Firefox did not block execution of scripts with incorrect MIME types when the response was intercepted and cached through a ServiceWorker. This could lead to a cross-site script inclusion vulnerability, or a Content Security Policy bypass. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.
CVSS Details
- CVSS 3.1 Base Score: 6.1
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | alpine-linux-upgrade-firefox-esralpine-linux-upgrade-firefoxalpine-linux-upgrade-thunderbirdalpine-linux-upgrade-librewolf | Jan 4, 2021 | Dec 9, 2020 | |
| Amazon Linux Ami 2 | amazon-linux-ami-2-upgrade-thunderbirdamazon-linux-ami-2-upgrade-thunderbird-debuginfo | Jan 8, 2021 | Dec 9, 2020 | |
| Arch Linux | arch-linux-upgrade-latest | Jul 11, 2025 | Dec 9, 2020 | |
| Centos_linux | — | centos-upgrade-firefoxcentos-upgrade-firefox-debuginfocentos-upgrade-firefox-debugsourcecentos-upgrade-thunderbirdcentos-upgrade-thunderbird-debuginfocentos-upgrade-thunderbird-debugsource | Dec 1, 2020 | Nov 30, 2020 |
| Debian | debian-upgrade-firefox-esrdebian-upgrade-thunderbird | Nov 20, 2020 | Nov 20, 2020 | |
| Gentoo Linux | gentoo-linux-upgrade-mail-client-thunderbirdgentoo-linux-upgrade-mail-client-thunderbird-bingentoo-linux-upgrade-www-client-firefoxgentoo-linux-upgrade-www-client-firefox-bin | Dec 7, 2020 | Dec 7, 2020 | |
| Mfsa2020 50 | mozilla-firefox-upgrade-83_0 | Nov 18, 2020 | Nov 17, 2020 | |
| Mfsa2020 51 | mozilla-firefox-esr-upgrade-78_5 | Nov 18, 2020 | Nov 17, 2020 | |
| Mozilla Thunderbird | mozilla-thunderbird-upgrade-78_5 | Nov 18, 2020 | Nov 17, 2020 | |
| Oracle Solaris | oracle-solaris-11-4-upgrade-mail-thunderbird-78-5-0-11-4-28-0-1-82-2oracle-solaris-11-4-upgrade-web-browser-firefox-78-5-0-11-4-28-0-1-82-2oracle-solaris-11-4-upgrade-web-data-firefox-bookmarks-78-5-0-11-4-28-0-1-82-2 | Jan 19, 2021 | Dec 9, 2020 | |
| Oracle_linux | — | oracle-linux-upgrade-firefoxoracle-linux-upgrade-thunderbird | Dec 1, 2020 | Nov 17, 2020 |
| Redhat_linux | no-fix-redhat-rpm-packageredhat-upgrade-firefoxredhat-upgrade-firefox-debuginforedhat-upgrade-firefox-debugsourceredhat-upgrade-thunderbirdredhat-upgrade-thunderbird-debuginforedhat-upgrade-thunderbird-debugsource | Dec 1, 2020 | Nov 30, 2020 | |
| Suse | — | suse-upgrade-mozillafirefoxsuse-upgrade-mozillafirefox-branding-upstreamsuse-upgrade-mozillafirefox-buildsymbolssuse-upgrade-mozillafirefox-develsuse-upgrade-mozillafirefox-translations-commonsuse-upgrade-mozillafirefox-translations-othersuse-upgrade-mozillathunderbirdsuse-upgrade-mozillathunderbird-translations-commonsuse-upgrade-mozillathunderbird-translations-other | Nov 25, 2020 | Nov 18, 2020 |
| Ubuntu | ubuntu-upgrade-firefoxubuntu-upgrade-thunderbird | Nov 19, 2020 | Nov 18, 2020 |
Prioritise with Active Threat Intelligence
With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.
Explore Intelligence Hub