EUVD-2025-20370

Comprehensive Technical Analysis of EUVD-2025-20370

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2025-20370 pertains to a potential out-of-bounds write in the wlan AP driver due to an incorrect bounds check. This flaw can lead to local escalation of privilege, allowing an attacker to gain higher privileges on the affected system. The CVSS (Common Vulnerability Scoring System) base score of 9.8 indicates a critical severity level. The CVSS vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H breaks down as follows:

• AV:N (Attack Vector: Network) - The vulnerability is exploitable over the network.
• AC:L (Attack Complexity: Low) - The attack requires low complexity to exploit.
• PR:N (Privileges Required: None) - No privileges are required to exploit the vulnerability.
• UI:N (User Interaction: None) - No user interaction is needed for exploitation.
• S:U (Scope: Unchanged) - The scope of the vulnerability does not change.
• C:H (Confidentiality: High) - The vulnerability has a high impact on confidentiality.
• I:H (Integrity: High) - The vulnerability has a high impact on integrity.
• A:H (Availability: High) - The vulnerability has a high impact on availability.

2. Potential Attack Vectors and Exploitation Methods

Given the nature of the vulnerability, potential attack vectors include:

• Network-Based Attacks: Since the attack vector is network-based, an attacker could exploit the vulnerability remotely without needing physical access to the device.
• Local Privilege Escalation: Once an attacker gains initial access to the system, they can exploit this vulnerability to escalate their privileges, potentially gaining full control over the device.
• Automated Exploitation: The low complexity and lack of user interaction required for exploitation make this vulnerability a prime candidate for automated attacks, such as those conducted by malware or botnets.

3. Affected Systems and Software Versions

The vulnerability affects several MediaTek products, including:

• MT6890, MT7615, MT7622, MT7663, MT7915, MT7916, MT7981, MT7986
• Software Versions: SDK release 7.6.7.2 and before / openWRT 19.07, 21.02

These products are commonly used in various networking devices, including routers and access points, which are critical components in both home and enterprise networks.

4. Recommended Mitigation Strategies

To mitigate the risk associated with this vulnerability, the following strategies are recommended:

• Apply Patches: Immediately apply the patch provided by MediaTek (Patch ID: WCNCR00416937).
• Network Segmentation: Implement network segmentation to isolate critical systems and reduce the attack surface.
• Access Controls: Enforce strict access controls and monitor for unauthorized access attempts.
• Regular Updates: Ensure that all devices are regularly updated with the latest security patches and firmware.
• Intrusion Detection Systems (IDS): Deploy IDS to detect and respond to suspicious network activities.

5. Impact on European Cybersecurity Landscape

The impact of this vulnerability on the European cybersecurity landscape is significant due to the widespread use of MediaTek products in networking devices. The potential for remote exploitation and privilege escalation poses a substantial risk to both individual users and organizations. The high CVSS score underscores the urgency for immediate action to mitigate the risk.

6. Technical Details for Security Professionals

• Vulnerability Type: Out-of-bounds write due to incorrect bounds check.
• Exploitation: The vulnerability can be exploited to achieve local privilege escalation, potentially leading to full system compromise.
• Detection: Security professionals should monitor for unusual network traffic patterns and unauthorized privilege escalation attempts.
• Response: In case of detection, isolate the affected device immediately and apply the necessary patches. Conduct a thorough investigation to determine the extent of the compromise and take appropriate remediation steps.

Conclusion

EUVD-2025-20370 represents a critical vulnerability in MediaTek's wlan AP driver that requires immediate attention. The potential for remote exploitation and privilege escalation makes it a high-priority issue for cybersecurity professionals. Implementing the recommended mitigation strategies and ensuring timely patching are essential to protect against potential attacks.

For further details, refer to the official MediaTek product security bulletin: https://corp.mediatek.com/product-security-bulletin/July-2025