Medium severity6.1NVD Advisory· Published Jan 8, 2020· Updated Jun 17, 2026
CVE-2019-11763
CVE-2019-11763
Description
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
59cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*+ 4 more
- cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*range: <70.0
- cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*range: <68.2
- (no CPE)range: <70
- (no CPE)range: before 68.2
- (no CPE)range: before 70
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*+ 2 more
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*range: <68.2
- (no CPE)range: <68.2
- (no CPE)range: before 68.2
- cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*
- osv-coords50 versionspkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Leap%2015.0pkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Leap%2015.1pkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/MozillaFirefox-branding-openSUSE&distro=openSUSE%20Leap%2015.0pkg:rpm/opensuse/MozillaFirefox-branding-openSUSE&distro=openSUSE%20Leap%2015.1pkg:rpm/opensuse/MozillaThunderbird&distro=openSUSE%20Leap%2015.0pkg:rpm/opensuse/MozillaThunderbird&distro=openSUSE%20Leap%2015.1pkg:rpm/opensuse/MozillaThunderbird&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/firefox-esr&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/firefox-esr-branding-openSUSE&distro=openSUSE%20Leap%2015.0pkg:rpm/opensuse/firefox-esr-branding-openSUSE&distro=openSUSE%20Leap%2015.1pkg:rpm/suse/MozillaFirefox&distro=HPE%20Helion%20OpenStack%208pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Enterprise%20Storage%205pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Desktop%2012%20SP4pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Desktop%20Applications%2015pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Desktop%20Applications%2015%20SP1pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4-LTSSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP1-LTSSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP2-BCLpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP2-LTSSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP3-BCLpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP3-LTSSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP4pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP1pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP2pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP3pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP4pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP5pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Software%20Development%20Kit%2012%20SP4pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Software%20Development%20Kit%2012%20SP5pkg:rpm/suse/MozillaFirefox&distro=SUSE%20OpenStack%20Cloud%207pkg:rpm/suse/MozillaFirefox&distro=SUSE%20OpenStack%20Cloud%208pkg:rpm/suse/MozillaFirefox&distro=SUSE%20OpenStack%20Cloud%20Crowbar%208pkg:rpm/suse/MozillaFirefox-branding-SLE&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Desktop%20Applications%2015pkg:rpm/suse/MozillaFirefox-branding-SLE&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Desktop%20Applications%2015%20SP1pkg:rpm/suse/MozillaFirefox-branding-SLED&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4-LTSSpkg:rpm/suse/MozillaThunderbird&distro=SUSE%20Linux%20Enterprise%20Workstation%20Extension%2015pkg:rpm/suse/MozillaThunderbird&distro=SUSE%20Linux%20Enterprise%20Workstation%20Extension%2015%20SP1pkg:rpm/suse/firefox-atk&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4-LTSSpkg:rpm/suse/firefox-cairo&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4-LTSSpkg:rpm/suse/firefox-gdk-pixbuf&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4-LTSSpkg:rpm/suse/firefox-glib2&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4-LTSSpkg:rpm/suse/firefox-gtk3&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4-LTSSpkg:rpm/suse/firefox-harfbuzz&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4-LTSSpkg:rpm/suse/firefox-libffi&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4-LTSSpkg:rpm/suse/firefox-libffi-gcc5&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4-LTSSpkg:rpm/suse/firefox-pango&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4-LTSSpkg:rpm/suse/mozilla-nspr&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4-LTSSpkg:rpm/suse/mozilla-nss&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4-LTSS
< 68.2.0-lp150.3.71.1+ 49 more
- (no CPE)range: < 68.2.0-lp150.3.71.1
- (no CPE)range: < 68.2.0-lp151.2.18.2
- (no CPE)range: < 92.0-1.2
- (no CPE)range: < 68-lp150.3.3.1
- (no CPE)range: < 68-lp151.3.3.1
- (no CPE)range: < 68.2.1-lp150.3.54.1
- (no CPE)range: < 68.2.1-lp151.2.16.1
- (no CPE)range: < 91.1.1-1.1
- (no CPE)range: < 128.5.1-1.1
- (no CPE)range: < 68-lp150.3.3.1
- (no CPE)range: < 68-lp151.3.3.1
- (no CPE)range: < 68.2.0-109.95.2
- (no CPE)range: < 68.2.0-109.95.2
- (no CPE)range: < 68.2.0-109.95.2
- (no CPE)range: < 68.2.0-3.59.1
- (no CPE)range: < 68.2.0-3.59.1
- (no CPE)range: < 68.2.0-78.51.4
- (no CPE)range: < 68.2.0-109.95.2
- (no CPE)range: < 68.2.0-109.95.2
- (no CPE)range: < 68.2.0-109.95.2
- (no CPE)range: < 68.2.0-109.95.2
- (no CPE)range: < 68.2.0-109.95.2
- (no CPE)range: < 68.2.0-109.95.2
- (no CPE)range: < 68.2.0-109.95.2
- (no CPE)range: < 68.2.0-109.95.2
- (no CPE)range: < 68.2.0-109.95.2
- (no CPE)range: < 68.2.0-109.95.2
- (no CPE)range: < 68.2.0-109.95.2
- (no CPE)range: < 68.2.0-109.95.2
- (no CPE)range: < 68.2.0-109.95.2
- (no CPE)range: < 68.2.0-109.95.2
- (no CPE)range: < 68.2.0-109.95.2
- (no CPE)range: < 68.2.0-109.95.2
- (no CPE)range: < 68.2.0-109.95.2
- (no CPE)range: < 68-4.11.2
- (no CPE)range: < 68-4.11.2
- (no CPE)range: < 68-21.9.8
- (no CPE)range: < 68.2.1-3.58.1
- (no CPE)range: < 68.2.1-3.58.1
- (no CPE)range: < 2.26.1-2.8.4
- (no CPE)range: < 1.15.10-2.13.4
- (no CPE)range: < 2.36.11-2.8.4
- (no CPE)range: < 2.54.3-2.14.7
- (no CPE)range: < 3.10.9-2.15.3
- (no CPE)range: < 1.7.5-2.7.4
- (no CPE)range: < 3.2.1.git259-2.3.3
- (no CPE)range: < 5.3.1+r233831-14.1
- (no CPE)range: < 1.40.14-2.7.4
- (no CPE)range: < 4.21-29.6.1
- (no CPE)range: < 3.45-38.9.3
Patches
Vulnerability mechanics
References
6- security.gentoo.org/glsa/202003-10nvdThird Party Advisory
- usn.ubuntu.com/4335-1/nvdThird Party Advisory
- www.mozilla.org/security/advisories/mfsa2019-33/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2019-34/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2019-35/nvdVendor Advisory
- bugzilla.mozilla.org/show_bug.cginvdIssue TrackingPermissions Required
News mentions
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