Failure to correctly handle null bytes when processing HTML entities resulted in Firefox incorrectly parsing these entities. This could have led to HTML comment text being treated as HTML which could have led to XSS in a web application under certain conditions. It could have also led to HTML entities being masked from filters - enabling the use of entities to mask the actual characters of interest from filters. This vulnerability affects Firefox < 70, Thunderbird < 68.2, and Firefox ESR < 68.2.
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-librewolf | Aug 22, 2024 | Jan 8, 2020 | |
| Amazon Linux Ami 2 | amazon-linux-ami-2-upgrade-thunderbirdamazon-linux-ami-2-upgrade-thunderbird-debuginfo | Apr 27, 2020 | Jan 8, 2020 | |
| Arch Linux | arch-linux-upgrade-latest | Jul 11, 2025 | Jan 8, 2020 | |
| Centos_linux | — | centos-upgrade-firefoxcentos-upgrade-firefox-debuginfocentos-upgrade-firefox-debugsourcecentos-upgrade-thunderbirdcentos-upgrade-thunderbird-debuginfocentos-upgrade-thunderbird-debugsource | Oct 25, 2019 | Oct 23, 2019 |
| Debian | debian-upgrade-firefox-esrdebian-upgrade-thunderbird | Oct 28, 2019 | Oct 28, 2019 | |
| Gentoo Linux | gentoo-linux-upgrade-mail-client-thunderbirdgentoo-linux-upgrade-mail-client-thunderbird-bin | Mar 16, 2020 | Jan 8, 2020 | |
| Mfsa2019 33 | mozilla-firefox-esr-upgrade-68_2 | Oct 23, 2019 | Oct 22, 2019 | |
| Mfsa2019 34 | mozilla-firefox-upgrade-70_0 | Oct 23, 2019 | Oct 22, 2019 | |
| Mozilla Thunderbird | mozilla-thunderbird-upgrade-68_2 | Oct 25, 2019 | Oct 22, 2019 | |
| Oracle Solaris | oracle-solaris-11-4-upgrade-mail-thunderbird-68-2-0-11-4-15-0-1-4-0oracle-solaris-11-4-upgrade-mail-thunderbird-plugin-thunderbird-lightning-68-2-0-11-4-15-0-1-4-0oracle-solaris-11-4-upgrade-web-browser-firefox-68-2-0-11-4-15-0-1-4-0oracle-solaris-11-4-upgrade-web-data-firefox-bookmarks-68-2-0-11-4-15-0-1-4-0 | Nov 20, 2019 | Nov 20, 2019 | |
| Oracle_linux | — | oracle-linux-upgrade-firefoxoracle-linux-upgrade-thunderbird | Oct 30, 2019 | Oct 22, 2019 |
| Redhat_linux | redhat-upgrade-firefoxredhat-upgrade-firefox-debuginforedhat-upgrade-firefox-debugsourceredhat-upgrade-thunderbirdredhat-upgrade-thunderbird-debuginforedhat-upgrade-thunderbird-debugsource | Oct 25, 2019 | Oct 23, 2019 | |
| Suse | — | suse-upgrade-firefox-atk-langsuse-upgrade-firefox-esr-branding-opensusesuse-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-opensusesuse-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-othersuse-upgrade-mozillathunderbirdsuse-upgrade-mozillathunderbird-translations-commonsuse-upgrade-mozillathunderbird-translations-other | Nov 1, 2019 | Oct 23, 2019 |
| Ubuntu | ubuntu-upgrade-firefoxubuntu-upgrade-thunderbird | Oct 24, 2019 | Oct 23, 2019 |
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