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CVE-2025-44651: Denial of Service Vulnerability in TRENDnet TPL-430AP FW1.0

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Overview

This report details a significant vulnerability, CVE-2025-44651, impacting the TRENDnet TPL-430AP FW1.0. This vulnerability arises from the USERLIMIT_GLOBAL option being set to zero in the bftpd-related configuration file, potentially causing Denial of Service (DoS) attacks when unlimited users are connected. It is a critical issue, as it could lead to a potential system compromise or data leakage.

Vulnerability Summary

CVE ID: CVE-2025-44651
Severity: High (7.5 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise and data leakage

Affected Products

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Product | Affected Versions

TRENDnet TPL-430AP | FW1.0

How the Exploit Works

The vulnerability is exploited by a malicious actor who can send multiple connection requests to the server. As the USERLIMIT_GLOBAL option is set to 0, this allows unlimited concurrent connections from users, leading to resource exhaustion, and ultimately, a Denial of Service attack.

Conceptual Example Code

In a real-world scenario, the attacker would generate a large amount of connection requests to the server, something like the following pseudocode:

import socket
def create_connection(target_ip, target_port):
try:
socket.create_connection((target_ip, target_port))
except Exception as e:
pass
target_ip = "192.168.0.1"
target_port = 21
while True:
create_connection(target_ip, target_port)

In this example, an attacker could run this script from multiple machines, generating a significant number of connections to the server, leading to resource exhaustion and a potential Denial of Service attack.

Security Mitigation

To mitigate this vulnerability, users are advised to apply the vendor’s patch when it becomes available. In the meantime, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) could be used as a temporary mitigation measure.

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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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