Critical severity9.8NVD Advisory· Published Dec 22, 2022· Updated Jun 17, 2026

CVE-2021-4127

Description

An out of date graphics library (Angle) likely contained vulnerabilities that could potentially be exploited. This vulnerability affects Thunderbird < 78.9 and Firefox ESR < 78.9.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Mozilla Corporation/Firefoxllm-fuzzy2 versions
<78.9+ 1 more
- (no CPE)range: <78.9
- (no CPE)range: unspecified
Mozilla Corporation/Thunderbirdllm-fuzzy2 versions
<78.9+ 1 more
- (no CPE)range: <78.9
- (no CPE)range: unspecified

Patches

Vulnerability mechanics

References

bugzilla.mozilla.org/show_bug.cginvdExploitIssue TrackingPatchVendor Advisory
www.mozilla.org/security/advisories/mfsa2021-11/nvdVendor Advisory
www.mozilla.org/security/advisories/mfsa2021-12/nvdVendor Advisory

News mentions

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cvss	0.637
epss	0.001
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000