What is CVE-2022-31741?

CVE-2022-31741 is a high-severity vulnerability in Mozilla Firefox, classified under Use of Uninitialized Resource. CVSS score: 8.8/10. Published 2022-12-22.

How severe is CVE-2022-31741?

High severity. CVSS v3 base score is 8.8 out of 10.

Vulnerability in Mozilla Firefox

CVE-2022-31741

A crafted CMS message could have been processed incorrectly, leading to an invalid memory read, and potentially further memory corruption. This vulnerability affects Thunderbird < 91.10, Firefox < 101, and Firefox ESR < 91.10.

Published 2022-12-22 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.007 (49.7th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 49.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Mozilla Firefox — versions unspecified
Mozilla Firefox Esr — versions unspecified
Mozilla Firefox Esr
Mozilla Thunderbird — versions unspecified

Weakness classification (CWE)

CWE-908 — Use of Uninitialized Resource

References

www.mozilla.org/security/advisories/mfsa2022-20/ (Vendor Advisory)
www.mozilla.org/security/advisories/mfsa2022-22/ (Vendor Advisory)
www.mozilla.org/security/advisories/mfsa2022-21/ (Vendor Advisory)
bugzilla.mozilla.org/show_bug.cgi (Permissions Required, Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2022-31741?: CVE-2022-31741 is a high-severity vulnerability in Mozilla Firefox, classified under Use of Uninitialized Resource. CVSS score: 8.8/10. Published 2022-12-22.
How severe is CVE-2022-31741?: High severity. CVSS v3 base score is 8.8 out of 10.