EUVD-2025-203303

Comprehensive Technical Analysis of EUVD-2025-203303

1. Vulnerability Assessment and Severity Evaluation

The vulnerability EUVD-2025-203303 affects the Tenda WH450 router, specifically version 1.0.0.18. The flaw resides in the HTTP Request Handler component, particularly in the file /goform/DhcpListClient. The issue is a stack-based buffer overflow caused by the manipulation of the page argument. This vulnerability is severe, with a CVSS base score of 9.3, indicating a critical risk.

CVSS Vector Breakdown:

• AV:N (Network Vector): The vulnerability can be exploited remotely over the network.
• AC:L (Low Complexity): The attack requires low skill or resources to exploit.
• AT:N (No Authentication): No authentication is required to exploit the vulnerability.
• PR:N (No Privileges Required): No special privileges are needed to exploit the vulnerability.
• UI:N (No User Interaction): No user interaction is required to exploit the vulnerability.
• VC:H (High Confidentiality Impact): Successful exploitation can lead to significant confidentiality breaches.
• VI:H (High Integrity Impact): Successful exploitation can lead to significant integrity breaches.
• VA:H (High Availability Impact): Successful exploitation can lead to significant availability breaches.
• SC:N (No Scope Change): The vulnerability does not change the security scope.
• SI:N (No Scope Change): The vulnerability does not change the security scope.
• SA:N (No Scope Change): The vulnerability does not change the security scope.
• E:P (Proof of Concept Exists): A proof-of-concept exploit is publicly available.

2. Potential Attack Vectors and Exploitation Methods

The primary attack vector is remote exploitation via crafted HTTP requests targeting the /goform/DhcpListClient endpoint. An attacker can send a specially crafted request with a manipulated page argument to trigger a stack-based buffer overflow. This can lead to arbitrary code execution, denial of service, or unauthorized access to sensitive information.

Exploitation Methods:

• Buffer Overflow: By sending a large amount of data in the page argument, an attacker can overwrite the stack and execute arbitrary code.
• Remote Code Execution (RCE): If the buffer overflow is successfully exploited, an attacker can execute malicious code on the affected device.
• Denial of Service (DoS): The buffer overflow can cause the device to crash, leading to a denial of service.

3. Affected Systems and Software Versions

The vulnerability specifically affects:

• Product: Tenda WH450
• Version: 1.0.0.18

Other versions of the Tenda WH450 and similar devices from Tenda may also be affected, but this has not been confirmed.

4. Recommended Mitigation Strategies

Immediate Actions:

• Patch Management: Apply the latest firmware updates provided by Tenda as soon as they are available.
• Network Segmentation: Isolate the affected devices from critical networks to limit potential damage.
• Firewall Rules: Implement strict firewall rules to block unauthorized access to the HTTP Request Handler.
• Intrusion Detection Systems (IDS): Deploy IDS to monitor for suspicious activity targeting the /goform/DhcpListClient endpoint.

Long-Term Strategies:

• Regular Audits: Conduct regular security audits and vulnerability assessments of network devices.
• User Education: Educate users on the importance of keeping firmware up-to-date and recognizing phishing attempts.
• Vendor Communication: Maintain open communication with Tenda for updates and patches.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to European organizations and individuals using the Tenda WH450 router. Given the widespread use of such devices in homes and small businesses, the potential for large-scale exploitation is high. This underscores the need for robust cybersecurity measures and continuous monitoring of network devices.

6. Technical Details for Security Professionals

Vulnerability Details:

• File: /goform/DhcpListClient
• Component: HTTP Request Handler
• Argument: page
• Type: Stack-based buffer overflow

Exploit Availability:

• Public Exploit: A proof-of-concept (PoC) exploit is available on GitHub.
• References:
  • NVD Entry
  • GitHub PoC
  • VulDB Entry

Mitigation Steps:

• Firmware Update: Ensure all Tenda WH450 devices are updated to the latest firmware version.
• Access Control: Restrict access to the HTTP Request Handler to trusted IP addresses only.
• Monitoring: Implement continuous monitoring for unusual traffic patterns and anomalies.

Conclusion: The vulnerability EUVD-2025-203303 represents a critical risk to the security of Tenda WH450 routers. Immediate action is required to mitigate the risk, including applying patches, implementing strict access controls, and monitoring network traffic. The availability of a public exploit increases the urgency for organizations to take proactive measures to protect their networks.