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Mozilla developers reported memory safety bugs present in Firefox 83 and Firefox ESR 78.5. 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 Firefox < 84, Thunderbird < 78.6, and Firefox ESR < 78.6.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade thunderbirdUpgrade firefoxUpgrade mozjs78Upgrade librewolfUpgrade firefox-esr | Jan 19, 2021 | Jan 7, 2021 |
| Amazon Linux Ami 2 | — | Upgrade thunderbirdUpgrade thunderbird-debuginfo | Jan 8, 2021 | Jan 8, 2021 |
| Arch Linux | — | Upgrade to the latest version of Arch Linux | Jul 11, 2025 | Jan 7, 2021 |
| Centos_linux | — | Upgrade firefox-debuginfoUpgrade firefox-debugsourceUpgrade thunderbird-debuginfoUpgrade thunderbirdUpgrade firefoxUpgrade thunderbird-debugsource | Dec 21, 2020 | Dec 16, 2020 |
| Debian | — | Upgrade firefox-esrUpgrade thunderbird | Dec 18, 2020 | Dec 18, 2020 |
| Gentoo Linux | — | Upgrade mail-client/thunderbird-bin.Upgrade www-client/firefox.Upgrade www-client/firefox-bin.Upgrade mail-client/thunderbird. | Dec 29, 2020 | Dec 23, 2020 |
| Mfsa2020 54 | — | Upgrade to Mozilla Firefox version 84.0Upgrade to the latest version of Mozilla Firefox | Dec 16, 2020 | Dec 15, 2020 |
| Mfsa2020 55 | — | Upgrade to Mozilla Firefox ESR version 78.6Upgrade to the latest version of Mozilla Firefox | Dec 16, 2020 | Dec 15, 2020 |
| Mozilla Thunderbird | — | Upgrade to Mozilla Thunderbird version 78.6Upgrade to the latest version of Mozilla Thunderbird | Dec 16, 2020 | Dec 15, 2020 |
| Oracle Solaris | — | Upgrade library/libmozjs-78 to version 78.11.0-11.4.39.0.1.107.0 on Solaris 11.4Upgrade mail/thunderbird to version 78.6.0-11.4.30.0.1.88.0 on Solaris 11.4 | Feb 17, 2021 | Jan 7, 2021 |
| Oracle_linux | — | Upgrade firefoxUpgrade thunderbird | Dec 17, 2020 | Dec 15, 2020 |
| Redhat_linux | — | Upgrade thunderbird-debuginfoUpgrade firefoxUpgrade thunderbirdNo solution existsUpgrade firefox-debuginfoUpgrade thunderbird-debugsourceUpgrade firefox-debugsource | Dec 21, 2020 | Dec 16, 2020 |
| Suse | — | Upgrade MozillaFirefox-translations-commonUpgrade mozillafirefox-branding-upstreamUpgrade MozillaFirefoxUpgrade MozillaFirefox-translations-otherUpgrade MozillaThunderbird-translations-otherUpgrade mozillafirefox-buildsymbolsUpgrade MozillaThunderbird-translations-commonUpgrade MozillaFirefox-develUpgrade MozillaThunderbird | Dec 22, 2020 | Dec 15, 2020 |
| Ubuntu | — | Upgrade firefoxUpgrade thunderbird | Dec 16, 2020 | Dec 15, 2020 |
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