CVE-2020-6800: High severity Mozilla Firefox vulnerability
Last updated 25 August 2025
Other sources
Mozilla developers and community members Raul Gurzau, Tyson Smith, Bob Clary, Liz Henry, and Christian Holler reported memory safety bugs present in Firefox 72 and Firefox ESR 68.4. 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 and community members reported memory safety bugs present in Firefox 72 and Firefox ESR 68.4. 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. In general, these flaws cannot be exploited through email in the Thunderbird product because scripting is disabled when reading mail, but are potentially risks in browser or browser-like contexts. This vulnerability affects Thunderbird < 68.5, Firefox < 73, and Firefox < ESR68.5.
— Launchpad
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Thunderbirdto a version that resolves this vulnerability.Fixed in 68.5 - Upgrade
Upgrade
Firefox ESRto a version that resolves this vulnerability.Fixed in 68.5 - Upgrade
Upgrade
Firefoxto a version that resolves this vulnerability.Fixed in 73 - Upgrade
Upgrade
debian/firefoxto a version that resolves this vulnerability.Fixed in 152.0.6-1 - Upgrade
Upgrade
debian/firefox-esrto 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 - Upgrade
Upgrade
debian/thunderbirdto 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 - Upgrade
Upgrade
Mozilla Thunderbirdto a version that resolves this vulnerability.Fixed in 68.5 - Upgrade
Upgrade
Mozilla Firefoxto a version that resolves this vulnerability.Fixed in 73 - Upgrade
Upgrade
Mozilla Firefox ESRto a version that resolves this vulnerability.Fixed in 68.5
Event History
Parent advisories
This vulnerability appears in the following advisories.
Peer vulnerabilities
Found alongside the following vulnerabilities.
Frequently Asked Questions
What is the severity of CVE-2020-6800?
The severity of CVE-2020-6800 is high with a severity value of 8.8.
Which software is affected by CVE-2020-6800?
Firefox 72, Firefox ESR 68.4, Mozilla Firefox ESR, and Mozilla Thunderbird are affected by CVE-2020-6800.
What is the remedy for CVE-2020-6800?
Update to Mozilla Firefox ESR version 68.5 or later, or Mozilla Firefox version 73.0 or later.
Where can I find more information about CVE-2020-6800?
You can find more information about CVE-2020-6800 on the Mozilla Bugzilla and Mozilla Security Advisories websites.
What is the Common Weakness Enumeration (CWE) for CVE-2020-6800?
The Common Weakness Enumeration (CWE) for CVE-2020-6800 is CWE-787.