What’s Vulnerable › Vulnerabilities

CVE-2020-12400

• Severity: medium (CVSS 4.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-10-08 · updated 2026-08-19
• Weakness: CWE-203

Description

When converting coordinates from projective to affine, the modular inversion was not performed in constant time, resulting in a possible timing-based side channel attack. This vulnerability affects Firefox < 80 and Firefox for Android < 80.

Affected products

• Mozilla Firefox: before 80.0 — fixed in 80.0
• Mozilla Firefox for Android: before 80.0 — fixed in 80.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 80.0; Mozilla Firefox for Android 80.0. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1623116
• 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=1623116
• 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/

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