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CVE-2025-50260: Buffer Overflow Vulnerability in Tenda AC6

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Overview

The Tenda AC6 v15.03.05.16_multi version is susceptible to a buffer overflow vulnerability in the formSetFirewallCfg function. This vulnerability, identified as CVE-2025-50260, poses serious security risks to users and businesses utilizing these products due to the potential for system compromise and data leakage.

Vulnerability Summary

CVE ID: CVE-2025-50260
Severity: High (CVSS 7.5)
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 AC6 | v15.03.05.16_multi

How the Exploit Works

The exploit works by overloading the buffer of the formSetFirewallCfg function through the firewallEn parameter. The attacker sends more data than the buffer can handle, causing it to overflow. This overflow can lead to arbitrary code execution, allowing the attacker to gain control over the system.

Conceptual Example Code

Below is a conceptual example of how an attacker might exploit this vulnerability. Please note that this example is for illustrative purposes only.

POST /formSetFirewallCfg HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
firewallEn=aAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA...

In this example, the attacker sends a POST request with an excessively long string of “A” characters as the firewallEn parameter, causing the buffer to overflow.

Mitigation Guidance

To mitigate this vulnerability, users are advised to apply the vendor’s patch once it is available. In the interim, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as a temporary mitigation measure.

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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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