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.
