A race condition when running shutdown code for Web Worker led to a use-after-free vulnerability. This resulted in a potentially exploitable crash. This vulnerability affects Firefox ESR < 68.8, Firefox < 76, and Thunderbird < 68.8.0.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade firefox-esrUpgrade librewolfUpgrade thunderbirdUpgrade mozjs68Upgrade firefox | Aug 22, 2024 | May 26, 2020 |
| Amazon Linux Ami 2 | — | Upgrade thunderbirdUpgrade thunderbird-debuginfo | May 22, 2020 | May 22, 2020 |
| Arch Linux | — | Upgrade to the latest version of Arch Linux | Jul 11, 2025 | May 26, 2020 |
| Centos_linux | — | Upgrade thunderbird-debugsourceUpgrade thunderbirdUpgrade firefoxUpgrade firefox-debuginfoUpgrade firefox-debugsourceUpgrade thunderbird-debuginfo | May 7, 2020 | May 6, 2020 |
| Debian | — | Upgrade firefox-esrUpgrade thunderbird | May 8, 2020 | May 8, 2020 |
| Gentoo Linux | — | Upgrade www-client/firefox.Upgrade www-client/firefox-bin.Upgrade mail-client/thunderbird.Upgrade mail-client/thunderbird-bin. | Jun 15, 2020 | May 26, 2020 |
| Mfsa2020 16 | — | Upgrade to the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox version 76.0 | May 6, 2020 | May 5, 2020 |
| Mfsa2020 17 | — | Upgrade to Mozilla Firefox ESR version 68.8Upgrade to the latest version of Mozilla Firefox | May 6, 2020 | May 5, 2020 |
| Mozilla Thunderbird | — | Upgrade to Mozilla Thunderbird version 68.8Upgrade to the latest version of Mozilla Thunderbird | May 6, 2020 | May 5, 2020 |
| Oracle Solaris | — | Upgrade mail/thunderbird to version 68.8.0-11.4.22.0.1.69.2 on Solaris 11.4Upgrade web/data/firefox-bookmarks to version 68.8.0-11.4.22.0.1.69.2 on Solaris 11.4Upgrade web/browser/firefox to version 68.8.0-11.4.22.0.1.69.2 on Solaris 11.4Upgrade mail/thunderbird/plugin/thunderbird-lightning to version 68.8.0-11.4.22.0.1.69.2 on Solaris 11.4 | Jan 19, 2021 | May 26, 2020 |
| Oracle_linux | — | Upgrade firefoxUpgrade thunderbird | Jun 19, 2020 | May 5, 2020 |
| Redhat_linux | — | Upgrade thunderbird-debugsourceUpgrade firefox-debugsourceUpgrade thunderbirdNo solution existsUpgrade firefox-debuginfoUpgrade firefoxUpgrade thunderbird-debuginfo | May 7, 2020 | May 6, 2020 |
| Suse | — | Upgrade MozillaThunderbird-translations-otherUpgrade mozillafirefox-buildsymbolsUpgrade MozillaThunderbirdUpgrade MozillaThunderbird-translations-commonUpgrade mozillafirefox-branding-upstreamUpgrade MozillaFirefox-translations-commonUpgrade MozillaFirefoxUpgrade MozillaFirefox-develUpgrade MozillaFirefox-translations-other | May 9, 2020 | May 7, 2020 |
| Ubuntu | — | Upgrade thunderbirdUpgrade firefox | May 8, 2020 | May 7, 2020 |
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