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CVE-2025-55603: Buffer Overflow Vulnerability in Tenda AX3 V16.03.12.10_CN

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Overview

This report provides a detailed analysis of a high-risk vulnerability, CVE-2025-55603, affecting Tenda AX3 V16.03.12.10_CN. This vulnerability, a buffer overflow, has the potential to compromise systems and leak sensitive data. It is, therefore, of significant concern to users and administrators of this product.

Vulnerability Summary

CVE ID: CVE-2025-55603
Severity: High (7.5 CVSS Score)
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

Tenda AX3 | V16.03.12.10_CN

How the Exploit Works

The CVE-2025-55603 exploit works by taking advantage of a buffer overflow vulnerability in the fromSetSysTime function of Tenda AX3 V16.03.12.10_CN. This vulnerability is triggered when large amounts of data are inputted into the ntpServer parameter, causing an overflow of the buffer and potentially leading to arbitrary code execution or system crashes.

Conceptual Example Code

Below is a conceptual example of how this vulnerability might be exploited, using a specially crafted HTTP request to the vulnerable endpoint:

POST /fromSetSysTime HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
ntpServer=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA.........................................

In this example, the ‘A’s represent an excessively large input that could overflow the buffer.

Mitigation Guidance

The most effective mitigation against this vulnerability is to apply the vendor-provided patch. If this is not immediately possible, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as a temporary mitigation measure by detecting and blocking exploit attempts. Regularly updating and patching software is crucial for maintaining a strong security posture and protecting against such vulnerabilities.

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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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