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CVE-2025-7793: Critical Vulnerability in Tenda FH451 Leading to System Compromise

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Overview

A critical vulnerability, identified as CVE-2025-7793, has been discovered in Tenda FH451 1.0.0.9. This vulnerability lies in the function formWebTypeLibrary of the file /goform/webtypelibrary. It can be exploited remotely, putting a vast number of systems at risk. This vulnerability is of particular concern because it has been disclosed to the public, potentially attracting malicious actors who could exploit it to compromise systems and leak sensitive data.

Vulnerability Summary

CVE ID: CVE-2025-7793
Severity: Critical (8.8 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Can lead to system compromise and potential data leakage

Affected Products

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Product | Affected Versions

Tenda FH451 | 1.0.0.9

How the Exploit Works

The vulnerability is a stack-based buffer overflow that is triggered by manipulating the webSiteId argument in the formWebTypeLibrary function. An attacker can send a specially crafted request to the vulnerable function, causing the system to overflow its stack buffer. This can allow the attacker to execute arbitrary code or crash the system, leading to a potential system compromise.

Conceptual Example Code

Here’s a conceptual example of how an HTTP request exploiting this vulnerability might look. This is not a real exploit, but a simplified representation to help understand the vulnerability.

POST /goform/webtypelibrary HTTP/1.1
Host: target_ip
Content-Type: application/x-www-form-urlencoded
webSiteId=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA...

In this example, the ‘A’s represent an overly long string that is designed to overflow the buffer.

Countermeasures

The most effective countermeasure for this vulnerability is to apply the patch provided by the vendor. If the patch cannot be applied immediately, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can help mitigate the risk temporarily by blocking or alerting on traffic that appears to be exploiting this vulnerability. However, these are only temporary solutions, and the patch should be applied as soon as practicable to fully secure the system.

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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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