CVE-2020-12400: Mozilla Firefox

Medium severity, CVSS 4.7. EPSS: 0.3% chance of exploitation in the next 30 days.

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 Mobile: before 80.0 (fixed in 80.0)

Published 2020-10-08. Last modified 2026-08-19.