---
id: CVE-2023-29550
title: Memory safety bugs present in Firefox 111 and Firefox ESR 102.9
summary: >-
  Memory safety bugs present in Firefox 111 and Firefox ESR 102.9. 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
  vulnerabi…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'
vendor: mozilla
product: firefox
affected:
  - firefox < 112.0
  - firefox_esr < 102.10
  - firefox_mobile < 112.0
  - focus < 112.0
  - thunderbird < 102.10
patched:
  - firefox 112.0
  - firefox_esr 102.10
  - firefox_mobile 112.0
  - focus 112.0
  - thunderbird 102.10
published: '2023-06-02'
updated: '2026-08-19'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2023-29550'
references:
  - url: >-
      https://bugzilla.mozilla.org/buglist.cgi?bug_id=1720594%2C1812498%2C1814217%2C1818357%2C1751945%2C1818762%2C1819493%2C1820389%2C1820602%2C1821448%2C1822413%2C1824828
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2023-13/'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2023-14/'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2023-15/'
    label: security@mozilla.org
  - url: >-
      https://bugzilla.mozilla.org/buglist.cgi?bug_id=1720594%2C1812498%2C1814217%2C1818357%2C1751945%2C1818762%2C1819493%2C1820389%2C1820602%2C1821448%2C1822413%2C1824828
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.mozilla.org/security/advisories/mfsa2023-13/'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.mozilla.org/security/advisories/mfsa2023-14/'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.mozilla.org/security/advisories/mfsa2023-15/'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.00702
epssPercentile: 0.51171
ingestedAt: '2026-08-19T15:41:15.840Z'
---

## Overview

Memory safety bugs present in Firefox 111 and Firefox ESR 102.9. 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 < 112, Focus for Android < 112, Firefox ESR < 102.10, Firefox for Android < 112, and Thunderbird < 102.10.

## Affected

- `firefox < 112.0`
- `firefox_esr < 102.10`
- `firefox_mobile < 112.0`
- `focus < 112.0`
- `thunderbird < 102.10`

## Remediation

Upgrade past the affected range:

- `firefox 112.0`
- `firefox_esr 102.10`
- `firefox_mobile 112.0`
- `focus 112.0`
- `thunderbird 102.10`