CVE-2021-4127
CRITICALCVSS 9.8/10EPSS 0.90%
Last modified
CVE-2021-4127 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. An out of date graphics library (Angle) likely contained vulnerabilities that could potentially be exploited.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.. EPSS estimates a 0.90% chance of exploitation in the next 30 days.
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An out of date graphics library (Angle) likely contained vulnerabilities that could potentially be exploited.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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox Esr | < 78.9.0 |
| Mozilla | Thunderbird | < 78.9.0 |
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1691547Exploit, Issue Tracking, Patch, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-11/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-12/Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1691547Exploit, Issue Tracking, Patch, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-11/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-12/Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-4127?
An out of date graphics library (Angle) likely contained vulnerabilities that could potentially be exploited.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.
How severe is CVE-2021-4127?
CVE-2021-4127 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.90% probability of exploitation in the next 30 days.
How do I fix CVE-2021-4127?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-4127?
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Scan your code nowSource: NVD / NIST