EUVD-2025-197671

Comprehensive Technical Analysis of EUVD-2025-197671

1. Vulnerability Assessment and Severity Evaluation

The vulnerability identified in EUVD-2025-197671 affects the D-Link DIR-816L router, specifically in the firmware version 2_06_b09_beta. The issue resides in the authenticationcgi_main function of the /authentication.cgi file, where manipulation of the Password argument leads to a stack-based buffer overflow. This vulnerability is severe, with a CVSS base score of 9.3, indicating a critical risk.

Severity Evaluation:

• CVSS Base Score: 9.3
• 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/E:P
• Impact Metrics:
  • Confidentiality Impact (VC): High
  • Integrity Impact (VI): High
  • Availability Impact (VA): High
• Exploitability Metrics:
  • Attack Vector (AV): Network
  • Attack Complexity (AC): Low
  • Privileges Required (PR): None
  • User Interaction (UI): None
  • Scope (SC): Unchanged

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Remote Exploitation: The vulnerability can be exploited remotely over the network, making it highly accessible to attackers.
• Authentication Bypass: By manipulating the Password argument, attackers can bypass authentication mechanisms, potentially gaining unauthorized access to the router's administrative interface.

Exploitation Methods:

• Buffer Overflow: Crafting a specially designed input to overflow the stack buffer in the authenticationcgi_main function.
• Code Execution: Potential execution of arbitrary code, leading to full control over the device.
• Denial of Service (DoS): Crashing the device by exploiting the buffer overflow, leading to service disruption.

3. Affected Systems and Software Versions

Affected Systems:

• Device: D-Link DIR-816L
• Firmware Version: 2_06_b09_beta

Note: This vulnerability only affects products that are no longer supported by the maintainer, increasing the risk for users who have not upgraded to newer, supported firmware versions.

4. Recommended Mitigation Strategies

Immediate Actions:

• Firmware Upgrade: Users should upgrade to the latest supported firmware version if available.
• Network Segmentation: Isolate the affected device from critical networks to limit potential damage.
• Firewall Rules: Implement strict firewall rules to restrict access to the device's administrative interface.

Long-Term Strategies:

• Regular Updates: Ensure all network devices are regularly updated with the latest firmware and security patches.
• Monitoring: Implement continuous monitoring and logging to detect any suspicious activities.
• Intrusion Detection Systems (IDS): Deploy IDS to identify and respond to potential exploitation attempts.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to European users and organizations relying on the D-Link DIR-816L router. Given the widespread use of such devices in both residential and small business environments, the potential for large-scale exploitation is high. This could lead to data breaches, unauthorized access, and service disruptions, impacting the overall cybersecurity posture of the region.

6. Technical Details for Security Professionals

Vulnerability Details:

• Function Affected: authenticationcgi_main
• File Affected: /authentication.cgi
• Vulnerable Argument: Password
• Type of Vulnerability: Stack-based buffer overflow

Exploit Availability:

• The exploit is public and may be used by attackers.

References:

• VulDB Entry
• CTIID Entry
• Submission Details
• Technical Analysis PDF
• D-Link Official Website
• NVD Entry

Aliases:

• CVE ID: CVE-2025-13188

Assigner:

• VulDB

ENISA IDs:

• Product: 89c3460d-bf61-364c-8a86-1890b819601a
• Vendor: d5544538-76fd-3fde-b293-17eefb8bd666

By addressing this vulnerability promptly and implementing robust mitigation strategies, organizations can significantly reduce the risk of exploitation and maintain a secure network environment.