In certain circumstances, the MCallGetProperty opcode can be emitted with unmet assumptions resulting in an exploitable use-after-free condition. This vulnerability affects Firefox < 82.0.3, Firefox ESR < 78.4.1, and Thunderbird < 78.4.2.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade mozjs78Upgrade thunderbirdUpgrade firefoxUpgrade firefox-esrUpgrade librewolf | Jan 4, 2021 | Dec 9, 2020 |
| Amazon Linux Ami 2 | — | Upgrade thunderbirdUpgrade thunderbird-debuginfo | Dec 10, 2020 | Dec 9, 2020 |
| Arch Linux | — | Upgrade to the latest version of Arch Linux | Jul 11, 2025 | Dec 9, 2020 |
| Centos_linux | — | Upgrade thunderbird-debuginfoUpgrade firefox-debugsourceUpgrade thunderbird-debugsourceUpgrade firefox-debuginfoUpgrade thunderbirdUpgrade firefox | Nov 13, 2020 | Nov 12, 2020 |
| Debian | — | Upgrade thunderbirdUpgrade firefox-esr | Nov 12, 2020 | Nov 12, 2020 |
| Gentoo Linux | — | Upgrade www-client/firefox.Upgrade www-client/firefox-bin. | Nov 12, 2020 | Nov 11, 2020 |
| Mfsa2020 49 | — | Upgrade to the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox version 82.0.3Upgrade to Mozilla Firefox ESR version 78.4.1 | Nov 10, 2020 | Nov 9, 2020 |
| Mozilla Thunderbird | — | Upgrade to Mozilla Thunderbird version 78.4.2Upgrade to the latest version of Mozilla Thunderbird | Nov 10, 2020 | Nov 9, 2020 |
| Oracle Solaris | — | Upgrade web/data/firefox-bookmarks to version 78.5.0-11.4.28.0.1.82.2 on Solaris 11.4Upgrade web/browser/firefox to version 78.5.0-11.4.28.0.1.82.2 on Solaris 11.4Upgrade mail/thunderbird to version 78.5.0-11.4.28.0.1.82.2 on Solaris 11.4Upgrade library/libmozjs-78 to version 78.11.0-11.4.39.0.1.107.0 on Solaris 11.4 | Jan 19, 2021 | Dec 9, 2020 |
| Oracle_linux | — | Upgrade firefoxUpgrade thunderbird | Nov 14, 2020 | Nov 9, 2020 |
| Redhat_linux | — | Upgrade thunderbirdUpgrade thunderbird-debugsourceUpgrade firefox-debuginfoNo solution existsUpgrade thunderbird-debuginfoUpgrade firefoxUpgrade firefox-debugsource | Nov 13, 2020 | Nov 12, 2020 |
| Suse | — | Upgrade MozillaFirefox-develUpgrade MozillaThunderbirdUpgrade MozillaFirefox-translations-commonUpgrade MozillaFirefox-translations-otherUpgrade MozillaThunderbird-translations-otherUpgrade mozillafirefox-branding-upstreamUpgrade MozillaThunderbird-translations-commonUpgrade mozillafirefox-buildsymbolsUpgrade MozillaFirefox | Nov 12, 2020 | Nov 10, 2020 |
| Ubuntu | — | Upgrade thunderbirdUpgrade firefox | Nov 11, 2020 | Nov 10, 2020 |
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