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Fencer Vulns
high 8.8

CVE-2022-22764 json

Mozilla developers Paul Adenot and the Mozilla Fuzzing Team reported memory safety bugs present in Firefox 96 and Firefox ESR 91.5.

published 2022-12-22 3 y ago modified 2026-06-17 4 mo ago also EUVD-2022-27907

cvss
8.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 55%
public exploits
0
none known

Summary

Mozilla developers Paul Adenot and the Mozilla Fuzzing Team reported memory safety bugs present in Firefox 96 and Firefox ESR 91.5. 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 < 97, Thunderbird < 91.6, and Firefox ESR < 91.6.

Patch / fix

  • Mozilla Firefox 97
  • Mozilla Thunderbird 91.6
  • Mozilla Firefox ESR 91.6
  • firefox-esr Debian 14, Debian 13, Debian 12 91.6.0esr-1
  • thunderbird Debian 14, Debian 13, Debian 12 1:91.6.0-1

debian advisories DEBIAN-CVE-2022-22764

  • firefox Ubuntu 18.04 LTS 97.0+build2-0ubuntu0.18.04.1
  • firefox Ubuntu 20.04 LTS 97.0+build2-0ubuntu0.20.04.1
  • firefox Ubuntu 22.04 LTS 97.0+build2-0ubuntu1
  • thunderbird Ubuntu 18.04 LTS 1:91.7.0+build2-0ubuntu0.18.04.1
  • thunderbird Ubuntu 20.04 LTS 1:91.7.0+build2-0ubuntu0.20.04.1
  • thunderbird Ubuntu 22.04 LTS 1:91.6.1+build1-0ubuntu1

ubuntu advisories UBUNTU-CVE-2022-22764

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 91.6.0-1.el8_5
  • thunderbird RHEL 7 91.6.0-1.el7_9
  • firefox RHEL 7 91.6.0-1.el7_9
  • firefox RHEL 8 91.6.0-1.el8_5
  • thunderbird RHEL 8.4 EUS 91.6.0-1.el8_4
  • thunderbird RHEL 8.2 EUS 91.6.0-1.el8_2
  • thunderbird RHEL 8.1 E4S 91.6.0-1.el8_1
  • firefox RHEL 8.4 EUS 91.6.0-1.el8_4

red hat advisories RHSA-2022:0536RHSA-2022:0537RHSA-2022:0535RHSA-2022:0538RHSA-2022:0539RHSA-2022:0514

  • MozillaFirefox SLES for SAP 15 SP2, SLES 15 SP2-LTSS, SLES 15 SP2-BCL +8 more 91.6.0-152.15.1
  • MozillaFirefox SLES for SAP 15 SP1, SLES for SAP 15, SLES 15-LTSS +7 more 91.6.0-150.18.1
  • MozillaFirefox SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +11 more 91.6.0-112.89.1
  • MozillaThunderbird SLE Workstation Extension 15 SP3 91.6.1-8.54.1
  • MozillaFirefox SLES 11 SP4-LTSS 91.6.0-78.162.2

suse advisories SUSE-SU-2022:0696-1SUSE-SU-2022:0676-1SUSE-SU-2022:0565-1SUSE-SU-2022:14896-1SUSE-SU-2022:0559-1

  • firefox-esr openSUSE Tumbleweed 128.5.1-1.1
  • MozillaFirefox openSUSE Tumbleweed 97.0-1.1
  • MozillaThunderbird openSUSE Tumbleweed 91.6.0-1.1
  • MozillaThunderbird openSUSE Leap 15.3 91.6.1-8.54.1

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:11837-1openSUSE-SU-2024:11842-1openSUSE-SU-2022:0559-1

  • thunderbird AlmaLinux 8 91.6.0-1.el8_5.alma
  • thunderbird AlmaLinux 8 91.6.0-1.el8_5.alma.plus
  • firefox AlmaLinux 8 91.6.0-1.el8_5.alma

almalinux advisories ALSA-2022:0535ALSA-2022:0510

  • thunderbird Rocky Linux 8 91.6.0-1.el8_5
  • firefox Rocky Linux 8 91.6.0-1.el8_5

rocky linux advisories RLSA-2022:0535RLSA-2022:0510

  • firefox Alpine 3.23, Alpine 3.22, Alpine 3.21 +5 more 97.0-r0
  • librewolf Alpine 3.24, Alpine 3.23, Alpine 3.22 +1 more 97.0-r0
  • firefox-esr Alpine 3.23, Alpine 3.22, Alpine 3.21 +6 more 91.6.0-r0
  • thunderbird Alpine 3.23, Alpine 3.22, Alpine 3.21 +5 more 91.6.0-r0

alpine advisories ALPINE-CVE-2022-22764

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-2022-22764 updated cvss 8.8

Mozilla: Memory safety bugs fixed in Firefox 97 and Firefox ESR 91.6

  • Red Hat Enterprise Linux 6 firefox, thunderbird
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 8) firefox 91.6.0-1.el8_5, thunderbird 91.6.0-1.el8_5
    fixed: vendor fix RHSA-2022:0510
  • Red Hat Enterprise Linux AppStream E4S (v. 8.1) firefox 91.6.0-1.el8_1, thunderbird 91.6.0-1.el8_1
    fixed: vendor fix RHSA-2022:0513
  • Red Hat Enterprise Linux AppStream EUS (v. 8.2) firefox 91.6.0-1.el8_2, thunderbird 91.6.0-1.el8_2
    fixed: vendor fix RHSA-2022:0512
  • Red Hat Enterprise Linux AppStream EUS (v.8.4) firefox 91.6.0-1.el8_4, thunderbird 91.6.0-1.el8_4
    fixed: vendor fix RHSA-2022:0511
  • Red Hat Enterprise Linux Client (v. 7) firefox 91.6.0-1.el7_9, thunderbird 91.6.0-1.el7_9 Red Hat Enterprise Linux Client Optional (v. 7) firefox 91.6.0-1.el7_9 Red Hat Enterprise Linux Server (v. 7) firefox 91.6.0-1.el7_9 Red Hat Enterprise Linux Server Optional (v. 7) firefox 91.6.0-1.el7_9, thunderbird 91.6.0-1.el7_9 Red Hat Enterprise Linux Workstation (v. 7) firefox 91.6.0-1.el7_9, thunderbird 91.6.0-1.el7_9 Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 91.6.0-1.el7_9
    fixed: vendor fix RHSA-2022:0514
  • Red Hat Enterprise Linux 9 firefox, firefox-x11, thunderbird
    not affected: vulnerable code not present

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

0.75% chance of exploitation in the next 30 days, higher than 55% 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
  • Mozilla Thunderbird
  • Mozilla Firefox ESR

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.