CVE-2020-6820: Mozilla Firefox And Thunderbird Use-After-Free Vulnerability
First published: Fri Apr 03 2020(Updated: )
Last updated 21 August 2024
Credit: security@mozilla.org security@mozilla.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Mozilla Thunderbird | <68.7 | 68.7 |
| Mozilla Firefox | <74.0.1 | 74.0.1 |
| Mozilla Firefox ESR | <68.6.1 | 68.6.1 |
| Mozilla Firefox | <74.0.1 | |
| Mozilla Firefox ESR | <68.6.1 | |
| Mozilla Thunderbird | <68.7.0 | |
| Mozilla Firefox and Thunderbird | ||
| debian/firefox | 132.0.1-1 | |
| debian/firefox-esr | 115.14.0esr-1~deb11u1 128.4.0esr-1~deb11u1 128.3.1esr-1~deb12u1 128.4.0esr-1~deb12u1 128.3.1esr-2 128.4.0esr-1 | |
| debian/thunderbird | 1:115.12.0-1~deb11u1 1:128.4.0esr-1~deb11u1 1:115.16.0esr-1~deb12u1 1:128.4.0esr-1~deb12u1 1:128.4.0esr-1 1:128.4.2esr-1 |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
- https://bugzilla.mozilla.org/show_bug.cgi?id=1626728
- https://www.mozilla.org/security/advisories/mfsa2020-11/
- https://www.mozilla.org/security/advisories/mfsa2020-14/
- https://usn.ubuntu.com/4335-1/
- https://launchpad.net/bugs/cve/CVE-2020-6820
- https://www.mozilla.org/en-US/security/advisories/mfsa2020-14/
- https://www.mozilla.org/en-US/security/advisories/mfsa2020-11/
- https://nvd.nist.gov/vuln/detail/CVE-2020-6820
- https://www.mozilla.org/en-US/security/advisories/mfsa2020-11/#CVE-2020-6820
- https://www.mozilla.org/en-US/security/advisories/mfsa2020-14/#CVE-2020-6820
- https://security-tracker.debian.org/tracker/CVE-2020-6820
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-6820
- https://ubuntu.com/security/CVE-2020-6820
Peer vulnerabilities
(Found alongside the following vulnerabilities)
Frequently Asked Questions
What is CVE-2020-6820?
CVE-2020-6820 is a use-after-free vulnerability in Mozilla Firefox and Thunderbird.
Which software is affected by CVE-2020-6820?
Mozilla Firefox < 74.0.1, Firefox ESR < 68.6.1, and Thunderbird < 68.7.0 are affected.
How severe is CVE-2020-6820?
CVE-2020-6820 has a severity rating of 8.1 (critical).
How do I fix CVE-2020-6820 in Mozilla Firefox?
Update Mozilla Firefox to version 74.0.1 or higher to fix CVE-2020-6820.
How do I fix CVE-2020-6820 in Thunderbird?
Upgrade Thunderbird to version 68.7.0 or higher to fix CVE-2020-6820.
- agent/type
- agent/first-publish-date
- collector/launchpad-cve
- source/Launchpad
- agent/author
- agent/title
- agent/severity
- collector/mozilla-advisory
- source/Mozilla
- agent/software-canonical-lookup
- agent/description
- agent/software-canonical-lookup-request
- agent/weakness
- collector/nvd-cve
- source/NVD
- collector/nvd-index
- collector/mitre-cve
- source/MITRE
- agent/last-modified-date
- agent/event
- agent/references
- agent/tags
- exploited/true
- collector/cisa-known-exploited
- source/CISA
- collector/security-tracker-debian
- source/Debian
- agent/softwarecombine
- collector/usn-cve
- source/Ubuntu
- vendor/mozilla
- canonical/mozilla thunderbird
- canonical/mozilla firefox
- canonical/mozilla firefox esr
- canonical/mozilla firefox and thunderbird
- package-manager/debian