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CVE-2025-7528: Critical Buffer Overflow Vulnerability in Tenda FH1202 1.2.0.14(408)

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Overview

The cybersecurity landscape is constantly evolving with new vulnerabilities being discovered daily. One such critical vulnerability has been found in the Tenda FH1202 1.2.0.14(408) router model, specifically within the /goform/GstDhcpSetSer file. This vulnerability is considered critical due to its potential for remote code execution, which could lead to system compromise or data leakage. The router’s wide usage in both home and business environments underlines the severity of this vulnerability and its potential for widespread damage.

Vulnerability Summary

CVE ID: CVE-2025-7528
Severity: Critical, CVSS Severity 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 FH1202 | 1.2.0.14(408)

How the Exploit Works

The vulnerability lies in the function fromGstDhcpSetSer of the file /goform/GstDhcpSetSer. The manipulation of the argument ‘dips’ leads to a stack-based buffer overflow. This overflow can result in the execution of arbitrary code due to the corruption of critical data structures. As it is possible to launch the exploit remotely, an attacker can compromise the system without requiring any user interaction.

Conceptual Example Code

A conceptual example demonstrating the exploitation of this vulnerability could look like this:

POST /goform/GstDhcpSetSer HTTP/1.1
Host: target_router_ip
Content-Type: application/x-www-form-urlencoded
dips=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA...

In the above example, the ‘dips’ argument is manipulated with a long string of ‘A’s causing a buffer overflow.

Mitigation

Tenda has released a patch to address this vulnerability. Users are strongly urged to update their devices to the latest firmware version as soon as possible. For temporary mitigation, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can be used to detect and prevent attempts to exploit this vulnerability. However, these are not long-term solutions, and the device’s firmware should be updated as soon as feasible.

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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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