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CVE-2025-29784: Denial-of-Service Vulnerability in NamelessMC’s Search Functionality

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Overview

This report details a high-severity vulnerability in NamelessMC, a widely-used website software for Minecraft servers. This vulnerability (CVE-2025-29784) affects versions 2.1.4 and prior, and if exploited, can lead to performance degradation and potential system compromise or data leakage. This vulnerability matters because of the widespread use of NamelessMC and the potential for attackers to exploit it, causing significant disruption.

Vulnerability Summary

CVE ID: CVE-2025-29784
Severity: High (7.5 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: Required
Impact: System performance degradation, potential denial-of-service attacks, system compromise or data leakage

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Product | Affected Versions

NamelessMC | 2.1.4 and prior

How the Exploit Works

The vulnerability stems from the lack of length validation for the ‘s’ parameter in GET requests for the forum search functionality in NamelessMC. Attackers can exploit this oversight by submitting excessively long search queries, which can degrade system performance and potentially lead to denial-of-service (DoS) attacks.

Conceptual Example Code

Below is a conceptual example of how this vulnerability might be exploited. In this case, an attacker sends a GET request with an excessively long ‘s’ parameter to the search endpoint.

GET /forum/search?s=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA... HTTP/1.1
Host: vulnerable-server.com

Note: The ‘A’s in the ‘s’ parameter represent the excessively long search query. The actual query would be much longer to cause noticeable performance degradation or a DoS attack.

Mitigation Guidance

Users of NamelessMC version 2.1.4 and prior are advised to update to version 2.2.0 where this issue has been patched. If an immediate update is not possible, implementing a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can provide temporary mitigation.

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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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