🛡️ CVE-2022-31747 — firefox

🔴 CVSS 9.8 — Critical ✅ No Known Exploit CWE-125 NVD

9.8

CVSS Score

0 Low4 Medium7 High9 Critical10

Description

Mozilla developers Andrew McCreight, Nicolas B. Pierron, and the Mozilla Fuzzing Team reported memory safety bugs present in Firefox 100 and Firefox ESR 91.9. 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 Thunderbird < 91.10, Firefox < 101, and Firefox ESR < 91.10.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Weakness class

CVE-2022-31747 is classified as CWE-125: Out-of-bounds Read. The code reads past the limits of a buffer, exposing adjacent memory contents or crashing the process.

Affected software

CVE-2022-31747 is recorded against 3 packages.

firefox (fixed in 101)
firefox-esr (fixed in 91.10)
thunderbird (fixed in 91.10)

Timeline and source

Published on 22 December 2022 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

bugzilla.mozilla.org
www.mozilla.org
www.mozilla.org
www.mozilla.org
bugzilla.mozilla.org
www.mozilla.org
www.mozilla.org
www.mozilla.org

CVE-2022-31747 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Debian Ubuntu

Details

Severity CRITICAL

CVSS Score 9.8

CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE CWE-125

Public Exploit ✅ No

Source NVD

Published 2022-12-22

Updated 2026-08-11

Modified 2026-06-17

Fix URL N/A

Affected Packages

Software	From version	Fixed in
firefox	—	101
firefox-esr	—	91.10
thunderbird	—	91.10

References

Issue Tracking, Vendor Advisory https://bugzilla.mozilla.org/buglist.cgi?bug_id=1760765%2C1765610%2C1766283%2C1767365%2C1768559%2C1768734

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2022-20/

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2022-21/

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2022-22/

Issue Tracking, Vendor Advisory https://bugzilla.mozilla.org/buglist.cgi?bug_id=1760765%2C1765610%2C1766283%2C1767365%2C1768559%2C1768734

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2022-20/

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2022-21/

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2022-22/

🔗 NVD 🔗 Mitre

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Exploit Protection

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CVE-2022-31747 carries CVSS 9.8 Critical rating. BotEraser checks your installation against this and other known CVE records, and blocks IPs associated with exploit activity.

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