CVE-2021-29985
HIGHCVSS 8.8/10EPSS 1.45%
Last modified
CVE-2021-29985 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. A use-after-free vulnerability in media channels could have led to memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 78.13, Thunderbird < 91, Firefox ESR < 78.13, and Firefox < 91.. EPSS estimates a 1.45% chance of exploitation in the next 30 days.
Description
A use-after-free vulnerability in media channels could have led to memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 78.13, Thunderbird < 91, Firefox ESR < 78.13, and Firefox < 91.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | < 91.0 |
| Mozilla | Firefox Esr | < 78.13.0 |
| Mozilla | Thunderbird | < 78.13.0 |
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1722083Exploit, Issue Tracking, Vendor Advisory
- https://security.gentoo.org/glsa/202202-03Third Party Advisory
- https://security.gentoo.org/glsa/202208-14Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-33/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-34/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-35/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-36/Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1722083Exploit, Issue Tracking, Vendor Advisory
- https://security.gentoo.org/glsa/202202-03Third Party Advisory
- https://security.gentoo.org/glsa/202208-14Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-33/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-34/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-35/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-36/Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-29985?
A use-after-free vulnerability in media channels could have led to memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 78.13, Thunderbird < 91, Firefox ESR < 78.13, and Firefox < 91.
How severe is CVE-2021-29985?
CVE-2021-29985 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 1.45% probability of exploitation in the next 30 days.
How do I fix CVE-2021-29985?
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-2021-29985?
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Scan your code nowSource: NVD / NIST