Medium severity6.5NVD Advisory· Published Feb 26, 2021· Updated Jun 17, 2026
CVE-2021-23975
CVE-2021-23975
Description
The developer page about:memory has a Measure function for exploring what object types the browser has allocated and their sizes. When this function was invoked we incorrectly called the sizeof function, instead of using the API method that checks for invalid pointers. This vulnerability affects Firefox < 86.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
5< 86+ 2 more
- (no CPE)range: < 86
- (no CPE)range: <86
- cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*range: <86.0
- osv-coords2 versionspkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/firefox-esr&distro=openSUSE%20Tumbleweed
< 92.0-1.2+ 1 more
- (no CPE)range: < 92.0-1.2
- (no CPE)range: < 128.5.1-1.1
Patches
Vulnerability mechanics
References
3- bugzilla.mozilla.org/show_bug.cginvdIssue TrackingPermissions RequiredVendor Advisory
- security.gentoo.org/glsa/202104-10nvdThird Party Advisory
- www.mozilla.org/security/advisories/mfsa2021-07/nvdRelease NotesVendor Advisory
News mentions
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