---
id: CVE-2020-15670
title: >-
  Mozilla developers reported memory safety bugs present in Firefox for Android
  79
summary: >-
  Mozilla developers reported memory safety bugs present in Firefox for Android
  79. Some of these bugs showed evidence of memory corruption and we presume
  that with enough effort some of these could have been exploited to run
  arbitrary cod…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'
cwe:
  - CWE-362
  - CWE-416
  - CWE-617
vendor: mozilla
product: firefox
affected:
  - firefox < 80.0
  - firefox_esr < 78.2
  - firefox_mobile < 80.0
  - thunderbird < 78.2
patched:
  - firefox 80.0
  - firefox_esr 78.2
  - firefox_mobile 80.0
  - thunderbird 78.2
published: '2020-10-01'
updated: '2026-08-19'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2020-15670'
references:
  - url: >-
      https://bugzilla.mozilla.org/buglist.cgi?bug_id=1651001%2C1653626%2C1656957
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2020-36/'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2020-38/'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2020-39/'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2020-41/'
    label: security@mozilla.org
  - url: >-
      https://bugzilla.mozilla.org/buglist.cgi?bug_id=1651001%2C1653626%2C1656957
    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/mfsa2020-38/'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.mozilla.org/security/advisories/mfsa2020-39/'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.mozilla.org/security/advisories/mfsa2020-41/'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.01071
epssPercentile: 0.63442
ingestedAt: '2026-08-19T15:41:14.590Z'
---

## Overview

Mozilla developers reported memory safety bugs present in Firefox for Android 79. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 80, Firefox ESR < 78.2, Thunderbird < 78.2, and Firefox for Android < 80.

## Affected

- `firefox < 80.0`
- `firefox_esr < 78.2`
- `firefox_mobile < 80.0`
- `thunderbird < 78.2`

## Remediation

Upgrade past the affected range:

- `firefox 80.0`
- `firefox_esr 78.2`
- `firefox_mobile 80.0`
- `thunderbird 78.2`