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CVE-2025-6112: Critical Buffer Overflow Vulnerability in Tenda FH1205

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Overview

The CVE-2025-6112 is a critical vulnerability that has been identified in the Tenda FH1205 version 2.0.0.7. This vulnerability, found in the function fromadvsetlanip of the file /goform/AdvSetLanip, could potentially lead to system compromise or data leakage. Given the function’s role in network management, numerous businesses and individual users worldwide relying on Tenda FH1205 could be at risk. Understanding this vulnerability and implementing the necessary fixes is thus paramount to ensuring the security of your network.

Vulnerability Summary

CVE ID: CVE-2025-6112
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 FH1205 | 2.0.0.7

How the Exploit Works

The exploit takes advantage of a buffer overflow vulnerability in the function fromadvsetlanip. The function is used to set the LAN IP address of the device. However, the function does not properly validate the length of the lanMask argument. An attacker can remotely send a specially crafted request with an oversized lanMask argument. The oversized argument is then copied into a fixed-size buffer, causing the buffer to overflow, which could lead to arbitrary code execution or cause the system to crash.

Conceptual Example Code

Here is a conceptual example of how the vulnerability might be exploited using an HTTP request:

POST /goform/AdvSetLanip HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
lanMask=256.256.256.256

In this example, the attacker sends a POST request with an oversized lanMask value. This oversized value overflows the buffer, leading to the potential execution of malicious code.

Mitigation

Users are urged to apply the vendor-provided patch as soon as possible. If the patch cannot be applied immediately, users should consider using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) as a temporary mitigation measure to detect and block attempts to exploit this vulnerability.

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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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