CVE-2025-50650: D-Link DI-8003 Buffer Overflow Vulnerability

CVE-2025-50650 Overview

A buffer overflow vulnerability exists in D-Link DI-8003 router firmware version 16.07.26A1 due to inadequate validation of input size in the routes_static parameter within the /router.asp endpoint. This firmware vulnerability allows attackers to potentially overflow memory buffers by submitting oversized input data, which could lead to device crashes or potentially arbitrary code execution on the affected network device.

Critical Impact

Attackers can exploit improper input validation in the D-Link DI-8003 router's web interface to trigger a buffer overflow condition, potentially compromising network infrastructure security.

Affected Products

• D-Link DI-8003 firmware version 16.07.26A1

Discovery Timeline

• 2026-04-08 - CVE-2025-50650 published to NVD
• 2026-04-08 - Last updated in NVD database

Technical Details for CVE-2025-50650

Vulnerability Analysis

This buffer overflow vulnerability stems from insufficient bounds checking when processing user-supplied input through the router's web administration interface. The routes_static parameter in the /router.asp endpoint does not properly validate the size of incoming data before copying it to a fixed-size buffer in memory. When an attacker submits data exceeding the expected buffer capacity, the excess data overwrites adjacent memory regions.

Buffer overflow vulnerabilities in embedded devices like routers are particularly concerning because these devices often run with elevated privileges and lack modern memory protection mechanisms such as ASLR (Address Space Layout Randomization) or stack canaries. Successful exploitation could allow an attacker to disrupt device operation or potentially gain control of the router.

Root Cause

The root cause of this vulnerability is inadequate input validation in the firmware's handling of the routes_static parameter. The web interface fails to enforce proper length constraints on user input before processing it, allowing attackers to provide maliciously crafted oversized data that exceeds the allocated buffer size.

Attack Vector

The vulnerability is exposed through the device's web administration interface at the /router.asp endpoint. An attacker with network access to the router's management interface can craft HTTP requests containing oversized values in the routes_static parameter. This attack requires the attacker to have access to the router's web interface, which may be exposed on the local network or, in misconfigured environments, accessible from the internet.

The attack involves sending specially crafted POST or GET requests to the vulnerable endpoint with an abnormally long routes_static parameter value. The exact exploitation mechanics would depend on the specific memory layout and architecture of the D-Link DI-8003 device.

Detection Methods for CVE-2025-50650

Indicators of Compromise

• Unexpected router reboots or crashes coinciding with web interface access
• Anomalous HTTP requests to /router.asp containing unusually long parameter values
• Unusual network traffic patterns from the router device
• Modified router configurations or unauthorized administrative access

Detection Strategies

• Monitor network traffic for HTTP requests to /router.asp with abnormally large parameter sizes
• Implement intrusion detection rules to identify buffer overflow attack patterns targeting D-Link devices
• Review router access logs for repeated failed requests or unusual access patterns
• Deploy network segmentation to isolate management interfaces from untrusted networks

Monitoring Recommendations

• Enable logging on the D-Link router if supported and forward logs to a centralized SIEM
• Monitor for unusual outbound connections from the router that may indicate compromise
• Regularly audit network traffic patterns to and from network infrastructure devices
• Implement network-based anomaly detection for IoT and embedded device communications

How to Mitigate CVE-2025-50650

Immediate Actions Required

• Restrict access to the router's web administration interface to trusted networks only
• Disable remote management features if not required
• Implement firewall rules to block unauthorized access to the router's management ports
• Monitor the D-Link Security Bulletin for firmware updates addressing this vulnerability

Patch Information

At the time of publication, no specific patch information is available. Administrators should monitor D-Link's official security resources for firmware updates that address this buffer overflow vulnerability. Check the D-Link Security Bulletin regularly for security advisories and updated firmware releases. Additional technical details may be available at the GitHub IoT Vulnerability Collection.

Workarounds

• Configure access control lists (ACLs) to limit web interface access to specific management hosts
• Place the router's management interface on a dedicated management VLAN
• Use a VPN to access the router's administration interface instead of direct exposure
• Consider replacing end-of-life devices that may not receive security updates