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=192.168.1.256In 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.