Vulnerability in Mozilla Firefox
CVE-2020-12401
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.
EPSS: 0.003 (24.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N.
Affected products
- Mozilla Firefox — versions unspecified
- Mozilla Firefox For Android — versions unspecified
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security@mozilla.org (Vendor Advisory)
- security@mozilla.org (Vendor Advisory)
- security@mozilla.org (Permissions Required, Issue Tracking, Vendor Advisory)
- security@mozilla.org (mailing-list)
Frequently asked questions
- What is CVE-2020-12401?
- CVE-2020-12401 is a medium-severity vulnerability in Mozilla Firefox, classified under Observable Discrepancy. CVSS score: 4.7/10. Published 2020-10-08.
- How severe is CVE-2020-12401?
- Medium severity. CVSS v3 base score is 4.7 out of 10.
- Is CVE-2020-12401 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.