CVE-2025-50655 Overview
A buffer overflow vulnerability has been identified in D-Link DI-8003 router firmware version 16.07.26A1. The vulnerability exists due to improper handling of the name parameter in the /thd_group.asp endpoint. This flaw in the web management interface could allow attackers to overflow a buffer, potentially leading to denial of service or arbitrary code execution on the affected device.
Critical Impact
Buffer overflow in D-Link DI-8003 router's web interface could allow attackers to crash the device or execute arbitrary code through malicious input to the name parameter.
Affected Products
- D-Link DI-8003 firmware version 16.07.26A1
Discovery Timeline
- 2026-04-08 - CVE-2025-50655 published to NVD
- 2026-04-08 - Last updated in NVD database
Technical Details for CVE-2025-50655
Vulnerability Analysis
This vulnerability is classified as a buffer overflow, a memory corruption flaw that occurs when a program writes data beyond the boundaries of allocated memory. In the case of CVE-2025-50655, the D-Link DI-8003 router's web management interface fails to properly validate and sanitize the name parameter when processing requests to the /thd_group.asp endpoint.
When an attacker supplies an oversized or specially crafted value for the name parameter, the application attempts to store this data in a fixed-size buffer without adequate bounds checking. This overflow can corrupt adjacent memory regions, potentially overwriting critical data structures, return addresses, or function pointers.
Root Cause
The root cause of this vulnerability lies in insufficient input validation within the firmware's web server component. The /thd_group.asp endpoint processes user-supplied data from the name parameter without implementing proper length checks or boundary validation. This is a common issue in embedded device firmware where resource constraints often lead to the use of unsafe string handling functions that do not perform bounds checking.
Attack Vector
An attacker with network access to the D-Link DI-8003's web management interface can exploit this vulnerability by sending a crafted HTTP request to the /thd_group.asp endpoint with an oversized name parameter value. The attack does not require authentication if the management interface is accessible.
The exploitation typically involves:
- Identifying a vulnerable D-Link DI-8003 device with firmware version 16.07.26A1
- Crafting an HTTP request targeting the /thd_group.asp endpoint
- Including a maliciously crafted name parameter designed to overflow the buffer
- Depending on the specific memory layout, achieving denial of service or potentially remote code execution
For technical details about this vulnerability, refer to the GitHub IoT Vulnerability Collection.
Detection Methods for CVE-2025-50655
Indicators of Compromise
- Unexpected device reboots or crashes of the D-Link DI-8003 router
- Unusual HTTP requests with abnormally long name parameters targeting /thd_group.asp
- Network traffic anomalies indicating exploitation attempts against the web management interface
- Unexpected changes in router configuration or behavior
Detection Strategies
- Monitor web server logs for requests to /thd_group.asp containing oversized parameter values
- Implement network intrusion detection rules to identify buffer overflow exploitation patterns targeting D-Link devices
- Deploy web application firewall rules to block requests with excessively long input parameters to the management interface
- Conduct regular vulnerability scans of network infrastructure to identify devices running vulnerable firmware versions
Monitoring Recommendations
- Enable and regularly review access logs on the D-Link DI-8003 web management interface
- Implement network segmentation to isolate IoT and network infrastructure devices from untrusted networks
- Configure SIEM alerts for unusual traffic patterns to router management interfaces
- Monitor for unexpected outbound connections from network devices that could indicate compromise
How to Mitigate CVE-2025-50655
Immediate Actions Required
- Restrict access to the D-Link DI-8003 web management interface to trusted IP addresses only
- Disable remote management if not required for operations
- Ensure the management interface is not exposed to the internet
- Monitor the D-Link Security Bulletin for firmware updates addressing this vulnerability
Patch Information
At the time of publication, users should check the D-Link Security Bulletin for the latest firmware updates and security patches. Firmware version 16.07.26A1 has been identified as vulnerable, and users should upgrade to a patched version as soon as one becomes available from D-Link.
Workarounds
- Implement firewall rules to restrict access to the router's web management interface to specific trusted IP addresses
- Place the D-Link DI-8003 behind a perimeter firewall that blocks external access to the management port
- Use a VPN to access the management interface if remote administration is necessary
- Consider replacing end-of-life devices that may no longer receive security updates
# Example firewall rule to restrict management interface access (iptables)
# Replace 192.168.1.0/24 with your trusted management network
iptables -A INPUT -p tcp --dport 80 -s 192.168.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
