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CVE-2025-59150: Segmentation Fault Vulnerability in Suricata 8.0.0

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Overview

This report focuses on the CVE-2025-59150 vulnerability found in Suricata 8.0.0, a network Intrusion Detection System (IDS), Intrusion Prevention System (IPS), and Network Security Monitoring (NSM) engine. The software is widely used for network monitoring and security, making this vulnerability significant to numerous organizations. The issue lies in the engine’s usage of the tls.subjectaltname keyword, which can lead to a segmentation fault in certain conditions.

Vulnerability Summary

CVE ID: CVE-2025-59150
Severity: High (CVSS: 7.5)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage

Affected Products

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Product | Affected Versions

Suricata | 8.0.0

How the Exploit Works

The vulnerability stems from Suricata’s handling of the tls.subjectaltname keyword. A segmentation fault can occur when the decoded subjectaltname contains a NULL byte. An attacker can exploit this vulnerability remotely, without user interaction, by sending specially crafted network packets that trigger the segmentation fault, potentially leading to system compromise or data leakage.

Conceptual Example Code

Here’s a conceptual example of a malicious network packet that an attacker might use to exploit this vulnerability.

POST /suricata/endpoint HTTP/1.1
Host: target.example.com
Content-Type: application/tls
{ "subjectaltname": "malicious\x00payload" }

In this example, the malicious payload contains a NULL byte (\x00), triggering the segmentation fault in Suricata 8.0.0.

Mitigation Guidance

Organizations are urged to apply the vendor patch by upgrading to Suricata 8.0.1 where this issue has been fixed. If upgrading isn’t immediately feasible, as a temporary mitigation, disable rules using the tls.subjectaltname keyword or employ a Web Application Firewall (WAF) or IDS.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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