CVE-2020-12401

4.7 mediumEPSS 0.3%

Medium (4.7) in mozilla. EPSS 0.3% chance of exploitation in the next 30 days.

During ECDSA signature generation, padding applied in the nonce designed to ensure constant-time scalar multiplication was removed, resulting in variable-time execution dependent on secret data. This vulnerability affects Firefox < 80 and Firefox for Android < 80.

Severity

CVSS 3.1

4.7 medium

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

EPSS: 0.3% chance of exploitation in the next 30 days; higher than 25% of CVEs (scores of 2026-10-31)
CWE: CWE-203
Published: 2020-10-08
Modified: 2026-08-19
Record from: the NVD, synced 2026-10-19

Affected

mozilla:firefox
mozilla:firefox_mobile

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1631573
https://lists.debian.org/debian-lts-announce/2023/02/msg00021.html
https://www.mozilla.org/security/advisories/mfsa2020-36/
https://www.mozilla.org/security/advisories/mfsa2020-39/
https://bugzilla.mozilla.org/show_bug.cgi?id=1631573

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