What is CVE-2022-40962?

CVE-2022-40962 is a high-severity vulnerability in Mozilla Firefox, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2022-12-22.

How severe is CVE-2022-40962?

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

Buffer overflow in Mozilla Firefox

CVE-2022-40962

Mozilla developers Nika Layzell, Timothy Nikkel, Sebastian Hengst, Andreas Pehrson, and the Mozilla Fuzzing Team reported memory safety bugs present in Firefox 104 and Firefox ESR 102.2. 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 ESR < 102.3, Thunderbird < 102.3, and Firefox < 105.

Vulnerability class: Buffer Overflow

EPSS: 0.013 (68.4th percentile) — read the EPSS interpretation.

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.

Affected products

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

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

security@mozilla.org (Vendor Advisory)
security@mozilla.org (Vendor Advisory)
security@mozilla.org (Vendor Advisory)
security@mozilla.org (Issue Tracking, Broken Link)

Frequently asked questions

What is CVE-2022-40962?: CVE-2022-40962 is a high-severity vulnerability in Mozilla Firefox, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2022-12-22.
How severe is CVE-2022-40962?: High severity. CVSS v3 base score is 8.8 out of 10.