EUVD-2025-4508

Comprehensive Technical Analysis of EUVD-2025-4508

1. Vulnerability Assessment and Severity Evaluation

The vulnerability EUVD-2025-4508 affects the Tenda AC8V4 router, specifically in the firmware version V16.03.34.06. The issue resides in the function SUB_0046AC38 of the file /goform/WifiExtraSet, where the manipulation of the argument wpapsk_crypto leads to a stack-based buffer overflow.

Severity Evaluation:

• Base Score: 9.8 (Critical)
• Base Score Version: 3.1
• Base Score Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

The CVSS score of 9.8 indicates a critical vulnerability. The attack vector (AV:N) is network-based, requiring low complexity (AC:L) and no privileges (PR:N) or user interaction (UI:N). The impact on confidentiality, integrity, and availability is high (C:H/I:H/A:H), and the scope is unchanged (S:U).

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Remote Exploitation: Given the network-based attack vector, an attacker can exploit this vulnerability over the network without needing physical access to the device.
• Manipulation of wpapsk_crypto Argument: The vulnerability can be triggered by sending specially crafted input to the wpapsk_crypto argument, leading to a stack-based buffer overflow.

Exploitation Methods:

• Buffer Overflow: An attacker can craft a payload that overflows the buffer allocated for wpapsk_crypto, potentially leading to arbitrary code execution.
• Denial of Service (DoS): The buffer overflow can also cause the device to crash, resulting in a DoS condition.

3. Affected Systems and Software Versions

Affected Systems:

• Tenda AC8V4 routers

Software Versions:

• Firmware version V16.03.34.06

4. Recommended Mitigation Strategies

Immediate Actions:

• Firmware Update: Users should immediately update their Tenda AC8V4 routers to the latest firmware version provided by the manufacturer.
• Network Segmentation: Isolate the affected devices from critical networks to limit potential damage.
• Firewall Rules: Implement strict firewall rules to restrict access to the router's management interface.

Long-Term Strategies:

• Regular Patch Management: Establish a routine for regularly checking and applying firmware updates.
• Intrusion Detection Systems (IDS): Deploy IDS to monitor for suspicious activities targeting the router.
• Security Audits: Conduct regular security audits to identify and mitigate potential vulnerabilities.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to European organizations and individuals using the Tenda AC8V4 router. Given the critical nature of the vulnerability, successful exploitation could lead to unauthorized access, data breaches, and service disruptions. This underscores the importance of timely patch management and robust cybersecurity practices within the European Union.

6. Technical Details for Security Professionals

Vulnerability Details:

• Function Affected: SUB_0046AC38
• File Affected: /goform/WifiExtraSet
• Argument Manipulated: wpapsk_crypto

Exploitation Steps:

1. Identify Target: Locate the Tenda AC8V4 router on the network.
2. Craft Payload: Develop a payload that manipulates the wpapsk_crypto argument to trigger the buffer overflow.
3. Deliver Payload: Send the crafted payload to the router's management interface.
4. Exploit: Achieve arbitrary code execution or cause a DoS condition.

References:

• NVD Entry
• GitHub Analysis

Additional Notes:

• Assigner: Mitre
• EPSS: N/A
• ENISA ID Product: n/a
• ENISA ID Vendor: n/a

Conclusion

The vulnerability EUVD-2025-4508 in the Tenda AC8V4 router is critical and requires immediate attention. Organizations and individuals should prioritize updating their firmware and implementing robust security measures to mitigate the risk. The European cybersecurity landscape must remain vigilant against such vulnerabilities to protect against potential cyber threats.