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Certain input to the CSS Sanitizer confused it, resulting in incorrect components being removed. This could have been used as a sanitizer bypass. This vulnerability affects Firefox < 84, Thunderbird < 78.6, and Firefox ESR < 78.6.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade firefox-esrUpgrade firefoxUpgrade thunderbirdUpgrade librewolf | 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-debugsourceUpgrade firefoxUpgrade thunderbirdUpgrade firefox-debuginfoUpgrade thunderbird-debuginfoUpgrade thunderbird-debugsource | Dec 21, 2020 | Dec 16, 2020 |
| Debian | — | Upgrade thunderbirdUpgrade firefox-esr | Dec 18, 2020 | Dec 18, 2020 |
| Gentoo Linux | — | Upgrade www-client/firefox-bin.Upgrade www-client/firefox.Upgrade mail-client/thunderbird-bin.Upgrade mail-client/thunderbird. | Dec 29, 2020 | Dec 23, 2020 |
| Mfsa2020 54 | — | Upgrade to the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox version 84.0 | Dec 16, 2020 | Dec 15, 2020 |
| Mfsa2020 55 | — | Upgrade to the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox ESR version 78.6 | Dec 16, 2020 | Dec 15, 2020 |
| Mozilla Thunderbird | — | Upgrade to the latest version of Mozilla ThunderbirdUpgrade to Mozilla Thunderbird version 78.6 | Dec 16, 2020 | Dec 15, 2020 |
| Oracle Solaris | — | Upgrade 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 thunderbirdUpgrade firefox | Dec 17, 2020 | Dec 15, 2020 |
| Redhat_linux | — | Upgrade thunderbird-debuginfoUpgrade firefox-debuginfoNo solution existsUpgrade firefox-debugsourceUpgrade firefoxUpgrade thunderbirdUpgrade thunderbird-debugsource | Dec 21, 2020 | Dec 16, 2020 |
| Suse | — | Upgrade MozillaFirefox-translations-otherUpgrade MozillaFirefox-develUpgrade MozillaThunderbird-translations-otherUpgrade MozillaThunderbirdUpgrade MozillaFirefoxUpgrade mozillafirefox-buildsymbolsUpgrade MozillaThunderbird-translations-commonUpgrade MozillaFirefox-translations-commonUpgrade mozillafirefox-branding-upstream | Dec 22, 2020 | Dec 15, 2020 |
| Ubuntu | — | Upgrade firefoxUpgrade thunderbird | Dec 16, 2020 | Dec 15, 2020 |
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