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Fencer Vulns
high 8.8

CVE-2022-40962 json

Mozilla developers Nika Layzell, Timothy Nikkel, Sebastian Hengst, Andreas Pehrson, and the Mozilla Fuzzing Team reported memory safety bug…

published 2022-12-22 3 y ago modified 2026-06-17 4 mo ago also EUVD-2022-44208

cvss
8.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.4%
EPSS 1.4% chance of exploitation in 30 days, percentile 73%
public exploits
0
none known

Summary

Mozilla developers Nika Layzell, Timothy Nikkel, Sebastian Hengst, Andreas Pehrson, and the Mozilla Fuzzing Team reported memory safety bugs present in Firefox 104 and Firefox ESR 102.2. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox ESR < 102.3, Thunderbird < 102.3, and Firefox < 105.

Patch / fix

  • Mozilla Firefox ESR 102.3
  • Mozilla Thunderbird 102.3
  • Mozilla Firefox 105
  • firefox-esr Debian 14, Debian 13, Debian 12 102.3.0esr-1
  • thunderbird Debian 14, Debian 13, Debian 12 1:102.3.0-1

debian advisories DEBIAN-CVE-2022-40962

  • firefox Ubuntu 18.04 LTS 105.0+build2-0ubuntu0.18.04.1
  • firefox Ubuntu 20.04 LTS 105.0+build2-0ubuntu0.20.04.1
  • thunderbird Ubuntu 18.04 LTS 1:102.4.2+build2-0ubuntu0.18.04.1
  • thunderbird Ubuntu 20.04 LTS 1:102.4.2+build2-0ubuntu0.20.04.1
  • thunderbird Ubuntu 22.04 LTS 1:102.4.2+build2-0ubuntu0.22.04.1

ubuntu advisories UBUNTU-CVE-2022-40962

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 7 102.3.0-3.el7_9
  • thunderbird RHEL 9 102.3.0-3.el9_0
  • thunderbird RHEL 8 102.3.0-3.el8_6
  • firefox RHEL 8 102.3.0-6.el8_6
  • firefox RHEL 9 102.3.0-6.el9_0
  • firefox RHEL 7 102.3.0-6.el7_9
  • thunderbird RHEL 8.2 EUS 102.3.0-3.el8_2
  • thunderbird RHEL 8.1 E4S 102.3.0-3.el8_1

red hat advisories RHSA-2022:6715RHSA-2022:6710RHSA-2022:6716RHSA-2022:6717RHSA-2022:6708RHSA-2022:6713

  • MozillaThunderbird SLE Workstation Extension 15 SP4, SLE Workstation Extension 15 SP3, SLE Module for Package Hub 15 SP4 +3 more 102.4.0-150200.8.85.1
  • MozillaFirefox SLES for SAP 15 SP1, SLES for SAP 15, SLES 15-LTSS +7 more 102.3.0-150000.150.59.2
  • MozillaFirefox SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES 12 SP5 +6 more 102.3.0-112.133.1
  • MozillaFirefox SLES for SAP 15 SP2, SLES 15 SP2-LTSS, SLES 15 SP2-BCL +10 more 102.3.0-150200.152.61.1
  • MozillaFirefox-branding-SLE SLES for SAP 15 SP2, SLES 15 SP2-LTSS, SLES 15 SP2-BCL +10 more 102-150200.9.10.1

suse advisories SUSE-SU-2022:3800-1SUSE-SU-2022:3441-1SUSE-SU-2022:3440-1SUSE-SU-2022:3396-1

  • firefox-esr openSUSE Tumbleweed 128.5.1-1.1
  • MozillaThunderbird openSUSE Tumbleweed 102.3.0-1.1
  • MozillaFirefox openSUSE Tumbleweed 105.0.3-1.1

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:12358-1openSUSE-SU-2024:12398-1

  • firefox AlmaLinux 9 102.3.0-6.el9_0.alma
  • firefox AlmaLinux 8 102.3.0-6.el8_6.alma
  • thunderbird AlmaLinux 8 102.3.0-3.el8_6.alma
  • thunderbird AlmaLinux 9 102.3.0-3.el9_0.alma

almalinux advisories ALSA-2022:6700ALSA-2022:6702ALSA-2022:6708ALSA-2022:6717

  • thunderbird Rocky Linux 8 102.3.0-3.el8_6
  • firefox Rocky Linux 8 102.3.0-6.el8_6

rocky linux advisories RLSA-2022:6708RLSA-2022:6702

  • firefox-esr Alpine 3.23, Alpine 3.22, Alpine 3.21 +3 more 102.3.0-r0

alpine advisories ALPINE-CVE-2022-40962

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

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-2022-40962 updated cvss 8.8

Mozilla: Memory safety bugs fixed in Firefox 105 and Firefox ESR 102.3

  • Red Hat Enterprise Linux 6 firefox, thunderbird
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 8) firefox 102.3.0-6.el8_6, thunderbird 102.3.0-3.el8_6
    fixed: vendor fix RHSA-2022:6702
  • Red Hat Enterprise Linux AppStream (v. 9) firefox 102.3.0-6.el9_0, thunderbird 102.3.0-3.el9_0
    fixed: vendor fix RHSA-2022:6700
  • Red Hat Enterprise Linux AppStream E4S (v. 8.1) firefox 102.3.0-6.el8_1, thunderbird 102.3.0-3.el8_1
    fixed: vendor fix RHSA-2022:6703
  • Red Hat Enterprise Linux AppStream EUS (v. 8.2) firefox 102.3.0-6.el8_2, thunderbird 102.3.0-3.el8_2
    fixed: vendor fix RHSA-2022:6707
  • Red Hat Enterprise Linux AppStream EUS (v.8.4) firefox 102.3.0-6.el8_4, thunderbird 102.3.0-3.el8_4
    fixed: vendor fix RHSA-2022:6701
  • Red Hat Enterprise Linux Client (v. 7) firefox 102.3.0-6.el7_9, thunderbird 102.3.0-3.el7_9 Red Hat Enterprise Linux Client Optional (v. 7) firefox 102.3.0-6.el7_9 Red Hat Enterprise Linux Server (v. 7) firefox 102.3.0-6.el7_9 Red Hat Enterprise Linux Server Optional (v. 7) firefox 102.3.0-6.el7_9, thunderbird 102.3.0-3.el7_9 Red Hat Enterprise Linux Workstation (v. 7) firefox 102.3.0-6.el7_9, thunderbird 102.3.0-3.el7_9 Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 102.3.0-6.el7_9
    fixed: vendor fix RHSA-2022:6711

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
total
Assessed
18 mo ago

Exploit prediction

1.43% chance of exploitation in the next 30 days, higher than 73% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CNA 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

  • Mozilla Firefox ESR
  • Mozilla Thunderbird
  • Mozilla Firefox

Classification

Weakness

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.