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tcp: multiple different syn packets in a single flow can lead to detection bypass

High
victorjulien published GHSA-v8hv-6v7x-4c2r Sep 30, 2025

Package

suricata

Affected versions

<7.0.12, 8.0.0

Patched versions

7.0.12, 8.0.1

Description

Impact

Crafted traffic sending multiple SYN packets with different sequence numbers within the same flow tuple can cause Suricata to not pickup 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.

Patches

Upgrade to 7.0.12 or 8.0.1.

Workarounds

None

References

https://redmine.openinfosecfoundation.org/issues/7657

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

CVE ID

CVE-2025-59147

Weaknesses

Incomplete Model of Endpoint Features

A product acts as an intermediary or monitor between two or more endpoints, but it does not have a complete model of an endpoint's features, behaviors, or state, potentially causing the product to perform incorrect actions based on this incomplete model. Learn more on MITRE.

Credits