EUVD-2025-6519

Comprehensive Technical Analysis of EUVD-2025-6519

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2025-6519 pertains to a stack overflow in the cloneType parameter of the /goform/AdvSetMacMtuWan endpoint in Tenda AC9 v1.0 V15.03.05.14_multi. This vulnerability can be exploited to achieve remote arbitrary code execution. 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
• AC:L - Attack Complexity: Low
• PR:N - Privileges Required: None
• UI:N - User Interaction: None
• S:U - Scope: Unchanged
• C:H - Confidentiality: High
• I:H - Integrity: High
• A:H - Availability: High

This high score underscores the critical nature of the vulnerability, indicating that it can be easily exploited with severe consequences.

2. Potential Attack Vectors and Exploitation Methods

The primary attack vector is through network access (AV:N), meaning an attacker can exploit this vulnerability remotely. The low attack complexity (AC:L) and the lack of required privileges (PR:N) or user interaction (UI:N) make this vulnerability particularly dangerous.

Exploitation Methods:

• Crafted HTTP Requests: An attacker can send specially crafted HTTP requests to the vulnerable endpoint /goform/AdvSetMacMtuWan with a malicious cloneType parameter.
• Buffer Overflow: By sending an overly long or malformed cloneType parameter, the attacker can cause a stack overflow, leading to arbitrary code execution.
• Remote Code Execution: Once the stack overflow is triggered, the attacker can inject and execute arbitrary code on the affected device.

3. Affected Systems and Software Versions

The vulnerability specifically affects:

• Tenda AC9 v1.0 V15.03.05.14_multi

Other versions of Tenda AC9 or similar devices may also be affected if they share the same codebase or have not been patched for this vulnerability.

4. Recommended Mitigation Strategies

Immediate Actions:

• Patch Management: Ensure that all affected devices are updated to the latest firmware version that addresses this vulnerability.
• Network Segmentation: Isolate affected devices from critical networks to limit potential damage.
• Firewall Rules: Implement strict firewall rules to restrict access to the vulnerable endpoint.
• Intrusion Detection Systems (IDS): Deploy IDS to monitor for suspicious activity targeting the /goform/AdvSetMacMtuWan endpoint.

Long-Term Strategies:

• Regular Security Audits: Conduct regular security audits and vulnerability assessments on all network devices.
• Vendor Communication: Stay in communication with the vendor for updates and patches.
• User Education: Educate users on the importance of keeping firmware up to date and recognizing potential security threats.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to European cybersecurity, particularly in environments where Tenda AC9 devices are widely deployed. The potential for remote arbitrary code execution can lead to:

• Data Breaches: Compromise of sensitive data.
• Network Compromise: Unauthorized access to internal networks.
• Service Disruption: Denial of service attacks affecting availability.

Given the critical nature of the vulnerability, it is essential for organizations to prioritize mitigation efforts to protect against potential exploitation.

6. Technical Details for Security Professionals

Vulnerability Details:

• Endpoint: /goform/AdvSetMacMtuWan
• Parameter: cloneType
• Vulnerability Type: Stack Overflow
• Exploitation: Remote arbitrary code execution through crafted HTTP requests.

Detection and Response:

• Log Analysis: Monitor logs for unusual activity targeting the /goform/AdvSetMacMtuWan endpoint.
• Behavioral Analysis: Use behavioral analysis tools to detect anomalous behavior indicative of a stack overflow exploit.
• Incident Response: Have an incident response plan in place to quickly address any detected exploitation attempts.

References:

• NVD Entry: CVE-2025-29385
• GitHub Analysis: Tenda AC9 Vulnerability Analysis

By addressing this vulnerability promptly and effectively, organizations can significantly reduce the risk of exploitation and maintain the integrity and security of their networks.