EUVD-2025-10038

Comprehensive Technical Analysis of EUVD-2025-10038

1. Vulnerability Assessment and Severity Evaluation

The vulnerability EUVD-2025-10038, also known as CVE-2025-29462, is a buffer overflow issue in Tenda Ac15 V15.13.07.13. This vulnerability arises when the webCgiGetUploadFile function calls the socketRead function to process HTTP request messages, leading to the overwriting of a buffer on the stack.

Severity Evaluation:

• CVSS Base Score: 9.8
• CVSS 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 vector breakdown shows:

• Attack Vector (AV): Network (N)
• Attack Complexity (AC): Low (L)
• Privileges Required (PR): None (N)
• User Interaction (UI): None (N)
• Scope (S): Unchanged (U)
• Confidentiality (C): High (H)
• Integrity (I): High (H)
• Availability (A): High (H)

This high score underscores the severity of the vulnerability, which can be exploited remotely with low complexity and without requiring any user interaction or special privileges.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Remote Exploitation: An attacker can send specially crafted HTTP requests to the vulnerable device, triggering the buffer overflow.
• Network-Based Attacks: Given the network attack vector, the vulnerability can be exploited over the internet or local network.

Exploitation Methods:

• Buffer Overflow: By sending a maliciously crafted HTTP request, an attacker can overwrite the stack buffer, potentially leading to arbitrary code execution.
• Denial of Service (DoS): The buffer overflow can also cause the device to crash, resulting in a denial of service.

3. Affected Systems and Software Versions

Affected Systems:

• Tenda Ac15 devices running firmware version V15.13.07.13.

Software Versions:

• Specifically, the vulnerability is present in the webCgiGetUploadFile function within the firmware version V15.13.07.13.

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Firmware Update: Users should immediately update their Tenda Ac15 devices to a patched firmware version if available.
• Network Segmentation: Isolate vulnerable devices on a separate network segment to limit exposure.
• Firewall Rules: Implement strict firewall rules to block unauthorized access to the device.

Long-Term Mitigation:

• Regular Patch Management: Ensure that all devices are regularly updated with the latest security patches.
• Intrusion Detection Systems (IDS): Deploy IDS to monitor for suspicious network activity.
• Security Audits: Conduct regular security audits and vulnerability assessments.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to European organizations and individuals using Tenda Ac15 devices. Given the widespread use of such devices in both home and enterprise environments, the potential for large-scale exploitation is high. This underscores the need for robust cybersecurity measures and timely patch management practices across the EU.

6. Technical Details for Security Professionals

Vulnerability Details:

• Function: webCgiGetUploadFile
• Trigger: Call to socketRead function
• Impact: Buffer overflow leading to stack corruption

Exploitation Steps:

1. Craft Malicious HTTP Request: Create an HTTP request designed to overflow the buffer.
2. Send Request: Transmit the crafted request to the vulnerable device.
3. Buffer Overflow: The socketRead function processes the request, leading to a buffer overflow.
4. Code Execution: If successful, the attacker can execute arbitrary code on the device.

Detection and Monitoring:

• Log Analysis: Monitor device logs for unusual activity or errors related to HTTP requests.
• Network Traffic Analysis: Use network monitoring tools to detect anomalous HTTP traffic patterns.

Incident Response:

• Containment: Isolate affected devices to prevent further exploitation.
• Eradication: Update firmware and apply necessary patches.
• Recovery: Restore normal operations and monitor for any residual effects.

Conclusion: EUVD-2025-10038 represents a critical vulnerability that requires immediate attention. Organizations and individuals should prioritize updating their Tenda Ac15 devices and implement robust security measures to mitigate the risk of exploitation. The European cybersecurity community should collaborate to ensure widespread awareness and prompt action to address this vulnerability.