Memory safety bugs present in Firefox 111.

published 2023-06-02 3 y ago modified 2026-08-19 2 mo ago also EUVD-2023-33093

cvss: 8.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.5%; EPSS 0.5% chance of exploitation in 30 days, percentile 44%
public exploits: 0; none known

Memory safety bugs present in Firefox 111. 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 for Android < 112, Firefox < 112, and Focus for Android < 112.

Patch / fix

fixed in 3 distros 2

Mozilla Firefox for Android 112
Mozilla Firefox 112
Mozilla Focus for Android 112

ubuntu opensuse

firefox Ubuntu 18.04 LTS 112.0+build2-0ubuntu0.18.04.1
firefox Ubuntu 20.04 LTS 112.0+build2-0ubuntu0.20.04.1

ubuntu advisories UBUNTU-CVE-2023-29551

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 112.0.1-1.1

opensuse advisories openSUSE-SU-2024:14572-1 openSUSE-SU-2024:12882-1

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 22 mo ago (2025-01-08)

Exploit prediction

0.53% chance of exploitation in the next 30 days, higher than 44% 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 for Android
Mozilla Firefox
Mozilla Focus for Android

Classification

Weakness

CWE-787 Out-of-bounds Write

References

mozilla.org /security/advisories/mfsa2023-13/
vendor-advisory
bugzilla.mozilla.org /buglist.cgi?bug_id=1763625%2C1814314%2C1815798%2C1815890%2C1819239%2C1819465%2C1819486%2C1819492%2C1819957%2C
issue-tracking, not-applicable

Sources

CVE List CVE-2023-29551
NVD CVE-2023-29551

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