Overview
A significant security vulnerability, identified as CVE-2025-64053, has been discovered in Fanvil X210 devices running firmware version 2.12.20. This vulnerability is a buffer overflow that could allow attackers to cause a denial-of-service (DoS) condition or potentially execute arbitrary commands on the affected device.
Technical Details
The buffer overflow occurs due to insufficient input validation in the `/cgi-bin/webconfig?page=upload&action=submit` endpoint. A crafted POST request sent to this endpoint can overflow a buffer, leading to unexpected program behavior. An attacker could exploit this by sending a specially crafted request that exceeds the allocated buffer size. The vulnerable component handles file uploads, making it a prime target for exploitation.
CVSS Analysis
Currently, the CVSS score and severity for CVE-2025-64053 are listed as N/A. This indicates that the vulnerability has not yet been formally scored. However, given the potential for denial-of-service and arbitrary command execution, it is likely to be rated as high or critical severity once a CVSS score is assigned. We recommend closely monitoring the NIST National Vulnerability Database for updates.
Possible Impact
The exploitation of CVE-2025-64053 could have the following consequences:
- Denial of Service (DoS): The most immediate impact is a denial of service, rendering the Fanvil X210 device unusable. This could disrupt critical communication services.
- Remote Code Execution (RCE): With careful crafting of the payload, an attacker may be able to execute arbitrary commands on the device. This could lead to complete system compromise, allowing the attacker to steal sensitive information, install malware, or use the device as a bot in a botnet.
Mitigation and Patch Steps
At the time of writing, official mitigation steps or a patch from Fanvil may not be available. However, we recommend the following actions:
- Monitor Fanvil’s Website: Regularly check the Fanvil official website for security advisories and firmware updates related to the X210 model.
- Network Segmentation: Isolate the Fanvil X210 devices on a separate network segment to limit the potential impact of a successful exploit.
- Access Control Lists (ACLs): Implement ACLs to restrict access to the `/cgi-bin/webconfig?page=upload&action=submit` endpoint. Only allow access from trusted IP addresses.
- Web Application Firewall (WAF): If possible, deploy a WAF in front of the device to filter out malicious requests targeting the vulnerable endpoint.
- Intrusion Detection/Prevention Systems (IDS/IPS): Configure your IDS/IPS to detect and block attempts to exploit this vulnerability.
Once a firmware update is released, it is crucial to apply it immediately to protect against this vulnerability.
