EUVD-2025-9958

Comprehensive Technical Analysis of EUVD-2025-9958

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2025-9958 pertains to an out-of-bounds write in the wlan service due to an incorrect bounds check. This flaw can lead to remote code execution (RCE) without requiring any additional execution privileges or user interaction. 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 is relatively straightforward to execute.
• PR:N (Privileges Required: None) - No special privileges are needed to exploit the vulnerability.
• UI:N (User Interaction: None) - No user interaction is required for the attack to succeed.
• S:U (Scope: Unchanged) - The vulnerability does not change the security scope.
• 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.

Given these metrics, the vulnerability poses a significant risk to affected systems.

2. Potential Attack Vectors and Exploitation Methods

The primary attack vector for this vulnerability is through network-based exploitation. An attacker could send specially crafted packets to the wlan service, triggering the out-of-bounds write. This could lead to arbitrary code execution on the affected device. The attack does not require any user interaction, making it particularly dangerous in environments where devices are exposed to untrusted networks.

Potential exploitation methods include:

• Network Scanning: Identifying vulnerable devices on the network.
• Crafted Packets: Sending malicious packets designed to exploit the bounds check flaw.
• Automated Scripts: Using automated scripts to scan and exploit vulnerable devices en masse.

3. Affected Systems and Software Versions

The vulnerability affects several MediaTek products and software versions:

• MT6890, MT7622, MT7915, MT7916, MT7981, MT7986
  • SDK version 7.4.0.1 and before (for MT7622 and MT7915)
  • SDK version 7.6.7.0 and before (for MT7916, MT7981, and MT7986)
  • OpenWrt 19.07, 21.02 (for MT6890)

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

4. Recommended Mitigation Strategies

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

• Patch Management: Apply the latest patches and updates provided by MediaTek. The Patch ID is WCNCR00406897.
• Network Segmentation: Isolate vulnerable devices from untrusted networks to limit exposure.
• Firewall Rules: Implement strict firewall rules to block unsolicited incoming traffic to the wlan service.
• Intrusion Detection Systems (IDS): Deploy IDS to monitor for suspicious network activity that may indicate an exploitation attempt.
• Regular Audits: Conduct regular security audits and vulnerability assessments to identify and address potential weaknesses.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant threat to the European cybersecurity landscape, particularly in sectors that rely heavily on networking devices, such as telecommunications, healthcare, and critical infrastructure. The potential for remote code execution without user interaction makes this vulnerability particularly concerning, as it could be exploited to disrupt services, exfiltrate data, or launch further attacks within compromised networks.

6. Technical Details for Security Professionals

For security professionals, the following technical details are pertinent:

• Vulnerability Type: Out-of-bounds write due to incorrect bounds check.
• Exploitation: Remote code execution via network-based attack.
• Affected Components: wlan service in MediaTek products.
• Detection: Monitor network traffic for anomalous patterns that may indicate an exploitation attempt. Use tools like Wireshark to analyze packet data.
• Response: Implement incident response plans that include isolating affected devices, applying patches, and conducting forensic analysis to determine the extent of the compromise.

Conclusion

EUVD-2025-9958 represents a critical vulnerability that requires immediate attention from cybersecurity professionals. The potential for remote code execution without user interaction underscores the need for proactive mitigation strategies, including patch management, network segmentation, and robust monitoring. Organizations should prioritize addressing this vulnerability to protect their networks and data from potential exploitation.

References

• NVD Entry
• MediaTek Security Bulletin