CVE-2025-50664 Overview
A buffer overflow vulnerability exists in D-Link DI-8003 firmware version 16.07.26A1 due to improper handling of parameters in the /user_group.asp endpoint. An attacker can exploit this vulnerability by sending a crafted HTTP GET request with the name, mem, pri, and attr parameters, potentially leading to memory corruption and system compromise.
Critical Impact
This buffer overflow vulnerability in D-Link DI-8003 routers allows attackers to send malicious HTTP requests that may corrupt memory and compromise device integrity, potentially affecting network security.
Affected Products
- D-Link DI-8003 firmware version 16.07.26A1
Discovery Timeline
- 2026-04-08 - CVE-2025-50664 published to NVD
- 2026-04-08 - Last updated in NVD database
Technical Details for CVE-2025-50664
Vulnerability Analysis
This firmware vulnerability affects D-Link DI-8003 routers running firmware version 16.07.26A1. The vulnerability stems from insufficient bounds checking when processing user-supplied input through the web management interface. When the /user_group.asp endpoint receives HTTP GET requests containing the name, mem, pri, and attr parameters, the firmware fails to properly validate the length of these inputs before copying them into fixed-size memory buffers.
The attack surface is the device's web management interface, making this vulnerability particularly concerning for devices exposed to untrusted networks. Successful exploitation could allow an attacker to overwrite adjacent memory regions, potentially leading to denial of service or arbitrary code execution on the affected device.
Root Cause
The root cause of this vulnerability is improper input validation and lack of boundary checks in the /user_group.asp endpoint handler. The firmware does not adequately verify that user-supplied parameter values fit within the allocated buffer space before processing them, resulting in a classic buffer overflow condition. This type of memory safety issue is common in embedded device firmware written in languages like C that do not provide automatic bounds checking.
Attack Vector
The vulnerability can be exploited remotely by sending specially crafted HTTP GET requests to the device's web management interface. An attacker would construct a malicious request targeting the /user_group.asp endpoint with oversized values in the name, mem, pri, or attr parameters. The attack does not require authentication if the web interface is accessible, though exploitation may be limited to the local network unless the management interface is exposed to the internet.
The exploitation process involves:
- Identifying a vulnerable D-Link DI-8003 device with firmware version 16.07.26A1
- Crafting an HTTP GET request with malicious parameter values designed to overflow the target buffer
- Sending the request to the /user_group.asp endpoint
- The oversized input overwrites adjacent memory, potentially corrupting execution flow or causing a crash
For technical details on this vulnerability, refer to the GitHub IoT Vulnerability Collection.
Detection Methods for CVE-2025-50664
Indicators of Compromise
- Unexpected crashes or reboots of D-Link DI-8003 devices
- Unusual HTTP GET requests to /user_group.asp with abnormally long parameter values
- Network traffic anomalies from the router's management interface
- Device configuration changes not initiated by administrators
Detection Strategies
- Monitor HTTP access logs for requests to /user_group.asp containing unusually long name, mem, pri, or attr parameters
- Implement intrusion detection rules to flag oversized HTTP GET parameters targeting D-Link device management endpoints
- Deploy network monitoring to detect suspicious traffic patterns to IoT device management interfaces
Monitoring Recommendations
- Regularly audit network device firmware versions and flag devices running vulnerable versions
- Configure SIEM rules to alert on potential buffer overflow attack patterns against embedded devices
- Monitor device health metrics for unexpected restarts or memory exhaustion events
How to Mitigate CVE-2025-50664
Immediate Actions Required
- Restrict access to the D-Link DI-8003 web management interface to trusted networks only
- Implement firewall rules to block external access to the device management interface
- Check the D-Link Security Bulletin for firmware updates addressing this vulnerability
- Consider network segmentation to isolate vulnerable IoT devices from critical network resources
Patch Information
Organizations should monitor the D-Link Security Bulletin for official firmware updates that address this buffer overflow vulnerability. Until a patch is available, apply the recommended workarounds to reduce exposure.
Workarounds
- Disable remote management access to the D-Link DI-8003 web interface
- Place the device behind a firewall that restricts access to the management interface
- Use VPN for any required remote administration rather than exposing the management interface directly
- Consider replacing end-of-life devices that may not receive security updates
# Example firewall rule to restrict access to device management interface
# Block external access to the router's web management port (typically 80/443)
iptables -A INPUT -p tcp --dport 80 -s ! 192.168.1.0/24 -j DROP
iptables -A INPUT -p tcp --dport 443 -s ! 192.168.1.0/24 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
