000 referenced PoC, tagged "exploit" by a source, unverified

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.