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CVE-2025-7805: Critical Vulnerability in Tenda FH451 1.0.0.9 Leading to Remote Buffer Overflow Attacks

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Overview

A critical cybersecurity vulnerability, CVE-2025-7805, has been identified in Tenda FH451 1.0.0.9. This vulnerability has the potential to impact any organization or user operating this version of the product, posing a significant risk to sensitive data and system integrity. The issue resides in the fromPptpUserSetting function of the file /goform/PPTPUserSetting, which can be exploited to initiate stack-based buffer overflow attacks remotely. Given its severity and potential for remote exploitation, this vulnerability demands immediate attention and remediation.

Vulnerability Summary

CVE ID: CVE-2025-7805
Severity: Critical, CVSS Score 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

The vulnerability stems from the manipulation of the “delno” argument in the fromPptpUserSetting function. Insecure handling of this argument allows an attacker to overflow the stack buffer, corrupting data and potentially overwriting the return pointer or function pointers to redirect execution to the attacker’s code. This could lead to unauthorized access, system compromise, and data leakage.

Conceptual Example Code

The following is a conceptual representation of how an HTTP request exploiting this vulnerability could look:

POST /goform/PPTPUserSetting HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
delno=%cc%x90x90x90...[more malicious shell code]

The above payload represents a buffer overflow attack where “%cc%” might be used to overwrite the return pointer, and “x90x90x90…” could be a NOP sled leading to the malicious shellcode.

Mitigation

It is crucial for users of Tenda FH451 1.0.0.9 to apply the vendor patch as soon as possible to fix this vulnerability. In the absence of a patch, or until it can be applied, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can be used as temporary mitigation measures. These systems should be configured to monitor and block any suspicious activity related to the /goform/PPTPUserSetting endpoint. The CVE’s criticality and its public disclosure underscore the urgency of these remediation steps.

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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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