CVE-2021-37592
CRITICALCVSS 9.8/10EPSS 1.55%
Last modified
CVE-2021-37592 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Suricata before 5.0.8 and 6.x before 6.0.4 allows TCP evasion via a client with a crafted TCP/IP stack that can send a certain sequence of segments.. EPSS estimates a 1.55% chance of exploitation in the next 30 days.
Description
Suricata before 5.0.8 and 6.x before 6.0.4 allows TCP evasion via a client with a crafted TCP/IP stack that can send a certain sequence of segments.
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 |
|---|---|---|
| Oisf | Suricata | < 5.0.8 |
| Oisf | Suricata | >= 6.0.0, < 6.0.4 |
References
- https://forum.suricata.io/t/suricata-6-0-4-and-5-0-8-released/1942Release Notes, Vendor Advisory
- https://github.com/OISF/suricata/releasesRelease Notes, Third Party Advisory
- https://redmine.openinfosecfoundation.org/issues/4569Permissions Required, Third Party Advisory
- https://forum.suricata.io/t/suricata-6-0-4-and-5-0-8-released/1942Release Notes, Vendor Advisory
- https://github.com/OISF/suricata/releasesRelease Notes, Third Party Advisory
- https://redmine.openinfosecfoundation.org/issues/4569Permissions Required, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-37592?
Suricata before 5.0.8 and 6.x before 6.0.4 allows TCP evasion via a client with a crafted TCP/IP stack that can send a certain sequence of segments.
How severe is CVE-2021-37592?
CVE-2021-37592 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.55% probability of exploitation in the next 30 days.
How do I fix CVE-2021-37592?
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-2021-37592?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST