What’s Vulnerable › Vulnerabilities

CVE-2025-59147: Suricata is Vulnerable to Detection Bypass via Crafted Multiple SYN Packets

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-10-01 · updated 2026-10-12
• Weakness: CWE-358

Description

Suricata is a network IDS, IPS and NSM engine developed by the OISF (Open Information Security Foundation) and the Suricata community. Versions 7.0.11 and below, as well as 8.0.0, are vulnerable to detection bypass when crafted traffic sends multiple SYN packets with different sequence numbers within the same flow tuple, which can cause Suricata to fail to pick up the TCP session. In IDS mode this can lead to a detection and logging bypass. In IPS mode this will lead to the flow getting blocked. This issue is fixed in versions 7.0.12 and 8.0.1.

Affected products

• OISF suricata: before 7.0.12; 8.0.0, 8.0.0-beta1, 8.0.0-rc1 — fixed in 7.0.12

How to fix

Upgrade to a fixed version: OISF suricata 7.0.12. Check the vendor advisory for mitigations.

References

• https://forum.suricata.io/t/suricata-8-0-1-and-7-0-12-released/6018
• https://github.com/OISF/suricata/commit/be6315dba0d9101b11d16e9dacfe2822b3792f1b
• https://github.com/OISF/suricata/commit/e91b03c90385db15e21cf1a0e85b921bf92b039e
• https://github.com/OISF/suricata/security/advisories/GHSA-v8hv-6v7x-4c2r

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