Overview
CVE-2025-7796 is a critical security vulnerability found in Tenda FH451 1.0.0.9. This vulnerability can be exploited remotely, and it could potentially compromise the system or lead to data leakage. Any organization or individual using Tenda FH451 1.0.0.9 could be affected, making it a significant concern for enterprises and individuals alike. The vulnerability resides within the function fromPptpUserAdd of the file /goform/PPTPDClient.
Vulnerability Summary
CVE ID: CVE-2025-7796
Severity: Critical, CVSS score: 8.8
Attack Vector: Remote
Privileges Required: None
User Interaction: None
Impact: System compromise and potential data leakage
Affected Products
Escape the Surveillance Era
Most apps won’t tell you the truth.
They’re part of the problem.
Phone numbers. Emails. Profiles. Logs.
It’s all fuel for surveillance.
Ameeba Chat gives you a way out.
- • No phone number
- • No email
- • No personal info
- • Anonymous aliases
- • End-to-end encrypted
Chat without a trace.
Product | Affected Versions
Tenda FH451 | 1.0.0.9
How the Exploit Works
CVE-2025-7796 is a stack-based buffer overflow vulnerability. It occurs when a malicious user manipulates the argument Username in the fromPptpUserAdd function of the /goform/PPTPDClient file. The system does not properly handle overly large input data, causing the buffer to overflow and allowing an attacker to execute arbitrary code or crash the system.
Conceptual Example Code
The following is a conceptual example of an HTTP request that exploits this vulnerability. It sends an overly long Username parameter to the vulnerable function:
GET /goform/PPTPDClient?Username=aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa... HTTP/1.1
Host: target.example.comIn this example, the series of “a” characters is designed to overflow the buffer. The actual malicious payload would likely contain executable code that could potentially compromise the system or lead to data leakage.
Mitigation Guidance
The primary mitigation for CVE-2025-7796 is to apply the patch provided by the vendor as soon as possible. If a patch cannot be applied immediately, using a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) can provide temporary protection by detecting and blocking attempts to exploit this vulnerability. However, these measures should only be viewed as a temporary solution, and the patch should be applied as soon as feasible to ensure the system’s security.