EUVD-2025-4109

Comprehensive Technical Analysis of EUVD-2025-4109

1. Vulnerability Assessment and Severity Evaluation

The EUVD entry EUVD-2025-4109 describes a buffer overflow vulnerability in the formexeCommand function of the Tenda AC6 V15.03.05.16 firmware. The vulnerability has a CVSS Base Score of 9.8, which is classified as critical. The CVSS vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H indicates the following:

• Attack Vector (AV:N): The vulnerability can be exploited remotely over the network.
• Attack Complexity (AC:L): The attack requires low complexity to exploit.
• Privileges Required (PR:N): No privileges are required to exploit the vulnerability.
• User Interaction (UI:N): No user interaction is required.
• Scope (S:U): The vulnerability does not change the security scope.
• Confidentiality (C:H): The vulnerability has a high impact on confidentiality.
• Integrity (I:H): The vulnerability has a high impact on integrity.
• Availability (A:H): The vulnerability has a high impact on availability.

Given these metrics, the vulnerability is highly severe and poses a significant risk to affected systems.

2. Potential Attack Vectors and Exploitation Methods

The buffer overflow vulnerability in the formexeCommand function can be exploited through several attack vectors:

• Remote Code Execution (RCE): An attacker could send specially crafted network packets to the vulnerable function, leading to arbitrary code execution on the device.
• Denial of Service (DoS): By exploiting the buffer overflow, an attacker could crash the device, rendering it unavailable.
• Data Exfiltration: The attacker could potentially extract sensitive information from the device's memory.

Exploitation methods may include:

• Network Scanning: Identifying vulnerable devices on the network.
• Crafted Payloads: Sending malicious payloads to the formexeCommand function to trigger the buffer overflow.
• Automated Scripts: Using automated scripts to exploit the vulnerability across multiple devices.

3. Affected Systems and Software Versions

The vulnerability specifically affects the Tenda AC6 router with firmware version V15.03.05.16. Other versions of the Tenda AC6 firmware may also be affected, but this has not been confirmed. It is crucial to verify the firmware version of all Tenda AC6 routers in use.

4. Recommended Mitigation Strategies

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

• Firmware Update: Immediately update the firmware to a patched version once available.
• Network Segmentation: Isolate vulnerable devices from critical networks to limit potential damage.
• Firewall Rules: Implement strict firewall rules to restrict access to the vulnerable function.
• Intrusion Detection Systems (IDS): Deploy IDS to monitor for suspicious activity targeting the formexeCommand function.
• Regular Audits: Conduct regular security audits to identify and address vulnerabilities promptly.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant threat to the European cybersecurity landscape, particularly for organizations and individuals using Tenda AC6 routers. The potential for remote code execution and data exfiltration could lead to widespread security breaches, including unauthorized access to sensitive information, disruption of services, and potential financial losses.

6. Technical Details for Security Professionals

For security professionals, the following technical details are pertinent:

• Vulnerability Identification: The vulnerability is identified by EUVD-2025-4109 and CVE-2025-25343.
• References: Additional information can be found at:
  • GitHub Issue
  • NVD Detail
• Exploit Development: Security professionals should be aware of the potential for exploit development and the need for proactive measures to protect against such threats.
• Monitoring and Logging: Enhance monitoring and logging for the formexeCommand function to detect and respond to any suspicious activity.

In conclusion, the buffer overflow vulnerability in the Tenda AC6 V15.03.05.16 firmware is a critical issue that requires immediate attention. Organizations should prioritize updating their firmware and implementing robust security measures to mitigate the risk. The European cybersecurity community should remain vigilant and collaborate to address this and similar vulnerabilities effectively.