CVE-2020-6825: Critical severity Mozilla Firefox vulnerability

Published Apr 7, 2020
·
Updated

Last updated 25 August 2025

Other sources

Mozilla developers and community members Tyson Smith and Christian Holler reported memory safety bugs present in Firefox 74 and Firefox ESR 68.6. 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.

Mozilla developers Tyson Smith and Christian Holler reported memory safety bugs present in Firefox 74 and Firefox ESR 68.6. 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.

— Mozilla

Affected Software

9 affected componentsFixes available
Mozilla Firefox<75
75
Mozilla Thunderbird<68.7
68.7
Mozilla Firefox<75.0
Mozilla Firefox ESR<68.7.0
Mozilla Thunderbird<68.7.0
Mozilla Firefox ESR<68.7
68.7
debian/firefox
152.0.6-1
debian/firefox-esr
115.14.0esr-1~deb11u1140.12.0esr-1~deb11u1140.12.0esr-1~deb12u1140.12.0esr-1~deb13u1140.12.0esr-1
debian/thunderbird
1:115.12.0-1~deb11u11:140.12.0esr-1~deb11u11:140.12.0esr-1~deb12u11:140.12.0esr-1~deb13u11:140.12.0esr-1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade Firefox to a version that resolves this vulnerability.

    Fixed in 75
  2. Upgrade

    Upgrade Thunderbird to a version that resolves this vulnerability.

    Fixed in 68.7
  3. Upgrade

    Upgrade Firefox ESR to a version that resolves this vulnerability.

    Fixed in 68.7
  4. Upgrade

    Upgrade debian/firefox to a version that resolves this vulnerability.

    Fixed in 152.0.6-1
  5. Upgrade

    Upgrade debian/firefox-esr to a version that resolves this vulnerability.

    Fixed in 115.14.0esr-1~deb11u1Fixed in 140.12.0esr-1~deb11u1Fixed in 140.12.0esr-1~deb12u1Fixed in 140.12.0esr-1~deb13u1Fixed in 140.12.0esr-1
  6. Upgrade

    Upgrade debian/thunderbird to a version that resolves this vulnerability.

    Fixed in 1:115.12.0-1~deb11u1Fixed in 1:140.12.0esr-1~deb11u1Fixed in 1:140.12.0esr-1~deb12u1Fixed in 1:140.12.0esr-1~deb13u1Fixed in 1:140.12.0esr-1
  7. Upgrade

    Upgrade Mozilla Firefox to a version that resolves this vulnerability.

    Fixed in 68.7
  8. Upgrade

    Upgrade Mozilla Thunderbird to a version that resolves this vulnerability.

    Fixed in 68.7.0
  9. Upgrade

    Upgrade Mozilla Firefox to a version that resolves this vulnerability.

    Fixed in 75

Event History

Apr 7, 2020
CVE Published
12:00 AM
Apr 24, 2020
CVE Published
via MITRE·03:50 PM
Data Sourced
via MITRE·03:50 PM
DescriptionWeakness
Data Sourced
via NVD·04:15 PM
DescriptionSeverityWeaknessAffected Software
Jan 11, 2024
Data Sourced
via Launchpad·11:52 PM
Description
Feb 23, 2026
Data Sourced
via Ubuntu·03:19 PM
RemedyDescriptionSeverityAffected Software
Jul 15, 2026
Data Sourced
via Debian·04:13 AM
DescriptionAffected Software

Parent advisories

This vulnerability appears in the following advisories.

Peer vulnerabilities

Found alongside the following vulnerabilities.

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Frequently Asked Questions

1

What is CVE-2020-6825?

CVE-2020-6825 is a vulnerability that involves memory safety bugs present in Firefox 74 and Firefox ESR 68.6, which could be exploited to run arbitrary code.

2

How severe is CVE-2020-6825?

CVE-2020-6825 has a severity rating of 9.8 (Critical).

3

Which software versions are affected by CVE-2020-6825?

Firefox versions up to and excluding 75 and Firefox ESR versions up to and excluding 68.7 are affected by CVE-2020-6825.

4

How can I fix CVE-2020-6825?

To fix CVE-2020-6825, update your Firefox browser to version 75 or later, or update your Firefox ESR browser to version 68.7 or later.

5

Where can I find more information about CVE-2020-6825?

You can find more information about CVE-2020-6825 on the Mozilla bugzilla and security advisories, as well as the Ubuntu security notice.

Company

Resources

Contact

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