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Vulnerability record · CVE-2021-37592 · published 19 November 2021

CVE-2021-37592: Oisf suricata out-of-bounds write vulnerability

Oisf · Suricata

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.

9.8 CVSS 3.1 Critical EPSS 1.6% · top 25.1% CWE-787 · Out-of-bounds write
9.8CVSS 3.1 base score, v2 7.5
1.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://forum.suricata.io/t/suricata-6-0-4-and-5-0-8-released/1942 Release NotesVendor Advisory
https://github.com/OISF/suricata/releases Release NotesThird Party Advisory
https://redmine.openinfosecfoundation.org/issues/4569 Permissions RequiredThird Party Advisory
https://forum.suricata.io/t/suricata-6-0-4-and-5-0-8-released/1942 Release NotesVendor Advisory
https://github.com/OISF/suricata/releases Release NotesThird Party Advisory
https://redmine.openinfosecfoundation.org/issues/4569 Permissions RequiredThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2026-22262Oisf suricata stack-based buffer overflow vulnerabilitySuricata is a network IDS, IPS and NSM engine. While saving a dataset a stack buffer is used to prepare the data. Prior to versions 8.0.3 and 7.0.14,…EPSS 0.55%9.8CVE-2023-35853Oisf suricata code injection vulnerabilityIn Suricata before 6.0.13, an adversary who controls an external source of Lua rules may be able to execute Lua code. This is addressed in 6.0.13 by …EPSS 1.0%9.8CVE-2018-10244Oisf suricata integer overflow vulnerabilitySuricata version 4.0.4 incorrectly handles the parsing of an EtherNet/IP PDU. A malformed PDU can cause the parsing code to read beyond the allocated…EPSS 1.7%9.1CVE-2026-45764Oisf suricata type confusion vulnerabilitySuricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. Prior to versions 7.0.16 and 8.…EPSS 0.63%9.1CVE-2026-22264Oisf suricata use after free vulnerabilitySuricata is a network IDS, IPS and NSM engine. Prior to version 8.0.3 and 7.0.14, an unsigned integer overflow can lead to a heap use-after-free cond…EPSS 0.40%9.1CVE-2019-18792Oisf suricata interpretation conflict vulnerabilityAn issue was discovered in Suricata 5.0.0. It is possible to bypass/evade any tcp based signature by overlapping a TCP segment with a fake FIN packet…EPSS 2.5%8.1CVE-2024-23839Oisf suricata use after free vulnerabilitySuricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. Prior to 7.0.3, specially craft…EPSS 0.78%7.5CVE-2026-45770Oisf suricata out-of-bounds write vulnerabilitySuricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. Starting in version 8.0.0 and p…EPSS 0.48%

Source: NIST National Vulnerability Database (record CVE-2021-37592), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.