CVE-2020-6829: Mozilla Firefox

Medium severity, CVSS 5.3. EPSS: 1.5% chance of exploitation in the next 30 days.

When performing EC scalar point multiplication, the wNAF point multiplication algorithm was used; which leaked partial information about the nonce used during signature generation. Given an electro-magnetic trace of a few signature generations, the private key could have been computed. 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 2020-10-28. Last modified 2026-08-19.