CVE-2025-50652: D-Link DI-8003 Path Traversal Vulnerability

CVE-2025-50652 Overview

CVE-2025-50652 is a vulnerability affecting the D-Link DI-8003 router with firmware version 16.07.26A1. The vulnerability relates to improper handling of the id parameter in the /saveparm_usb.asp endpoint. This flaw in the device's web management interface could potentially allow attackers to exploit the improper input validation to affect device operation or security.

Critical Impact

Network devices such as routers are critical infrastructure components. Improper parameter handling vulnerabilities in web management interfaces may allow attackers to manipulate device behavior or potentially gain unauthorized access to the device.

Affected Products

• D-Link DI-8003 with firmware version 16.07.26A1

Discovery Timeline

• 2026-04-08 - CVE-2025-50652 published to NVD
• 2026-04-08 - Last updated in NVD database

Technical Details for CVE-2025-50652

Vulnerability Analysis

This vulnerability exists within the D-Link DI-8003 router's web management interface, specifically in how the /saveparm_usb.asp endpoint processes the id parameter. The device fails to properly validate or sanitize user-supplied input to this parameter, which could lead to unexpected behavior or security issues.

The D-Link DI-8003 is a network router commonly deployed in small office and home environments. Web management interfaces on such devices are particularly sensitive attack surfaces because they directly control device configuration and operation.

Root Cause

The root cause of CVE-2025-50652 is improper input validation of the id parameter within the /saveparm_usb.asp endpoint. When user-controlled input is not properly validated before being processed by the application, it can lead to various security issues depending on how that input is subsequently used by the system.

Attack Vector

The attack vector for this vulnerability involves sending specially crafted requests to the /saveparm_usb.asp endpoint with a malicious id parameter value. To exploit this vulnerability, an attacker would typically need network access to the device's web management interface.

The vulnerability mechanism involves manipulating the id parameter in HTTP requests to the affected endpoint. Technical details and proof-of-concept information may be available in the GitHub IoT Vulnerability Collection. Administrators should also consult the D-Link Security Bulletin for official vendor guidance.

Detection Methods for CVE-2025-50652

Indicators of Compromise

• Unusual HTTP requests targeting /saveparm_usb.asp with abnormal id parameter values
• Unexpected configuration changes on the D-Link DI-8003 device
• Anomalous traffic patterns originating from or directed at the router's management interface

Detection Strategies

• Monitor web server logs for requests to /saveparm_usb.asp with suspicious or malformed id parameters
• Implement network intrusion detection rules to identify potential exploitation attempts targeting D-Link router management endpoints
• Deploy web application firewall rules to filter malicious requests to known vulnerable endpoints

Monitoring Recommendations

• Enable comprehensive logging on the D-Link DI-8003 web management interface if supported
• Monitor network traffic to and from the router management interface for anomalies
• Implement alerting for any unauthorized access attempts to the device's administrative interface

How to Mitigate CVE-2025-50652

Immediate Actions Required

• Restrict access to the D-Link DI-8003 web management interface to trusted IP addresses only
• Disable remote management access if not required for operations
• Ensure the device is isolated on a management VLAN or network segment with restricted access
• Check the D-Link Security Bulletin for updated firmware or security patches

Patch Information

Administrators should monitor the D-Link Security Bulletin for official patches or firmware updates addressing this vulnerability. Apply any available security updates as soon as they are released by the vendor.

Workarounds

• Implement firewall rules to restrict access to the router's web management interface from untrusted networks
• Consider using an external firewall or access control device to filter traffic to the vulnerable endpoint
• If the device supports it, disable the affected USB parameter functionality until a patch is available

# Example: Restrict management interface access via upstream firewall
# Block external access to the D-Link management port (typically 80/443)
iptables -A FORWARD -d <ROUTER_IP> -p tcp --dport 80 -j DROP
iptables -A FORWARD -d <ROUTER_IP> -p tcp --dport 443 -j DROP

# Allow management only from trusted admin workstation
iptables -I FORWARD -s <ADMIN_IP> -d <ROUTER_IP> -p tcp --dport 80 -j ACCEPT
iptables -I FORWARD -s <ADMIN_IP> -d <ROUTER_IP> -p tcp --dport 443 -j ACCEPT