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Using the new logical assignment operators in a JavaScript switch statement could have caused a type confusion, leading to a memory corruption and a potentially exploitable crash. This vulnerability affects Firefox < 85, Thunderbird < 78.7, and Firefox ESR < 78.7.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade thunderbirdUpgrade firefoxUpgrade firefox-esrUpgrade librewolfUpgrade mozjs78 | Jun 17, 2022 | Feb 26, 2021 |
| Amazon Linux Ami 2 | — | Upgrade thunderbirdUpgrade thunderbird-debuginfo | Feb 22, 2021 | Feb 22, 2021 |
| Arch Linux | — | Upgrade to the latest version of Arch Linux | Jul 11, 2025 | Feb 26, 2021 |
| Centos_linux | — | Upgrade firefoxUpgrade thunderbird-debugsourceUpgrade thunderbirdUpgrade firefox-debuginfoUpgrade thunderbird-debuginfoUpgrade firefox-debugsource | Jan 28, 2021 | Jan 27, 2021 |
| Debian | — | Upgrade thunderbirdUpgrade firefox-esr | Jan 29, 2021 | Jan 29, 2021 |
| Gentoo Linux | — | Upgrade mail-client/thunderbird.Upgrade www-client/firefox-bin.Upgrade mail-client/thunderbird-bin.Upgrade www-client/firefox. | Feb 1, 2021 | Feb 1, 2021 |
| Mfsa2021 03 | — | Upgrade to the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox version 85.0 | Jan 27, 2021 | Jan 26, 2021 |
| Mfsa2021 04 | — | Upgrade to Mozilla Firefox ESR version 78.7Upgrade to the latest version of Mozilla Firefox | Jan 27, 2021 | Jan 26, 2021 |
| Mozilla Thunderbird | — | Upgrade to the latest version of Mozilla ThunderbirdUpgrade to Mozilla Thunderbird version 78.7 | Jan 27, 2021 | Jan 26, 2021 |
| Oracle Solaris | — | Upgrade web/data/firefox-bookmarks to version 78.8.0-11.4.31.0.1.88.4 on Solaris 11.4Upgrade mail/thunderbird to version 78.8.0-11.4.31.0.1.88.4 on Solaris 11.4Upgrade web/browser/firefox to version 78.8.0-11.4.31.0.1.88.4 on Solaris 11.4 | Mar 17, 2021 | Feb 26, 2021 |
| Oracle_linux | — | Upgrade firefoxUpgrade thunderbird | Jan 28, 2021 | Jan 26, 2021 |
| Redhat_linux | — | Upgrade firefox-debugsourceNo solution existsUpgrade firefoxUpgrade thunderbird-debugsourceUpgrade firefox-debuginfoUpgrade thunderbird-debuginfoUpgrade thunderbird | Jan 28, 2021 | Jan 27, 2021 |
| Suse | — | Upgrade MozillaThunderbird-translations-commonUpgrade MozillaThunderbirdUpgrade MozillaFirefox-translations-commonUpgrade mozillafirefox-branding-upstreamUpgrade MozillaFirefox-develUpgrade MozillaFirefoxUpgrade mozillafirefox-buildsymbolsUpgrade MozillaFirefox-translations-otherUpgrade MozillaThunderbird-translations-other | Jan 30, 2021 | Jan 27, 2021 |
| Ubuntu | — | Upgrade firefoxUpgrade thunderbird | Feb 2, 2021 | Jan 27, 2021 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jan 20, 2025 | Feb 26, 2021 |
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