EUVD-2025-16950

Comprehensive Technical Analysis of EUVD-2025-16950

1. Vulnerability Assessment and Severity Evaluation

The vulnerability EUVD-2025-16950 affects the D-Link DIR-816 router, specifically version 1.10CNB05. This vulnerability is classified as critical with a CVSS base score of 9.3. The high severity is due to the potential for remote exploitation leading to a stack-based buffer overflow, which can result in high confidentiality, integrity, and availability impacts. The vulnerability is located in the QoSPortSetup function within the file /goform/QoSPortSetup, and it involves the manipulation of specific arguments (port0_group, port0_remarker, ssid0_group, ssid0_remarker).

2. Potential Attack Vectors and Exploitation Methods

• Remote Exploitation: The vulnerability can be exploited remotely without requiring any user interaction or privileges. An attacker can send specially crafted requests to the affected function, leading to a buffer overflow.
• Buffer Overflow: The manipulation of the specified arguments can cause a stack-based buffer overflow, which can be leveraged to execute arbitrary code or crash the device.
• Public Exploit Availability: The exploit has been disclosed to the public, increasing the risk of widespread attacks.

3. Affected Systems and Software Versions

• Product: D-Link DIR-816
• Version: 1.10CNB05
• Note: This vulnerability only affects products that are no longer supported by the maintainer, which means that no patches or updates will be provided by D-Link.

4. Recommended Mitigation Strategies

• Network Segmentation: Isolate the affected devices from critical networks to limit the potential impact of an attack.
• Firewall Rules: Implement strict firewall rules to restrict access to the vulnerable function.
• Firmware Upgrade: Although the affected version is no longer supported, consider upgrading to a newer, supported model if possible.
• Monitoring and Detection: Implement monitoring solutions to detect unusual traffic patterns or attempts to exploit the vulnerability.
• Intrusion Detection Systems (IDS): Deploy IDS to identify and alert on suspicious activities targeting the vulnerable function.

5. Impact on European Cybersecurity Landscape

The presence of this vulnerability in a widely used consumer device poses a significant risk to the European cybersecurity landscape. Unpatched devices can be exploited to launch further attacks, including botnet recruitment, data exfiltration, and lateral movement within networks. The lack of support from the vendor exacerbates the risk, as users are left without official patches. This underscores the importance of timely updates and the need for regulatory frameworks to ensure ongoing support for critical devices.

6. Technical Details for Security Professionals

• Vulnerable Function: QoSPortSetup
• Affected File: /goform/QoSPortSetup
• Vulnerable Arguments: port0_group, port0_remarker, ssid0_group, ssid0_remarker
• Exploit Type: Stack-based buffer overflow
• CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
• References:
  • VulDB Entry
  • CTIID Entry
  • Submission Details
  • GitHub Repository
  • D-Link Official Website
  • NVD Entry

Conclusion

The vulnerability EUVD-2025-16950 in the D-Link DIR-816 router is a critical issue that requires immediate attention. Due to the lack of vendor support, users must implement alternative mitigation strategies to protect their networks. The European cybersecurity community should prioritize awareness and proactive measures to mitigate the risks associated with this vulnerability.