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 | 133.0.3-1 | |
| debian/firefox-esr | 115.14.0esr-1~deb11u1 128.5.0esr-1~deb11u1 128.3.1esr-1~deb12u1 128.5.0esr-1~deb12u1 128.5.0esr-1 128.5.1esr-1 | |
| debian/thunderbird | 1:115.12.0-1~deb11u1 1:128.5.0esr-1~deb11u1 1:115.16.0esr-1~deb12u1 1:128.5.0esr-1~deb12u1 1:128.5.2esr-1 |
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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.
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