EUVD-2025-4506

Comprehensive Technical Analysis of EUVD-2025-4506

1. Vulnerability Assessment and Severity Evaluation

The vulnerability EUVD-2025-4506 pertains to a stack overflow in the Tenda AC8V4 V16.03.34.06 firmware, specifically within the get_parentControl_list_Info function when handling the urls parameter. The Common Vulnerability Scoring System (CVSS) 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:

• Attack Vector (AV:N): Network, meaning the vulnerability is exploitable remotely.
• Attack Complexity (AC:L): Low, indicating that the attack does not require specialized conditions.
• Privileges Required (PR:N): None, meaning no privileges are needed to exploit the vulnerability.
• User Interaction (UI:N): None, indicating that no user interaction is required.
• Scope (S:U): Unchanged, meaning the vulnerability does not affect resources beyond the security scope managed by the security authority.
• Confidentiality (C:H): High impact on confidentiality.
• Integrity (I:H): High impact on integrity.
• Availability (A:H): High impact on availability.

This high base score underscores the critical nature of the vulnerability, which can lead to severe consequences if exploited.

2. Potential Attack Vectors and Exploitation Methods

The stack overflow vulnerability can be exploited through the following methods:

• Remote Code Execution (RCE): An attacker can send a specially crafted request to the get_parentControl_list_Info function, causing a stack overflow. This can lead to arbitrary code execution on the affected device.
• Denial of Service (DoS): The stack overflow can cause the device to crash or become unresponsive, leading to a denial of service.
• Data Exfiltration: If the attacker gains control over the device, they can exfiltrate sensitive data, including network configurations and user credentials.

3. Affected Systems and Software Versions

The vulnerability specifically affects:

• Tenda AC8V4 V16.03.34.06: This version of the firmware is confirmed to be vulnerable. Other versions of the Tenda AC8V4 firmware may also be affected but have not been explicitly mentioned in the EUVD entry.

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. Regularly check for updates from the vendor.
• Network Segmentation: Isolate the affected devices on a separate network segment to limit the potential impact of an exploit.
• Firewall Rules: Implement strict firewall rules to restrict access to the device, allowing only trusted IP addresses.
• Intrusion Detection Systems (IDS): Deploy IDS to monitor for unusual network activity that may indicate an attempted exploit.
• Regular Audits: Conduct regular security audits and vulnerability assessments to identify and address potential security issues.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to the European cybersecurity landscape, particularly for organizations and individuals using Tenda AC8V4 routers. The potential for remote code execution and data exfiltration can lead to severe breaches, including:

• Data Breaches: Sensitive information can be compromised, leading to financial and reputational damage.
• Service Disruptions: Critical services relying on the affected routers may experience downtime, impacting business operations.
• Compliance Issues: Organizations may face regulatory penalties for non-compliance with data protection laws such as GDPR.

6. Technical Details for Security Professionals

For security professionals, the following technical details are pertinent:

• Vulnerable Function: The get_parentControl_list_Info function is vulnerable to a stack overflow when processing the urls parameter.
• Exploit Development: Crafting a payload that exceeds the buffer size allocated for the urls parameter can trigger the stack overflow. This can be achieved through tools like Metasploit or custom scripts.
• Detection: Monitor network traffic for unusual patterns, such as repeated requests to the get_parentControl_list_Info function with large payloads.
• Response: In case of an incident, isolate the affected device, capture forensic data, and apply the latest firmware updates.

Conclusion

The vulnerability EUVD-2025-4506 in the Tenda AC8V4 V16.03.34.06 firmware is critical and requires immediate attention. Organizations should prioritize updating their firmware and implementing robust security measures to mitigate the risk. Continuous monitoring and regular security assessments are essential to maintain a strong cybersecurity posture in the face of such threats.