EUVD-2025-4511

Comprehensive Technical Analysis of EUVD-2025-4511

1. Vulnerability Assessment and Severity Evaluation

The vulnerability EUVD-2025-4511, also known as CVE-2025-25664, pertains to a stack overflow in the Tenda AC8V4 V16.03.34.06 firmware. The stack overflow occurs via the shareSpeed parameter in the sub_49E098 function. 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): The vulnerability is exploitable over the network.
• AC:L (Attack Complexity: Low): The attack requires low complexity to execute.
• PR:N (Privileges Required: None): No privileges are required to exploit the vulnerability.
• UI:N (User Interaction: None): No user interaction is required.
• S:U (Scope: Unchanged): The vulnerability does not change the security scope.
• C:H (Confidentiality: High): The vulnerability has a high impact on confidentiality.
• I:H (Integrity: High): The vulnerability has a high impact on integrity.
• A:H (Availability: High): The vulnerability has a high impact on availability.

2. Potential Attack Vectors and Exploitation Methods

Given the nature of the stack overflow vulnerability, potential attack vectors include:

• Remote Code Execution (RCE): An attacker could send specially crafted network packets to the shareSpeed parameter, leading to arbitrary code execution on the device.
• Denial of Service (DoS): The stack overflow could cause the device to crash, resulting in a denial of service.
• Information Disclosure: The vulnerability might allow an attacker to read sensitive information from the device's memory.

Exploitation methods could involve crafting malicious packets that target the shareSpeed parameter, leveraging tools like Metasploit or custom scripts to automate the attack.

3. Affected Systems and Software Versions

The vulnerability specifically affects the Tenda AC8V4 router with firmware version V16.03.34.06. Other versions of the firmware and other Tenda devices may also be affected, but this has not been confirmed. Users and administrators should verify the firmware version of their Tenda AC8V4 routers to determine if they are at risk.

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 version that addresses this vulnerability. Tenda should release a patched version as soon as possible.
• Network Segmentation: Isolate the affected devices on a separate network segment to limit potential attack vectors.
• Firewall Rules: Implement strict firewall rules to restrict access to the device, allowing only trusted IP addresses.
• Intrusion Detection/Prevention Systems (IDS/IPS): Deploy IDS/IPS to monitor and block suspicious network traffic targeting the shareSpeed parameter.
• Regular Audits: Conduct regular security audits and vulnerability assessments to identify and address similar issues proactively.

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, it could be exploited by threat actors to compromise network security, steal sensitive information, or disrupt services. The widespread use of routers in both home and enterprise environments amplifies the potential impact.

6. Technical Details for Security Professionals

For security professionals, the following technical details are pertinent:

• Vulnerable Function: The stack overflow occurs in the sub_49E098 function when processing the shareSpeed parameter.
• Exploit Development: Crafting an exploit would involve sending a specially crafted packet to the router that overflows the stack buffer associated with the shareSpeed parameter.
• Detection: Monitor network traffic for unusual patterns targeting the shareSpeed parameter. Use tools like Wireshark to analyze packet contents.
• Patch Analysis: Review the patched firmware to understand the changes made to mitigate the vulnerability. This can provide insights into similar issues in other devices.
• References:
  • NVD Entry
  • GitHub Repository

In conclusion, EUVD-2025-4511 represents a critical vulnerability that requires immediate attention from both Tenda and users of the affected device. Proactive mitigation strategies and continuous monitoring are essential to safeguard against potential exploitation.