Medium severity4.3NVD Advisory· Published Jun 24, 2021· Updated Jun 17, 2026
CVE-2021-29961
CVE-2021-29961
Description
When styling and rendering an oversized `` element, Firefox did not apply correct clipping which allowed an attacker to paint over the user interface. This vulnerability affects Firefox < 89.
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LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
4<89+ 1 more
- (no CPE)range: <89
- (no CPE)range: unspecified
- osv-coords2 versionspkg:rpm/opensuse/firefox-esr&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Tumbleweed
< 128.5.1-1.1+ 1 more
- (no CPE)range: < 128.5.1-1.1
- (no CPE)range: < 92.0-1.2
Patches
Vulnerability mechanics
References
3- bugzilla.mozilla.org/show_bug.cginvdBroken LinkIssue TrackingVendor Advisory
- security.gentoo.org/glsa/202107-09nvdThird Party Advisory
- www.mozilla.org/security/advisories/mfsa2021-23/nvdRelease NotesVendor Advisory
News mentions
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