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CVE-2025-7795: Critical Stack-Based Buffer Overflow Vulnerability in Tenda FH451

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Overview

In this blog post, we will delve into the details of a critical vulnerability that has been identified in Tenda FH451 1.0.0.9. This vulnerability, which has been designated as CVE-2025-7795, affects the function fromP2pListFilter of the file /goform/P2pListFilter, and opens up potential for a stack-based buffer overflow attack. This issue is significant due to the widespread use of Tenda FH451 and the severity of the vulnerability, which could lead to a system compromise or data leakage if exploited.

Vulnerability Summary

CVE ID: CVE-2025-7795
Severity: Critical (CVSS: 8.8)
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 FH451 | 1.0.0.9

How the Exploit Works

This vulnerability stems from an insufficient bounds check in the handling of the ‘page’ argument in the fromP2pListFilter function. An attacker can exploit this vulnerability by sending a specially crafted request with an oversized ‘page’ argument. This leads to a buffer overflow condition, allowing the attacker to execute arbitrary code or cause a denial of service.

Conceptual Example Code

Here is a simplified, conceptual example demonstrating how an attacker may exploit this vulnerability.

POST /goform/P2pListFilter HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
page=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA...

In this example, the ‘page’ argument is filled with an excessive amount of ‘A’s, which could overflow the stack buffer and lead to potential execution of arbitrary code.

Remediation

Tenda has acknowledged the vulnerability and released a patch to address this issue. Users are strongly advised to update their Tenda FH451 firmware to the latest version to mitigate this vulnerability. In cases where immediate patching is not feasible, deploying a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can act as a temporary measure to detect and block exploit attempts. However, these are temporary solutions and cannot completely eliminate the vulnerability, so applying the vendor’s patch should be a priority.

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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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