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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.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade firefox-esrUpgrade librewolfUpgrade firefox | Aug 22, 2024 | Jan 8, 2020 |
| Amazon Linux Ami 2 | — | Upgrade thunderbird-debuginfoUpgrade thunderbird | Apr 27, 2020 | Jan 8, 2020 |
| Arch Linux | — | Upgrade to the latest version of Arch Linux | Jul 11, 2025 | Jan 8, 2020 |
| Centos_linux | — | Upgrade thunderbirdUpgrade firefox-debuginfoUpgrade thunderbird-debuginfoUpgrade firefoxUpgrade thunderbird-debugsourceUpgrade firefox-debugsource | Oct 25, 2019 | Oct 23, 2019 |
| Debian | — | Upgrade firefox-esrUpgrade thunderbird | Oct 28, 2019 | Oct 28, 2019 |
| Gentoo Linux | — | Upgrade mail-client/thunderbird-bin.Upgrade mail-client/thunderbird. | Mar 16, 2020 | Jan 8, 2020 |
| Mfsa2019 33 | — | Upgrade to Mozilla Firefox ESR version 68.2Upgrade to the latest version of Mozilla Firefox | Oct 23, 2019 | Oct 22, 2019 |
| Mfsa2019 34 | — | Upgrade to the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox version 70.0 | Oct 23, 2019 | Oct 22, 2019 |
| Mozilla Thunderbird | — | Upgrade to the latest version of Mozilla ThunderbirdUpgrade to Mozilla Thunderbird version 68.2 | Oct 25, 2019 | Oct 22, 2019 |
| Oracle Solaris | — | Upgrade web/browser/firefox to version 68.2.0-11.4.15.0.1.4.0 on Solaris 11.4Upgrade mail/thunderbird to version 68.2.0-11.4.15.0.1.4.0 on Solaris 11.4Upgrade web/data/firefox-bookmarks to version 68.2.0-11.4.15.0.1.4.0 on Solaris 11.4Upgrade mail/thunderbird/plugin/thunderbird-lightning to version 68.2.0-11.4.15.0.1.4.0 on Solaris 11.4 | Nov 20, 2019 | Nov 20, 2019 |
| Oracle_linux | — | Upgrade thunderbirdUpgrade firefox | Oct 30, 2019 | Oct 22, 2019 |
| Redhat_linux | — | Upgrade thunderbirdUpgrade firefox-debugsourceNo solution existsUpgrade thunderbird-debuginfoUpgrade thunderbird-debugsourceUpgrade firefox-debuginfoUpgrade firefox | Oct 25, 2019 | Oct 23, 2019 |
| Suse | — | Upgrade MozillaThunderbird-translations-otherUpgrade mozillafirefox-buildsymbolsUpgrade mozilla-nssUpgrade firefox-libcairo2Upgrade MozillaFirefox-develUpgrade firefox-glib2-toolsUpgrade MozillaFirefox-translations-otherUpgrade libfreebl3Upgrade mozillafirefox-branding-upstreamUpgrade firefox-libcairo-gobject2Upgrade firefox-gdk-pixbuf-query-loadersUpgrade mozilla-nss-certsUpgrade libfirefox-glib-2_0-0Upgrade firefox-libpango-1_0-0Upgrade firefox-libgtk-3-0Upgrade MozillaThunderbird-translations-commonUpgrade mozilla-nss-certs-32bitUpgrade firefox-gtk3-immodule-ximUpgrade libfirefox-gio-2_0-0Upgrade MozillaFirefox-branding-SLEDUpgrade firefox-gtk3-toolsUpgrade firefox-gtk3-branding-upstreamUpgrade firefox-libffi7Upgrade libsoftokn3Upgrade firefox-esr-branding-openSUSEUpgrade MozillaFirefox-branding-openSUSEUpgrade mozilla-nspr-32bitUpgrade libfirefox-gthread-2_0-0Upgrade mozilla-nss-toolsUpgrade mozillafirefox-branding-sleUpgrade firefox-gtk3-langUpgrade mozilla-nss-32bitUpgrade mozilla-nsprUpgrade firefox-gtk3-immodule-vietnameseUpgrade MozillaThunderbirdUpgrade firefox-gtk3-immodule-thaiUpgrade firefox-libatk-1_0-0Upgrade MozillaFirefox-translations-commonUpgrade firefox-gtk3-dataUpgrade MozillaFirefoxUpgrade libfreebl3-32bitUpgrade firefox-libgdk_pixbuf-2_0-0Upgrade firefox-gtk3-immodule-amharicUpgrade firefox-atk-langUpgrade firefox-gio-branding-upstreamUpgrade mozilla-nss-develUpgrade firefox-gtk3-immodule-multipressUpgrade firefox-gtk3-immodules-tigrignaUpgrade libfirefox-gmodule-2_0-0Upgrade firefox-glib2-langUpgrade firefox-gdk-pixbuf-langUpgrade firefox-gtk3-immodule-inuktitutUpgrade libfirefox-gobject-2_0-0Upgrade firefox-libharfbuzz0Upgrade firefox-gdk-pixbuf-thumbnailerUpgrade libsoftokn3-32bitUpgrade mozilla-nspr-develUpgrade firefox-libffi4 | Nov 1, 2019 | Oct 23, 2019 |
| Ubuntu | — | Upgrade thunderbirdUpgrade firefox | Oct 24, 2019 | Oct 23, 2019 |
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