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CVE-2025-5629: Critical Buffer Overflow Vulnerability in Tenda AC10

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Overview

A critical vulnerability has been discovered in Tenda AC10 routers, affecting versions up to 15.03.06.47, that could potentially compromise the entire system or lead to data leakage. This vulnerability, identified as CVE-2025-5629, pertains to a buffer overflow condition caused by the manipulation of the `startIp/endIp` arguments in the `formSetPPTPServer` function of `/goform/SetPptpServerCfg` file in the HTTP Handler component. Given the widespread use of Tenda AC10 routers, the impact of this vulnerability is extensive and its mitigation is of paramount importance.

Vulnerability Summary

CVE ID: CVE-2025-5629
Severity: Critical (8.8 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 AC10 | Up to 15.03.06.47

How the Exploit Works

The exploit takes advantage of a buffer overflow condition in the HTTP Handler component of the Tenda AC10 routers. This is achieved by sending specially crafted HTTP requests with manipulated `startIp/endIp` arguments to the `formSetPPTPServer` function of the `/goform/SetPptpServerCfg` file. The buffer overflow condition can lead to unexpected behavior, including system crashes, arbitrary code execution, or even a complete system takeover, thereby potentially compromising user’s data.

Conceptual Example Code

Here’s a conceptual example of an HTTP request that could exploit this vulnerability:

POST /goform/SetPptpServerCfg HTTP/1.1
Host: target.tenda.router
Content-Type: application/x-www-form-urlencoded
startIp=192.168.1.1&endIp=192.168.1.256

In this example, the `endIp` is set to `192.168.1.256`, which is an invalid IP address, causing a buffer overflow in the handling function.

Recommended Mitigations

Users are strongly advised to apply the patch provided by the vendor to mitigate this vulnerability. In case the patch cannot be applied immediately, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as temporary mitigation. Additionally, it is recommended to disable remote management features if they are not required and regularly update and patch all software to prevent exploitation of known 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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