CVE-2021-20231
CRITICALCVSS 9.8/10EPSS 3.75%
Last modified
CVE-2021-20231 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. A flaw was found in gnutls. A use after free issue in client sending key_share extension may lead to memory corruption and other consequences.. EPSS estimates a 3.75% chance of exploitation in the next 30 days.
Description
A flaw was found in gnutls. A use after free issue in client sending key_share extension may lead to memory corruption and other consequences.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Gnu | Gnutls | >= 3.6.3, < 3.7.1 |
| Redhat | Enterprise Linux | 8.0 |
| Fedoraproject | Fedora | 34 |
| Netapp | Active Iq Unified Manager | All versions |
| Netapp | E-Series Performance Analyzer | All versions |
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1922276Issue Tracking, Patch, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210416-0005/Third Party Advisory
- https://www.gnutls.org/security-new.html#GNUTLS-SA-2021-03-10Exploit, Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1922276Issue Tracking, Patch, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210416-0005/Third Party Advisory
- https://www.gnutls.org/security-new.html#GNUTLS-SA-2021-03-10Exploit, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-20231?
A flaw was found in gnutls. A use after free issue in client sending key_share extension may lead to memory corruption and other consequences.
How severe is CVE-2021-20231?
CVE-2021-20231 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 3.75% probability of exploitation in the next 30 days.
How do I fix CVE-2021-20231?
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-2021-20231?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST