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Under certain conditions, when handling a ReadableStream, a race condition can cause a use-after-free. We are aware of targeted attacks in the wild abusing this flaw. This vulnerability affects Thunderbird < 68.7.0, Firefox < 74.0.1, and Firefox ESR < 68.6.1.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade librewolfUpgrade thunderbirdUpgrade firefoxUpgrade firefox-esrUpgrade mozjs68 | Aug 22, 2024 | Apr 24, 2020 |
| Amazon Linux Ami 2 | — | Upgrade thunderbirdUpgrade thunderbird-debuginfo | May 22, 2020 | Apr 24, 2020 |
| Arch Linux | — | Upgrade to the latest version of Arch Linux | Jul 11, 2025 | Apr 24, 2020 |
| Centos_linux | — | Upgrade firefox-debuginfoUpgrade firefox-debugsourceUpgrade thunderbird-debuginfoUpgrade firefoxUpgrade thunderbird-debugsourceUpgrade thunderbird | Apr 8, 2020 | Apr 7, 2020 |
| Debian | — | Upgrade thunderbirdUpgrade firefox-esr | Apr 6, 2020 | Apr 6, 2020 |
| Gentoo Linux | — | Upgrade www-client/firefox. | Apr 6, 2020 | Apr 4, 2020 |
| Mfsa2020 11 | — | Upgrade to Mozilla Firefox ESR version 68.6.1Upgrade to the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox version 74.0.1 | Apr 6, 2020 | Apr 3, 2020 |
| Mozilla Thunderbird | — | Upgrade to Mozilla Thunderbird version 68.7Upgrade to the latest version of Mozilla Thunderbird | Apr 13, 2020 | Apr 9, 2020 |
| Oracle Solaris | — | Upgrade 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 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 11.4Upgrade consolidation/userland/userland-incorporation to version 11.4-11.4.24.0.1.75.1 on Solaris 11.4 | Jan 19, 2021 | Apr 24, 2020 |
| Oracle_linux | — | Upgrade thunderbirdUpgrade firefox | Apr 11, 2020 | Apr 3, 2020 |
| Redhat_linux | — | Upgrade thunderbird-debuginfoUpgrade firefox-debugsourceUpgrade firefox-debuginfoNo solution existsUpgrade thunderbirdUpgrade firefoxUpgrade thunderbird-debugsource | Apr 8, 2020 | Apr 7, 2020 |
| Suse | — | Upgrade MozillaThunderbird-translations-otherUpgrade MozillaThunderbirdUpgrade MozillaFirefox-translations-otherUpgrade MozillaFirefox-translations-commonUpgrade MozillaFirefox-develUpgrade mozillafirefox-buildsymbolsUpgrade MozillaThunderbird-translations-commonUpgrade mozillafirefox-branding-upstreamUpgrade MozillaFirefox | Apr 7, 2020 | Apr 4, 2020 |
| Ubuntu | — | Upgrade firefoxUpgrade thunderbird | Apr 5, 2020 | Apr 4, 2020 |
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