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CVE-2025-53538: Uncontrolled Memory Usage Vulnerability in Suricata IDS Engine

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Overview

The CVE-2025-53538 vulnerability is a critical flaw identified in Suricata, a network Intrusion Detection System (IDS), Intrusion Prevention System (IPS), and Network Security Monitoring (NSM) engine. This flaw affects versions 7.0.10 and below and 8.0.0-beta1 through 8.0.0-rc1. It can lead to uncontrolled memory usage, causing loss of visibility and potential system compromise or data leakage, thus posing a significant threat to the security of affected systems.

Vulnerability Summary

CVE ID: CVE-2025-53538
Severity: High (CVSS: 7.5)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Uncontrolled memory usage, potential system compromise, or data leakage.

Affected Products

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Product | Affected Versions

Suricata | 7.0.10 and below
Suricata | 8.0.0-beta1 through 8.0.0-rc1

How the Exploit Works

The exploit takes advantage of a mishandling of data on the HTTP2 stream 0 in the affected Suricata versions. This mishandling causes uncontrolled memory usage. An attacker sending malicious HTTP/2 frames targeting stream 0 can trigger the vulnerability, leading to loss of visibility, which could potentially result in system compromise or data leakage.

Conceptual Example Code

Given the nature of this vulnerability, a high-level conceptual example might involve delivering malicious HTTP/2 frames to the target system. Conceptually, it would look something like this:

POST / HTTP/2
Host: target.example.com
Content-Type: application/http2-frames
{ "malicious_frame": "stream0_targeted_payload" }

This conceptual code is designed to represent the method of attack rather than provide a practical example of an exploit. In a real-world scenario, the malicious_frame content would be designed to exploit the specific memory handling vulnerability in Suricata.

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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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