# CVE-2020-12410: Firefox ESR: Mozilla developers reported memory safety bugs present in Firefox 76 and Firefox ESR 68.8. CVE-2020-12410 is fixed in 10 products on 2 platforms, first by firefox 77.0.1+build1-0ubuntu0.18.04.1, released June 2, 2020. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2020-12410 - Priority: High - CVSS: 8.8 (Important) - EPSS: 0.0173 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Jun 2, 2020 - Vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2020-12410 ## Description 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. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Windows apps | Mozilla Firefox ESR (en-US) | 78.0esr | [Mozilla Firefox ESR (en-US) 78.0esr](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.esr-78.0esr.md) | Jun 25, 2020 | | Linux | firefox RHEL 8 | 0:68.9.0-1.el8_2 | [RHSA-2020:2379](https://patchblox.com/security/data/fix/linux/rhsa-2020-2379.md) | Jun 3, 2020 | | Linux | firefox Ubuntu 18.04.6 LTS (bionic) | 77.0.1+build1-0ubuntu0.18.04.1 | [firefox 77.0.1+build1-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-77.0.1-build1-0ubuntu0.18.04.1.md) | Jun 2, 2020 | | Linux | firefox Ubuntu 20.04 LTS (focal) | 77.0.1+build1-0ubuntu0.20.04.1 | [firefox 77.0.1+build1-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-77.0.1-build1-0ubuntu0.20.04.1.md) | Jun 2, 2020 | | Linux | firefox ol 8 | 0:68.9.0-1.0.1.el8_2 | [ELSA-2020-2379](https://patchblox.com/security/data/fix/linux/elsa-2020-2379.md) | Jun 5, 2020 | | Linux | firefox-geckodriver Ubuntu 18.04.6 LTS (bionic) | 77.0.1+build1-0ubuntu0.18.04.1 | [firefox-geckodriver 77.0.1+build1-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-geckodriver-77.0.1-build1-0ubuntu0.18.04.1.md) | Jun 2, 2020 | | Linux | firefox-geckodriver Ubuntu 20.04 LTS (focal) | 77.0.1+build1-0ubuntu0.20.04.1 | [firefox-geckodriver 77.0.1+build1-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-geckodriver-77.0.1-build1-0ubuntu0.20.04.1.md) | Jun 2, 2020 | | Linux | firefox-mozsymbols Ubuntu 18.04.6 LTS (bionic) | 77.0.1+build1-0ubuntu0.18.04.1 | [firefox-mozsymbols 77.0.1+build1-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-mozsymbols-77.0.1-build1-0ubuntu0.18.04.1.md) | Jun 2, 2020 | | Linux | firefox-mozsymbols Ubuntu 20.04 LTS (focal) | 77.0.1+build1-0ubuntu0.20.04.1 | [firefox-mozsymbols 77.0.1+build1-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-mozsymbols-77.0.1-build1-0ubuntu0.20.04.1.md) | Jun 2, 2020 | | Linux | thunderbird RHEL 8 | 0:68.9.0-1.el8_2 | [RHSA-2020:2614](https://patchblox.com/security/data/fix/linux/rhsa-2020-2614.md) | Jun 22, 2020 | | Linux | thunderbird Ubuntu 18.04.6 LTS (bionic) | 1:68.10.0+build1-0ubuntu0.18.04.1 | [thunderbird 1:68.10.0+build1-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-thunderbird-1-68.10.0-build1-0ubuntu0.18.04.1.md) | Oct 8, 2020 | | Linux | thunderbird Ubuntu 20.04 LTS (focal) | 1:68.10.0+build1-0ubuntu0.20.04.1 | [thunderbird 1:68.10.0+build1-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-thunderbird-1-68.10.0-build1-0ubuntu0.20.04.1.md) | Oct 8, 2020 | | Linux | thunderbird ol 8 | 0:68.9.0-1.0.1.el8_2 | [ELSA-2020-2614](https://patchblox.com/security/data/fix/linux/elsa-2020-2614.md) | Jun 23, 2020 | | Linux | thunderbird-gnome-support Ubuntu 18.04.6 LTS (bionic) | 1:68.10.0+build1-0ubuntu0.18.04.1 | [thunderbird-gnome-support 1:68.10.0+build1-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-thunderbird-gnome-support-1-68.10.0-build1-0ubuntu0.18.04.1.md) | Oct 8, 2020 | | Linux | thunderbird-gnome-support Ubuntu 20.04 LTS (focal) | 1:68.10.0+build1-0ubuntu0.20.04.1 | [thunderbird-gnome-support 1:68.10.0+build1-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-thunderbird-gnome-support-1-68.10.0-build1-0ubuntu0.20.04.1.md) | Oct 8, 2020 | | Linux | thunderbird-mozsymbols Ubuntu 18.04.6 LTS (bionic) | 1:68.10.0+build1-0ubuntu0.18.04.1 | [thunderbird-mozsymbols 1:68.10.0+build1-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-thunderbird-mozsymbols-1-68.10.0-build1-0ubuntu0.18.04.1.md) | Oct 8, 2020 | | Linux | thunderbird-mozsymbols Ubuntu 20.04 LTS (focal) | 1:68.10.0+build1-0ubuntu0.20.04.1 | [thunderbird-mozsymbols 1:68.10.0+build1-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-thunderbird-mozsymbols-1-68.10.0-build1-0ubuntu0.20.04.1.md) | Oct 8, 2020 | | Linux | xul-ext-calendar-timezones Ubuntu 18.04.6 LTS (bionic) | 1:68.10.0+build1-0ubuntu0.18.04.1 | [xul-ext-calendar-timezones 1:68.10.0+build1-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xul-ext-calendar-timezones-1-68.10.0-build1-0ubuntu0.18.04.1.md) | Oct 8, 2020 | | Linux | xul-ext-calendar-timezones Ubuntu 20.04 LTS (focal) | 1:68.10.0+build1-0ubuntu0.20.04.1 | [xul-ext-calendar-timezones 1:68.10.0+build1-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-xul-ext-calendar-timezones-1-68.10.0-build1-0ubuntu0.20.04.1.md) | Oct 8, 2020 | | Linux | xul-ext-gdata-provider Ubuntu 18.04.6 LTS (bionic) | 1:68.10.0+build1-0ubuntu0.18.04.1 | [xul-ext-gdata-provider 1:68.10.0+build1-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xul-ext-gdata-provider-1-68.10.0-build1-0ubuntu0.18.04.1.md) | Oct 8, 2020 | | Linux | xul-ext-gdata-provider Ubuntu 20.04 LTS (focal) | 1:68.10.0+build1-0ubuntu0.20.04.1 | [xul-ext-gdata-provider 1:68.10.0+build1-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-xul-ext-gdata-provider-1-68.10.0-build1-0ubuntu0.20.04.1.md) | Oct 8, 2020 | | Linux | xul-ext-lightning Ubuntu 18.04.6 LTS (bionic) | 1:68.10.0+build1-0ubuntu0.18.04.1 | [xul-ext-lightning 1:68.10.0+build1-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xul-ext-lightning-1-68.10.0-build1-0ubuntu0.18.04.1.md) | Oct 8, 2020 | | Linux | xul-ext-lightning Ubuntu 20.04 LTS (focal) | 1:68.10.0+build1-0ubuntu0.20.04.1 | [xul-ext-lightning 1:68.10.0+build1-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-xul-ext-lightning-1-68.10.0-build1-0ubuntu0.20.04.1.md) | Oct 8, 2020 | --- Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.