CVE-2020-15667

8.8 highEPSS 1.6%

High (8.8) in mozilla firefox. EPSS 1.6% chance of exploitation in the next 30 days.

When processing a MAR update file, after the signature has been validated, an invalid name length could result in a heap overflow, leading to memory corruption and potentially arbitrary code execution. Within Firefox as released by Mozilla, this issue is only exploitable with the Mozilla-controlled signing key. This vulnerability affects Firefox < 80.

Severity

CVSS 3.1

8.8 high

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

EPSS: 1.6% chance of exploitation in the next 30 days; higher than 76% of CVEs (scores of 2026-10-31)
CWE: CWE-787
Published: 2020-10-01
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

mozilla:firefox

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1653371
https://www.mozilla.org/security/advisories/mfsa2020-36/
https://bugzilla.mozilla.org/show_bug.cgi?id=1653371
https://www.mozilla.org/security/advisories/mfsa2020-36/

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