When an extension with the proxy permission registered to receive <all_urls>, the proxy.onRequest callback was not triggered for view-source URLs. While web content cannot navigate to such URLs, a user opening View Source could have inadvertently leaked their IP address. 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 thunderbirdUpgrade firefoxUpgrade librewolf | Jan 19, 2021 | Jan 7, 2021 |
| Amazon Linux Ami 2 | — | Upgrade thunderbird-debuginfoUpgrade thunderbird | 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 thunderbird-debuginfoUpgrade thunderbirdUpgrade firefox-debuginfoUpgrade firefoxUpgrade thunderbird-debugsourceUpgrade firefox-debugsource | Dec 21, 2020 | Dec 16, 2020 |
| Debian | — | Upgrade firefox-esrUpgrade thunderbird | Dec 18, 2020 | Dec 18, 2020 |
| Gentoo Linux | — | Upgrade www-client/firefox.Upgrade mail-client/thunderbird-bin.Upgrade mail-client/thunderbird.Upgrade www-client/firefox-bin. | Dec 29, 2020 | Dec 23, 2020 |
| Mfsa2020 54 | — | Upgrade to Mozilla Firefox version 84.0Upgrade to the latest version of Mozilla Firefox | Dec 16, 2020 | Dec 15, 2020 |
| Mfsa2020 55 | — | Upgrade to Mozilla Firefox ESR version 78.6Upgrade to the latest version of Mozilla Firefox | Dec 16, 2020 | Dec 15, 2020 |
| Mozilla Thunderbird | — | Upgrade to Mozilla Thunderbird version 78.6Upgrade to the latest version of Mozilla Thunderbird | 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 firefoxUpgrade thunderbird | Dec 17, 2020 | Dec 15, 2020 |
| Redhat_linux | — | Upgrade firefox-debuginfoUpgrade thunderbird-debugsourceUpgrade thunderbirdNo solution existsUpgrade thunderbird-debuginfoUpgrade firefox-debugsourceUpgrade firefox | Dec 21, 2020 | Dec 16, 2020 |
| Suse | — | Upgrade MozillaThunderbirdUpgrade mozillafirefox-branding-upstreamUpgrade MozillaFirefox-develUpgrade MozillaFirefox-translations-commonUpgrade mozillafirefox-buildsymbolsUpgrade MozillaFirefox-translations-otherUpgrade MozillaFirefoxUpgrade MozillaThunderbird-translations-otherUpgrade MozillaThunderbird-translations-common | Dec 22, 2020 | Dec 15, 2020 |
| Ubuntu | — | Upgrade firefoxUpgrade thunderbird | Dec 16, 2020 | Dec 15, 2020 |
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