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CVE-2025-8131: Critical Remote Stack-Based Buffer Overflow Vulnerability in Tenda AC20 16.03.08.05

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Overview

CVE-2025-8131 is an identified vulnerability found in Tenda AC20 16.03.08.05. This issue has been categorized as critical due to its potential to compromise systems or lead to data leakage. The vulnerability affects an unidentified functionality of the file /goform/SetStaticRouteCfg, where the manipulation of the argument list triggers a stack-based buffer overflow. This kind of attack can be remotely executed and the exploit details are already disclosed to the public, making it a critical concern for users of the affected device.
The severity of this vulnerability underscores the need for immediate action by Tenda AC20 users. If exploited successfully, cybercriminals can compromise systems, gain unauthorized access to sensitive data, and disrupt operations. Therefore, it’s vital to understand the nature of this vulnerability, its impact, and how to mitigate it.

Vulnerability Summary

CVE ID: CVE-2025-8131
Severity: Critical (8.8 CVSS Score)
Attack Vector: Remote
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage

Affected Products

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Product | Affected Versions

Tenda AC20 | 16.03.08.05

How the Exploit Works

The exploit takes advantage of an unknown function within the /goform/SetStaticRouteCfg file. By manipulating the argument list, an attacker can trigger a stack-based buffer overflow. This overflow can then overwrite critical memory areas, potentially allowing the attacker to execute arbitrary code on the system.

Conceptual Example Code

Below is a conceptual example of a malicious HTTP request that could potentially exploit this vulnerability:

POST /goform/SetStaticRouteCfg HTTP/1.1
Host: target.example.com
Content-Type: application/json
{
"argument_list": "A"*5000
}

In this example, a POST request is made to the vulnerable endpoint with an overly large “argument_list. This could trigger the buffer overflow, potentially leading to unauthorized code execution or system compromise.

Mitigation Guidance

Users are recommended to immediately apply the vendor patch once it is available. In the interim, deploying a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can provide temporary mitigation against potential attacks exploiting this vulnerability. Regularly updating and patching systems can significantly reduce the risk of such vulnerabilities being exploited.

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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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