CVE-2022-34476

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% 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-20

Description

ASN.1 parsing of an indefinite SEQUENCE inside an indefinite GROUP could have resulted in the parser accepting malformed ASN.1. This vulnerability affects Firefox < 102.

Affected products

Mozilla Firefox: before 102.0 — fixed in 102.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 102.0. Check the vendor advisory for mitigations.

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1387919
https://www.mozilla.org/security/advisories/mfsa2022-24/
https://bugzilla.mozilla.org/show_bug.cgi?id=1387919
https://www.mozilla.org/security/advisories/mfsa2022-24/

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