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CVE-2025-7550: Critical Buffer Overflow Vulnerability in Tenda FH1201 1.2.0.14(408)

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Overview

A critical vulnerability, identified as CVE-2025-7550, has been discovered in Tenda’s FH1201 1.2.0.14(408) firmware. This vulnerability, if exploited, could potentially lead to a system compromise or data leakage. It resides in the function fromGstDhcpSetSer of the file /goform/GstDhcpSetSer and can be triggered remotely through the improper handling of the argument ‘dips. As Tenda routers are widely used, this vulnerability could potentially impact a large number of users and systems.

Vulnerability Summary

CVE ID: CVE-2025-7550
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 FH1201 | 1.2.0.14(408)

How the Exploit Works

This vulnerability is a stack-based buffer overflow issue. It occurs when the fromGstDhcpSetSer function of the /goform/GstDhcpSetSer file in the Tenda FH1201 1.2.0.14(408) firmware fails to properly validate the length of user-supplied data before copying it to a fixed-length, stack-based buffer. This flaw could allow an attacker to overwrite the buffer’s content with arbitrary malicious data, potentially leading to the execution of unauthorized code or commands.

Conceptual Example Code

An attacker could exploit this vulnerability by sending a specially crafted HTTP request that contains an oversized ‘dips’ argument. Here’s a simplified, conceptual example of how such an HTTP request might look:

POST /goform/GstDhcpSetSer HTTP/1.1
Host: vulnerable-router
Content-Type: application/x-www-form-urlencoded
dips=<malicious_payload>

In this example, “ would be a string that is long enough to overflow the stack-based buffer in the vulnerable function.

Mitigation and Prevention

Users are advised to apply the vendor-provided patch as soon as possible. If the patch cannot be applied immediately, users can protect themselves by deploying a web application firewall (WAF) or an intrusion detection system (IDS) that can detect and block attempts to exploit this vulnerability. However, these are only temporary measures and the ultimate solution is to apply the vendor’s patch.

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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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