CVE-2020-12410: High severity Mozilla Thunderbird vulnerability
Last updated 25 August 2025
Other sources
Mozilla developers reported memory safety bugs present in Firefox 76 and Firefox ESR 68.8. 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 Thunderbird < 68.9.0, Firefox < 77, and Firefox ESR < 68.9.
— Launchpad
Mozilla developers Tom Tung and Karl Tomlinson reported memory safety bugs present in Firefox 68.8. 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 Tom Tung and Karl Tomlinson reported memory safety bugs present in Firefox 76 and Firefox ESR 68.8. 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
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Thunderbirdto a version that resolves this vulnerability.Fixed in 68.9 - Upgrade
Upgrade
Firefoxto a version that resolves this vulnerability.Fixed in 77 - Upgrade
Upgrade
Firefox ESRto a version that resolves this vulnerability.Fixed in 68.9 - Upgrade
Upgrade
debian/firefoxto a version that resolves this vulnerability.Fixed in 149.0.2-1 - Upgrade
Upgrade
debian/firefox-esrto a version that resolves this vulnerability.Fixed in 115.14.0esr-1~deb11u1Fixed in 140.9.1esr-1~deb11u1Fixed in 128.14.0esr-1~deb12u1Fixed in 140.9.1esr-1~deb12u1Fixed in 140.8.0esr-1~deb13u1Fixed in 140.9.1esr-1~deb13u1Fixed in 140.9.1esr-1 - Upgrade
Upgrade
debian/thunderbirdto a version that resolves this vulnerability.Fixed in 1:115.12.0-1~deb11u1Fixed in 1:140.9.1esr-1~deb11u1Fixed in 1:140.6.0esr-1~deb12u1Fixed in 1:140.9.1esr-1~deb12u1Fixed in 1:140.8.0esr-1~deb13u1Fixed in 1:140.9.1esr-1~deb13u1Fixed in 1:140.9.0esr-1Fixed in 1:140.9.1esr-1 - Upgrade
Upgrade
alpine/firefox-esrto a version that resolves this vulnerability.Fixed in 68.9.0-r0 - Upgrade
Upgrade
alpine/mozjs68to a version that resolves this vulnerability.Fixed in 68.9.0-r0 - Upgrade
Upgrade
alpine/thunderbirdto a version that resolves this vulnerability.Fixed in 68.9.0-r0 - Upgrade
Upgrade
Thunderbirdto a version that resolves this vulnerability.Fixed in 68.9.0
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-2020-12410?
The severity of CVE-2020-12410 is critical with a CVSS score of 8.8.
Which software versions are affected by CVE-2020-12410?
Firefox 76, Firefox ESR 68.8, and Thunderbird < 68.9.0 are affected by CVE-2020-12410.
How can CVE-2020-12410 be exploited?
CVE-2020-12410 can be exploited by running arbitrary code through the exploitation of memory corruption.
How do I fix CVE-2020-12410?
To fix CVE-2020-12410, update to Thunderbird 68.9.0 or later, Firefox 77.0.1 or later, or apply the necessary patches for the affected Ubuntu Linux versions.
Where can I find more information about CVE-2020-12410?
You can find more information about CVE-2020-12410 at the following references: [Bugzilla](https://bugzilla.mozilla.org/buglist.cgi?bug_id=1619305%2C1632717), [Ubuntu Security Notice](https://usn.ubuntu.com/4421-1/), [Mozilla Security Advisories](https://www.mozilla.org/security/advisories/mfsa2020-20/).