EUVD-2025-11767

Comprehensive Technical Analysis of EUVD-2025-11767

1. Vulnerability Assessment and Severity Evaluation

The vulnerability identified in the EUVD entry EUVD-2025-11767 pertains to a critical issue in the D-Link DIR-832x router, specifically in the firmware version 240802. The vulnerability allows a remote attacker to execute arbitrary code via the macaddr key value to the function 0x42232c.

Severity Evaluation:

• Base Score: 9.8 (Critical)
• Base Score Version: CVSS 3.1
• Base Score Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

The CVSS score of 9.8 indicates a critical vulnerability due to the following factors:

• Attack Vector (AV): Network (N)
• Attack Complexity (AC): Low (L)
• Privileges Required (PR): None (N)
• User Interaction (UI): None (N)
• Scope (S): Unchanged (U)
• Confidentiality (C): High (H)
• Integrity (I): High (H)
• Availability (A): High (H)

This high score underscores the severity of the vulnerability, which can be exploited remotely with low complexity and without requiring any user interaction or special privileges.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Remote Code Execution (RCE): The primary attack vector is remote code execution, where an attacker can send specially crafted packets to the router, exploiting the macaddr key value to execute arbitrary code.
• Command Injection: The vulnerability can also be exploited through command injection, allowing the attacker to inject malicious commands into the router's firmware.

Exploitation Methods:

• Network Scanning: Attackers can scan for vulnerable D-Link DIR-832x routers on the internet.
• Crafted Packets: Once a vulnerable router is identified, attackers can send crafted packets to the router, targeting the macaddr key value to execute arbitrary code.
• Automated Scripts: Attackers may use automated scripts to exploit the vulnerability en masse, targeting multiple routers simultaneously.

3. Affected Systems and Software Versions

Affected Systems:

• D-Link DIR-832x routers

Affected Software Versions:

• Firmware version 240802

It is crucial to note that other versions of the firmware may also be affected, but this specific entry pertains to version 240802.

4. Recommended Mitigation Strategies

Immediate Actions:

• Firmware Update: Immediately update the router firmware to the latest version provided by D-Link.
• Network Segmentation: Isolate the router from critical network segments to limit the potential impact of an exploit.
• Firewall Rules: Implement strict firewall rules to block unsolicited incoming traffic to the router.
• Monitoring: Increase monitoring of network traffic to detect any suspicious activity targeting the router.

Long-Term Actions:

• Regular Patching: Establish a regular patching schedule to ensure all network devices are up to date.
• Security Audits: Conduct regular security audits to identify and mitigate potential vulnerabilities.
• User Education: Educate users on the importance of updating firmware and the risks associated with outdated devices.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to the European cybersecurity landscape, particularly for organizations and individuals using D-Link DIR-832x routers. The potential for remote code execution and command injection can lead to:

• Data Breaches: Unauthorized access to sensitive data.
• Network Compromise: Compromise of entire networks, leading to further attacks.
• Service Disruption: Disruption of critical services, affecting business operations and personal users.

Given the widespread use of D-Link routers, the impact could be extensive, affecting both small businesses and large enterprises.

6. Technical Details for Security Professionals

Vulnerability Details:

• Function: 0x42232c
• Key Value: macaddr
• Exploit Method: The vulnerability is triggered by sending a specially crafted packet to the router, which includes the macaddr key value. This key value is not properly sanitized, allowing for command injection and arbitrary code execution.

References:

• D-Link Security Bulletin: D-Link Security Bulletin
• GitHub Repository: Dlink-dir-823x-set_prohibiting-macaddr-CommandInjection
• Gist: Gist
• NVD Entry: CVE-2025-29042

Additional Notes:

• EPSS: Not Available (N/A)
• ENISA ID Product: Not Available (N/A)
• ENISA ID Vendor: Not Available (N/A)

Conclusion: The vulnerability EUVD-2025-11767 is a critical issue that requires immediate attention. Organizations and individuals using D-Link DIR-832x routers should prioritize updating their firmware and implementing robust security measures to mitigate the risk of exploitation. The European cybersecurity community should be vigilant and proactive in addressing this vulnerability to prevent potential large-scale attacks.