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How the Mentioned CVE Works
The vulnerability CVE-2025-64057 is a path traversal flaw in the web interface of the Fanvil X210 V2 IP phone (firmware 2.12.20). It resides in a specific, undisclosed HTTP endpoint intended for file operations. An attacker on the local network can send a crafted HTTP request without authentication. The exploit manipulates the ‘filename’ or ‘filepath’ parameter by inserting directory traversal sequences like ../../../../. The application fails to sanitize or validate this input, treating it as relative to the device’s root filesystem. This allows the attacker to break out of the intended upload directory. Consequently, arbitrary files can be written to any location the web service process has permission to access. The primary risk is storing a malicious file to overwrite or create critical system files. For example, an attacker could modify network configuration, alter boot scripts, or plant a backdoor shell. If the web service runs with elevated privileges, the impact is full system compromise. This flaw poses a significant threat as it is network-accessible and requires no user interaction or credentials.
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Platform: Fanvil X210 V2
Version: 2.12.20
Vulnerability: Directory Traversal
Severity: Critical
date: 2025-12-05
Prediction: 2026-01-15
What Undercode Say:
curl -X POST http://<TARGET_IP>/vulnerable_endpoint \ -F "[email protected]" \ -F "path=../../../../etc/config/malicious.conf"
How Exploit:
Craft HTTP POST request with traversal sequences (../../../) in file path parameter to write arbitrary files outside the intended directory, potentially to `/etc/` or /www/, enabling configuration hijack or backdoor installation.
Protection from this CVE
Block phone’s web interface from network access via firewall. Apply vendor firmware patch immediately upon release. Restrict web service process privileges if possible.
Impact:
Unauthenticated remote system compromise, configuration modification, potential device takeover and persistence on the local network.
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Sources:
Reported By: nvd.nist.gov
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