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CVE-2025-7854: Critical Vulnerability in Tenda FH451 1.0.0.9 Leading to Potential System Compromise or Data Leakage

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Overview

CVE-2025-7854 is a critical vulnerability discovered in Tenda FH451 version 1.0.0.9. This vulnerability specifically affects the function fromVirtualSer of the file /goform/VirtualSer. The flaw can be exploited remotely, thereby increasing its risk factor. It is of utmost importance due to its potential to cause system compromise or data leakage, posing a significant threat to both individual users and organizations alike.
The exploit for this vulnerability has been publicly disclosed, making devices running on Tenda FH451 1.0.0.9 an attractive target for potential attackers. Immediate action is required to mitigate the risk associated with this critical vulnerability.

Vulnerability Summary

CVE ID: CVE-2025-7854
Severity: Critical (CVSS Score: 8.8)
Attack Vector: Remote
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage

Affected Products

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Product | Affected Versions

Tenda FH451 | 1.0.0.9

How the Exploit Works

The vulnerability in Tenda FH451 1.0.0.9 manifests in the function fromVirtualSer of the file /goform/VirtualSer. By manipulating the argument page, an attacker can cause a stack-based buffer overflow. This overflow can then be used to execute arbitrary code remotely, potentially leading to system compromise or data leakage. The exploit does not require any user interaction or privileges, making it particularly dangerous.

Conceptual Example Code

The following is a conceptual example of how this vulnerability might be exploited. This HTTP request, when sent to the target host, could potentially cause a buffer overflow and execute malicious code:

POST /goform/VirtualSer HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
page=%n%n%n%n... (repeated until overflow occurs)

To mitigate the risks associated with this vulnerability, users are advised to apply the vendor patch as soon as possible. In the interim, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can provide temporary mitigation. However, these should not be considered long-term solutions in place of patching and updating the system.

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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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