Overview
A recently discovered vulnerability, CVE-2025-7505, has been classified as critical, affecting Tenda FH451 1.0.0.9 devices. This vulnerability exists within the HTTP POST Request Handler, specifically the frmL7ProtForm function of the file /goform/L7Prot. The flaw can lead to a stack-based buffer overflow, which can potentially result in system compromise or data leakage. This vulnerability is of high importance as it can be exploited remotely, and the exploit details have been disclosed to the public.
Vulnerability Summary
CVE ID: CVE-2025-7505
Severity: Critical; CVSS v3 Score: 8.8
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential for system compromise and data leakage
Affected Products
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Product | Affected Versions
Tenda FH451 | 1.0.0.9
How the Exploit Works
The vulnerability stems from the manipulation of the ‘page’ argument in the HTTP POST request handler. This manipulation triggers a stack-based buffer overflow condition. Buffer overflow situations are dangerous because they can overwrite memory values, leading to arbitrary code execution. In this case, the threat actor can potentially gain control of the system or access sensitive data.
Conceptual Example Code
Here’s a conceptual example of how the vulnerability might be exploited:
POST /goform/L7Prot HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
page=<malicious_payload>In the example above, a threat actor sends a malicious payload as the ‘page’ argument in a POST request to the vulnerable /goform/L7Prot endpoint. The “ would typically be designed to cause a buffer overflow, which could lead to system compromise or data leakage.
Remediation
The most effective remediation for this vulnerability is to apply the vendor’s patch. This patch should address the buffer overflow vulnerability and prevent any potential exploits. In the absence of a patch, or as a temporary measure, organizations can consider implementing a Web Application Firewall (WAF) or Intrusion Detection System (IDS) to identify and block attempts to exploit this vulnerability.