CVE-2021-37592

Critical

Published: 19 November 2021

Published

19 November 2021

Modified

21 November 2024

KEV Added

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Patch

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CVSS Score v3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Score 0.0016 36.4th percentile

Risk Priority 20 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-37592 is a critical-severity Out-of-bounds Write (CWE-787) vulnerability in Oisf Suricata. Its CVSS base score is 9.8 (Critical).

Operationally, ranked at the 36.4th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

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.

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

oisf

suricata

≤ 5.0.8 · 6.0.0 — 6.0.4

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

addresses: CWE-787

Out-of-bounds writes that corrupt control flow or inject shellcode are rendered non-executable by the same memory protections.

https://forum.suricata.io/t/suricata-6-0-4-and-5-0-8-released/1942
Release Notes, Vendor Advisory · cve@mitre.org
https://github.com/OISF/suricata/releases
Release Notes, Third Party Advisory · cve@mitre.org
https://redmine.openinfosecfoundation.org/issues/4569
Permissions Required, Third Party Advisory · cve@mitre.org
https://forum.suricata.io/t/suricata-6-0-4-and-5-0-8-released/1942
Release Notes, Vendor Advisory · af854a3a-2127-422b-91ae-364da2661108
https://github.com/OISF/suricata/releases
Release Notes, Third Party Advisory · af854a3a-2127-422b-91ae-364da2661108
https://redmine.openinfosecfoundation.org/issues/4569
Permissions Required, Third Party Advisory · af854a3a-2127-422b-91ae-364da2661108