# CVE-2021-37592: suricata: Suricata before 5.0.8 and 6.x before 6.0.4 allows TCP evasion via a clientwith a crafted TCP/IP stack that can send a...

CVE-2021-37592 is fixed in suricata on 1 platform, first by DEBIAN-CVE-2021-37592, released November 19, 2021. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2021-37592
- Priority: High
- CVSS: 9.8 (Medium)
- EPSS: 0.0160
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Nov 19, 2021

## Description

Suricata before 5.0.8 and 6.x before 6.0.4 allows TCP evasion via a clientwith a crafted TCP/IP stack that can send a certain sequence of segments.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | suricata Debian 13.5 (trixie) | 1:6.0.4-1 | [DEBIAN-CVE-2021-37592](https://patchblox.com/security/data/fix/linux/debian-cve-2021-37592.md) | Nov 19, 2021 |
| Linux | suricata Debian 14 | 1:6.0.4-1 | [DEBIAN-CVE-2021-37592](https://patchblox.com/security/data/fix/linux/debian-cve-2021-37592.md) | Nov 19, 2021 |
| Linux | suricata Ubuntu 24.10 (oracular) | 1:6.0.4-1 | [suricata 1:6.0.4-1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-suricata-1-6.0.4-1.md) | Jan 16, 2026 |
| Linux | suricata Ubuntu 25.04 (plucky) | 1:6.0.4-1 | [suricata 1:6.0.4-1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-suricata-1-6.0.4-1.md) | Jan 16, 2026 |

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Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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