The "Forget about this site" feature in the History pane is intended to remove all saved user data that indicates a user has visited a site. This includes removing any HTTP Strict Transport Security (HSTS) settings received from sites that use it. Due to a bug, sites on the pre-load list also have their HSTS setting removed. On the next visit to that site if the user specifies an http: URL rather than secure https: they will not be protected by the pre-loaded HSTS setting. After that visit the site's HSTS setting will be restored. This vulnerability affects Firefox < 69 and Firefox ESR < 68.1.
CVSS Details
- CVSS 3.1 Base Score: 6.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | alpine-linux-upgrade-firefox-esr | Nov 8, 2019 | Sep 27, 2019 |
| Arch Linux | arch-linux-upgrade-latest | Jul 11, 2025 | Sep 27, 2019 | |
| Centos_linux | — | centos-upgrade-firefoxcentos-upgrade-firefox-debuginfocentos-upgrade-firefox-debugsource | Sep 5, 2019 | Sep 4, 2019 |
| Debian | debian-upgrade-firefox-esr | Jul 30, 2024 | Sep 27, 2019 | |
| Freebsd | freebsd-upgrade-package-firefoxfreebsd-upgrade-package-waterfoxfreebsd-upgrade-package-seamonkeyfreebsd-upgrade-package-linux-seamonkeyfreebsd-upgrade-package-firefox-esrfreebsd-upgrade-package-linux-firefoxfreebsd-upgrade-package-libxulfreebsd-upgrade-package-thunderbirdfreebsd-upgrade-package-linux-thunderbird | Sep 4, 2019 | Sep 3, 2019 | |
| Mfsa2019 25 | mozilla-firefox-upgrade-69_0 | Sep 4, 2019 | Sep 3, 2019 | |
| Mfsa2019 26 | mozilla-firefox-esr-upgrade-68_1 | Sep 4, 2019 | Sep 3, 2019 | |
| Oracle Solaris | oracle-solaris-11-4-upgrade-mail-thunderbird-78-3-0-11-4-27-0-1-82-0oracle-solaris-11-4-upgrade-mail-thunderbird-plugin-thunderbird-lightning-68-12-0-11-4-27-0-1-82-0oracle-solaris-11-4-upgrade-web-browser-firefox-78-3-0-11-4-27-0-1-82-0oracle-solaris-11-4-upgrade-web-data-firefox-bookmarks-78-3-0-11-4-27-0-1-82-0 | Jan 19, 2021 | Sep 27, 2019 | |
| Oracle_linux | — | oracle-linux-upgrade-firefox | Jul 21, 2020 | Sep 3, 2019 |
| Redhat_linux | redhat-upgrade-firefoxredhat-upgrade-firefox-debuginforedhat-upgrade-firefox-debugsource | Sep 5, 2019 | Sep 4, 2019 | |
| Suse | — | suse-upgrade-firefox-atk-langsuse-upgrade-firefox-gdk-pixbuf-langsuse-upgrade-firefox-gdk-pixbuf-query-loaderssuse-upgrade-firefox-gdk-pixbuf-thumbnailersuse-upgrade-firefox-gio-branding-upstreamsuse-upgrade-firefox-glib2-langsuse-upgrade-firefox-glib2-toolssuse-upgrade-firefox-gtk3-branding-upstreamsuse-upgrade-firefox-gtk3-datasuse-upgrade-firefox-gtk3-immodule-amharicsuse-upgrade-firefox-gtk3-immodule-inuktitutsuse-upgrade-firefox-gtk3-immodule-multipresssuse-upgrade-firefox-gtk3-immodule-thaisuse-upgrade-firefox-gtk3-immodule-vietnamesesuse-upgrade-firefox-gtk3-immodule-ximsuse-upgrade-firefox-gtk3-immodules-tigrignasuse-upgrade-firefox-gtk3-langsuse-upgrade-firefox-gtk3-toolssuse-upgrade-firefox-libatk-1_0-0suse-upgrade-firefox-libcairo-gobject2suse-upgrade-firefox-libcairo2suse-upgrade-firefox-libffi4suse-upgrade-firefox-libffi7suse-upgrade-firefox-libgdk_pixbuf-2_0-0suse-upgrade-firefox-libgtk-3-0suse-upgrade-firefox-libharfbuzz0suse-upgrade-firefox-libpango-1_0-0suse-upgrade-libfirefox-gio-2_0-0suse-upgrade-libfirefox-glib-2_0-0suse-upgrade-libfirefox-gmodule-2_0-0suse-upgrade-libfirefox-gobject-2_0-0suse-upgrade-libfirefox-gthread-2_0-0suse-upgrade-libfreebl3suse-upgrade-libfreebl3-32bitsuse-upgrade-libsoftokn3suse-upgrade-libsoftokn3-32bitsuse-upgrade-mozilla-nsprsuse-upgrade-mozilla-nspr-32bitsuse-upgrade-mozilla-nspr-develsuse-upgrade-mozilla-nsssuse-upgrade-mozilla-nss-32bitsuse-upgrade-mozilla-nss-certssuse-upgrade-mozilla-nss-certs-32bitsuse-upgrade-mozilla-nss-develsuse-upgrade-mozilla-nss-toolssuse-upgrade-mozillafirefoxsuse-upgrade-mozillafirefox-branding-slesuse-upgrade-mozillafirefox-branding-sledsuse-upgrade-mozillafirefox-branding-upstreamsuse-upgrade-mozillafirefox-buildsymbolssuse-upgrade-mozillafirefox-develsuse-upgrade-mozillafirefox-translations-commonsuse-upgrade-mozillafirefox-translations-other | Oct 8, 2019 | Sep 3, 2019 |
| Ubuntu | ubuntu-upgrade-firefox | Sep 5, 2019 | Sep 3, 2019 |
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