---
id: CVE-2020-6829
title: >-
  When performing EC scalar point multiplication, the wNAF point multiplication
  algorithm was used; which leaked partial information about the nonce used
  during signature generation
summary: >-
  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 gener…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'
vendor: mozilla
product: firefox
affected:
  - firefox < 80.0
  - firefox_mobile < 80.0
patched:
  - firefox 80.0
  - firefox_mobile 80.0
published: '2020-10-28'
updated: '2026-08-19'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2020-6829'
references:
  - url: 'https://bugzilla.mozilla.org/show_bug.cgi?id=1631583'
    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=1631583'
    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: 0.01467
epssPercentile: 0.72593
ingestedAt: '2026-08-19T15:41:14.743Z'
---

## Overview

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

- `firefox < 80.0`
- `firefox_mobile < 80.0`

## Remediation

Upgrade past the affected range:

- `firefox 80.0`
- `firefox_mobile 80.0`