Overview
This blog post will examine the critical vulnerability found in Tenda AC10 16.03.10.13 routers, identified as CVE-2025-4896. This vulnerability is of significant concern due to its criticality and the potential for serious data leakage or system compromise if exploited. As the vulnerability has already been disclosed publicly, it poses an immediate threat to any network reliant on the affected Tenda router models. Cybersecurity professionals, network administrators, and anyone using a Tenda AC10 router should be aware of this vulnerability and the steps necessary to mitigate its potential impact.
Vulnerability Summary
CVE ID: CVE-2025-4896
Severity: Critical (CVSS: 8.8)
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 | 16.03.10.13
How the Exploit Works
The vulnerability lies in an unknown functionality of the file /goform/UserCongratulationsExec. By manipulating the ‘getuid’ argument, an attacker can cause a buffer overflow condition. This could potentially allow remote code execution or even system compromise. No user interaction is required to exploit this vulnerability, and the attack can be launched remotely over the internet.
Conceptual Example Code
Below is a conceptual example of how the vulnerability might be exploited. Please note this is a hypothetical example for educational purposes only.
POST /goform/UserCongratulationsExec HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "getuid": "A"*5000 }In this example, the attacker sends a specially crafted HTTP POST request to the /goform/UserCongratulationsExec endpoint on the target router. The ‘getuid’ argument is overloaded with a large amount of data (represented by ‘A’*5000), causing a buffer overflow.
Mitigation
The immediate mitigation for this vulnerability is to apply the vendor-provided patch. If the patch cannot be applied immediately, it is recommended to use a Web Application Firewall (WAF) or Intrusion Detection System (IDS) as a temporary mitigation measure. It’s also important to regularly update and patch your systems to protect against such vulnerabilities in the future. Check the vendor’s website for the latest security updates and patches.