Overview

This report discusses a significant cybersecurity vulnerability, CVE-2025-59147, affecting Suricata, a widely-used network intrusion detection system (IDS), intrusion prevention system (IPS), and network security monitoring engine. This vulnerability could potentially lead to system compromise or data leakage, posing a severe threat to any business or organization using the affected versions of Suricata.

Vulnerability Summary

CVE ID: CVE-2025-59147
Severity: High (CVSS: 7.5)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise, data leakage, and potential for detection and logging bypass.

Affected Products

Product | Affected Versions

Suricata | 7.0.11 and below
Suricata | 8.0.0

How the Exploit Works

The exploit operates by sending multiple SYN packets with varying sequence numbers within the same flow tuple. Suricata’s detection mechanism fails to properly recognize this as a single TCP session, leading to potential bypass of detection and logging in IDS mode. In IPS mode, this can result in the flow being erroneously blocked.

Conceptual Example Code

While the specific exploit wouldn’t involve an HTTP request or shell command, the logic of the vulnerability can be conceptually illustrated with pseudocode:

FOR i = 1 to n DO
SEND_SYN_PACKET(sequence_number = i)
ENDFOR

This pseudocode represents the sending of multiple SYN packets with different sequence numbers. The Suricata system treats these as separate sessions, leading to the bypass vulnerability.

Workarounds and Mitigation

Users are advised to apply the vendor’s patches provided in versions 7.0.12 and 8.0.1. If that is not immediately feasible, deploying a web application firewall (WAF) or an IDS can serve as a temporary mitigation measure. However, for long-term security, users should aim to update their Suricata installations as soon as possible.