CVE-2022-38476

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-12-22 · updated 2026-06-17
Weakness: CWE-416

Description

A data race could occur in the <code>PK11_ChangePW</code> function, potentially leading to a use-after-free vulnerability. In Firefox, this lock protected the data when a user changed their master password. This vulnerability affects Firefox ESR < 102.2 and Thunderbird < 102.2.

Affected products

Mozilla Firefox ESR: before 102.2 — fixed in 102.2
Mozilla Thunderbird: before 102.2 — fixed in 102.2

How to fix

Upgrade to a fixed version: Mozilla Firefox ESR 102.2; Mozilla Thunderbird 102.2. Check the vendor advisory for mitigations.

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1760998
https://www.mozilla.org/security/advisories/mfsa2022-34/
https://www.mozilla.org/security/advisories/mfsa2022-36/
https://bugzilla.mozilla.org/show_bug.cgi?id=1760998
https://www.mozilla.org/security/advisories/mfsa2022-34/
https://www.mozilla.org/security/advisories/mfsa2022-36/

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