{"id":"CVE-2020-12401","title":"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","summary":"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 an…","severity":"medium","cvss":4.7,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","cwe":["CWE-203"],"vendor":"mozilla","product":"firefox","affected":["firefox < 80.0","firefox_mobile < 80.0"],"patched":["firefox 80.0","firefox_mobile 80.0"],"published":"2020-10-08","updated":"2026-08-19","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2020-12401","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1631573","label":"security@mozilla.org"},{"url":"https://lists.debian.org/debian-lts-announce/2023/02/msg00021.html","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2020-36/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2020-39/","label":"security@mozilla.org"},{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1631573","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2023/02/msg00021.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.mozilla.org/security/advisories/mfsa2020-36/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.mozilla.org/security/advisories/mfsa2020-39/","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd"],"epss":0.00323,"epssPercentile":0.25495,"ingestedAt":"2026-08-19T15:41:14.706Z","slug":"CVE-2020-12401","body":"## Overview\n\nDuring 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.\n\n## Affected\n\n- `firefox < 80.0`\n- `firefox_mobile < 80.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `firefox 80.0`\n- `firefox_mobile 80.0`","depth":"sunlit","depthScore":26,"depthScoreParts":{"impact":25.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}