CVE-2021-37592

CRITICALNVD 9.89.8—

9.8

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.

CVSS v3: 9.8
EG Score: 9.8(medium)
EPSS: 36.3%
KEV: Not listed

Published

November 19, 2021

Last Modified

November 21, 2024

References (6)

cve@mitrehttps://forum.suricata.io/t/suricata-6-0-4-and-5-0-8-released/1942
cve@mitrehttps://github.com/OISF/suricata/releases
cve@mitrehttps://redmine.openinfosecfoundation.org/issues/4569
af854a3a-2127-422b-91ae-364da2661108https://forum.suricata.io/t/suricata-6-0-4-and-5-0-8-released/1942
af854a3a-2127-422b-91ae-364da2661108https://github.com/OISF/suricata/releases
af854a3a-2127-422b-91ae-364da2661108https://redmine.openinfosecfoundation.org/issues/4569

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-787Out-of-bounds Write

Data Freshness Timeline

(refreshed 12× in last 7d / 20× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

2026-06-08 14:15 UTCEPSS rescore
2026-06-08 14:15 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 06:09 UTCEPSS rescore
2026-06-05 06:09 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore

Frequently asked(5)

What is CVE-2021-37592?

CVE-2021-37592 is a critical vulnerability published on November 19, 2021. 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.

When was CVE-2021-37592 disclosed?

CVE-2021-37592 was first published in the National Vulnerability Database on November 19, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-37592 actively exploited?

CVE-2021-37592 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 36.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-37592?

CVE-2021-37592 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2021-37592?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-37592, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2021-37592

📅 Published

🔄 Last Modified

🔗 References (6)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-37592?

🔗 Related CVEs(same CWE)

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Published

Last Modified

References (6)

Frequently asked(5)

Related CVEs(same CWE)