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By exploiting an Open Redirect vulnerability on a website, an attacker could have spoofed the site displayed in the download file dialog to show the original site (the one suffering from the open redirect) rather than the site the file was actually downloaded from. This vulnerability affects Firefox < 81, Thunderbird < 78.3, and Firefox ESR < 78.3.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade firefoxUpgrade thunderbirdUpgrade firefox-esrUpgrade librewolf | Aug 22, 2024 | Oct 1, 2020 |
| Amazon Linux Ami 2 | — | Upgrade thunderbirdUpgrade thunderbird-debuginfo | Dec 10, 2020 | Oct 1, 2020 |
| Arch Linux | — | Upgrade to the latest version of Arch Linux | Jul 11, 2025 | Oct 1, 2020 |
| Centos_linux | — | Upgrade thunderbird-debugsourceUpgrade thunderbirdUpgrade firefoxUpgrade firefox-debuginfoUpgrade thunderbird-debuginfoUpgrade firefox-debugsource | Sep 25, 2020 | Sep 24, 2020 |
| Debian | — | Upgrade thunderbirdUpgrade firefox-esr | Sep 30, 2020 | Sep 30, 2020 |
| Gentoo Linux | — | Upgrade mail-client/thunderbird-bin.Upgrade www-client/firefox.Upgrade mail-client/thunderbird.Upgrade www-client/firefox-bin. | Oct 19, 2020 | Oct 1, 2020 |
| Mfsa2020 42 | — | Upgrade to the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox version 81.0 | Sep 23, 2020 | Sep 22, 2020 |
| Mfsa2020 43 | — | Upgrade to Mozilla Firefox ESR version 78.3Upgrade to the latest version of Mozilla Firefox | Sep 23, 2020 | Sep 22, 2020 |
| Mozilla Thunderbird | — | Upgrade to Mozilla Thunderbird version 78.3Upgrade to the latest version of Mozilla Thunderbird | Sep 25, 2020 | Sep 22, 2020 |
| Oracle Solaris | — | Upgrade web/data/firefox-bookmarks to version 78.3.0-11.4.27.0.1.82.0 on Solaris 11.4Upgrade web/browser/firefox to version 78.3.0-11.4.27.0.1.82.0 on Solaris 11.4Upgrade mail/thunderbird to version 78.3.0-11.4.27.0.1.82.0 on Solaris 11.4 | Jan 19, 2021 | Oct 1, 2020 |
| Oracle_linux | — | Upgrade firefoxUpgrade thunderbird | Sep 25, 2020 | Sep 22, 2020 |
| Redhat_linux | — | Upgrade firefox-debugsourceUpgrade firefox-debuginfoUpgrade thunderbird-debuginfoNo solution existsUpgrade thunderbird-debugsourceUpgrade thunderbirdUpgrade firefox | Sep 25, 2020 | Sep 24, 2020 |
| Suse | — | Upgrade MozillaThunderbirdUpgrade MozillaFirefox-translations-commonUpgrade MozillaFirefoxUpgrade mozilla-nsprUpgrade MozillaThunderbird-translations-otherUpgrade MozillaFirefox-translations-otherUpgrade mozilla-nspr-32bitUpgrade mozilla-nspr-develUpgrade MozillaFirefox-develUpgrade MozillaThunderbird-translations-commonUpgrade mozillafirefox-buildsymbolsUpgrade mozillafirefox-branding-upstream | Sep 29, 2020 | Sep 24, 2020 |
| Ubuntu | — | Upgrade firefox | Sep 29, 2020 | Sep 24, 2020 |
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