Mozilla developers Kershaw Chang, Ryan VanderMeulen, and Randell Jesup reported memory safety bugs present in Firefox 97.

published 2022-12-22 3 y ago modified 2026-06-17 4 mo ago also EUVD-2022-15887

cvss: 8.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.6%; EPSS 0.6% chance of exploitation in 30 days, percentile 47%
public exploits: 0; none known

Mozilla developers Kershaw Chang, Ryan VanderMeulen, and Randell Jesup reported memory safety bugs present in Firefox 97. 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 < 98.

Patch / fix

fixed in 1 distros 4

Mozilla Firefox 98

ubuntu opensuse alpine arch linux

firefox Ubuntu 18.04 LTS 98.0+build3-0ubuntu0.18.04.2
firefox Ubuntu 20.04 LTS 98.0+build3-0ubuntu0.20.04.2
firefox Ubuntu 22.04 LTS 1:1snap1-0ubuntu1

ubuntu advisories UBUNTU-CVE-2022-0843

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

firefox-esr openSUSE Tumbleweed 128.5.1-1.1
MozillaFirefox openSUSE Tumbleweed 98.0-1.1

opensuse advisories openSUSE-SU-2024:14572-1 openSUSE-SU-2024:11908-1

firefox Alpine 3.23, Alpine 3.22, Alpine 3.21 +5 more 98.0-r0
librewolf Alpine 3.24, Alpine 3.23, Alpine 3.22 +1 more 98.0-r0

alpine advisories ALPINE-CVE-2022-0843

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

firefox Arch Linux 98.0-1

arch linux advisories AVG-2714

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 18 mo ago (2025-04-16)

Exploit prediction

0.57% chance of exploitation in the next 30 days, higher than 47% 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

Classification

Weakness

CWE-787 Out-of-bounds Write

References

mozilla.org /security/advisories/mfsa2022-10/
vendor-advisory
bugzilla.mozilla.org /buglist.cgi?bug_id=1746523%2C1749062%2C1749164%2C1749214%2C1749610%2C1750032%2C1752100%2C1752405%2C1753612%2C
issue-tracking, vendor-advisory

Sources

CVE List CVE-2022-0843
NVD CVE-2022-0843

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.

Summary