Executive Summary

A critical vulnerability, CVE-2025-70521, has been identified in the Fanvil x7a firmware version 2.6.0.1182. This vulnerability allows unauthenticated attackers to inject commands and execute code on the underlying Android operating system, posing a significant risk to affected systems. The vulnerability has a CVSS score of 9.8, indicating a high severity level.

Technical Analysis

The vulnerability exists in the management portal's diagnostic ping tool of the Fanvil x7a firmware. Specifically, the tool does not handle user-supplied input securely, allowing attackers to inject commands and run code in the underlying Android operating system. This is a classic example of a CWE-77 vulnerability, also known as a command injection vulnerability. The attack vector is network-based, and an attacker can exploit this vulnerability without any authentication or user interaction.

How It Gets Exploited

An unauthenticated remote attacker on the same network can send a crafted request to the diagnostic ping tool, injecting malicious commands that will be executed on the underlying Android operating system. For example, an attacker may send a request with a specially crafted ping command, which would be executed with elevated privileges, allowing the attacker to achieve arbitrary code execution. This could enable the attacker to pivot to internal systems, access sensitive data, or disrupt operations.

Impact Assessment

The Fanvil x7a firmware version 2.6.0.1182 is affected by this vulnerability. An attacker can achieve arbitrary code execution, which could lead to a range of impacts, including data exfiltration, privilege escalation, and denial-of-service (DoS). The CVSS score of 9.8 indicates a critical severity level, and immediate action is required to secure affected systems.

Recommended Actions

To mitigate this vulnerability, administrators should update the Fanvil x7a firmware to a version that addresses this vulnerability. Specifically, they should apply the latest firmware patch from the vendor. Additionally, administrators should:
  • Block access to the diagnostic ping tool from untrusted networks
  • Implement network segmentation to limit the attack surface
  • Monitor system logs for suspicious activity

Sources

  • National Vulnerability Database (NVD)
  • Fanvil website
  • Darkpoint.ca blog post