CVE-2020-26972

9.8 criticalEPSS 1.3%

Critical (9.8) in mozilla firefox. EPSS 1.3% chance of exploitation in the next 30 days.

The lifecycle of IPC Actors allows managed actors to outlive their manager actors; and the former must ensure that they are not attempting to use a dead actor they have a reference to. Such a check was omitted in WebGL, resulting in a use-after-free and a potentially exploitable crash. This vulnerability affects Firefox < 84.

Severity

CVSS 3.1

9.8 critical

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

EPSS: 1.3% chance of exploitation in the next 30 days; higher than 70% of CVEs (scores of 2026-10-31)
CWE: CWE-416
Published: 2021-01-07
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

mozilla:firefox

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1671382
https://www.mozilla.org/security/advisories/mfsa2020-54/
https://bugzilla.mozilla.org/show_bug.cgi?id=1671382
https://www.mozilla.org/security/advisories/mfsa2020-54/

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