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By rewriting the Host: request headers using the webRequest API, a WebExtension can bypass domain restrictions through domain fronting. This would allow access to domains that share a host that are otherwise restricted. This vulnerability affects Firefox ESR < 60.3 and Firefox < 63.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade firefox-esr | Apr 16, 2019 | Feb 28, 2019 |
| Arch Linux | — | Upgrade to the latest version of Arch Linux | Jul 11, 2025 | Feb 28, 2019 |
| Centos_linux | — | Upgrade firefoxUpgrade firefox-debuginfo | Oct 27, 2018 | Oct 23, 2018 |
| Debian | — | Upgrade firefox-esr | Oct 25, 2018 | Oct 23, 2018 |
| Freebsd | — | Upgrade linux-firefoxUpgrade firefox-esrUpgrade waterfoxUpgrade linux-thunderbirdUpgrade linux-seamonkeyUpgrade libxulUpgrade seamonkeyUpgrade thunderbirdUpgrade firefox | Oct 24, 2018 | Oct 23, 2018 |
| Gentoo Linux | — | Upgrade www-client/firefox.Upgrade www-client/firefox-bin. | Nov 9, 2018 | Nov 9, 2018 |
| Huawei Euleros 2_0_sp2 | — | Upgrade firefox | Oct 4, 2019 | Feb 28, 2019 |
| Huawei Euleros 2_0_sp3 | — | Upgrade firefox | Oct 4, 2019 | Feb 28, 2019 |
| Mfsa2018 26 | — | Upgrade to the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox version 63.0 | Oct 24, 2018 | Oct 23, 2018 |
| Mfsa2018 27 | — | Upgrade to the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox ESR version 60.3 | Oct 24, 2018 | Oct 23, 2018 |
| Oracle Solaris | — | Upgrade web/browser/firefox to version 60.5.0-11.4.6.0.1.4.0 on Solaris 11.4Upgrade mail/thunderbird to version 68.6.0-11.4.21.0.1.69.0 on Solaris 11.4Upgrade mail/thunderbird/plugin/thunderbird-lightning to version 68.6.0-11.4.21.0.1.69.0 on Solaris 11.4Upgrade web/data/firefox-bookmarks to version 60.5.0-11.4.6.0.1.4.0 on Solaris 11.4 | Feb 20, 2019 | Feb 20, 2019 |
| Oracle_linux | — | Upgrade firefox | Nov 2, 2018 | Oct 23, 2018 |
| Redhat_linux | — | Upgrade firefox-debuginfoUpgrade firefox | Oct 25, 2018 | Oct 24, 2018 |
| Suse | — | Upgrade MozillaFirefox-translations-otherUpgrade MozillaFirefox-develUpgrade mozillafirefox-buildsymbolsUpgrade MozillaFirefox-translations-commonUpgrade mozillafirefox-branding-upstreamUpgrade MozillaFirefox | Oct 26, 2018 | Oct 23, 2018 |
| Ubuntu | — | Upgrade firefox | Nov 7, 2018 | Oct 23, 2018 |
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