---
id: CVE-2020-15668
title: >-
  A lock was missing when accessing a data structure and importing certificate
  information into the trust database
summary: >-
  A lock was missing when accessing a data structure and importing certificate
  information into the trust database. This vulnerability affects Firefox < 80
  and Firefox for Android < 80.
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N'
cwe:
  - CWE-667
vendor: mozilla
product: firefox
affected:
  - firefox < 80.0
  - firefox_mobile < 80.0
patched:
  - firefox 80.0
  - firefox_mobile 80.0
published: '2020-10-01'
updated: '2026-08-19'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2020-15668'
references:
  - url: 'https://bugzilla.mozilla.org/show_bug.cgi?id=1651520'
    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=1651520'
    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: 0.00535
epssPercentile: 0.42646
ingestedAt: '2026-08-19T15:41:14.529Z'
---

## Overview

A lock was missing when accessing a data structure and importing certificate information into the trust database. 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`