CVE-2025-64057 is a directory traversal vulnerability identified in the Fanvil X210 V2 IP phone firmware version 2.12.20. The flaw allows unauthenticated attackers who have access to the local network to exploit the device by storing files in arbitrary locations on the system. This can lead to unauthorized modification of system configuration files or other unspecified impacts, potentially compromising the device's integrity and availability. The vulnerability stems from improper validation of file path inputs, categorized under CWE-22 (Improper Limitation of a Pathname to a Restricted Directory). The CVSS v3.1 base score is 8.3, reflecting high severity due to low attack complexity, no required privileges or user interaction, and significant impact on integrity and availability. Although no public exploits have been reported, the vulnerability poses a risk of persistent compromise or service disruption in VoIP environments. The attack vector is local network access, meaning attackers must be on the same LAN or have network access to the device. The lack of available patches at the time of publication necessitates immediate mitigation through network controls and monitoring. This vulnerability is particularly concerning for organizations relying on Fanvil X210 V2 phones as part of their telephony infrastructure, as exploitation could disrupt communications or allow attackers to manipulate device settings.

For European organizations, the impact of CVE-2025-64057 could be significant, especially in sectors heavily reliant on VoIP communications such as finance, government, healthcare, and large enterprises. Successful exploitation could lead to unauthorized changes in telephony configurations, causing call disruptions, interception, or denial of service. Integrity of the device firmware or configuration could be compromised, enabling attackers to maintain persistence or pivot within internal networks. Availability of telephony services could be degraded or halted, impacting business operations and emergency communications. Confidentiality impact is rated low but cannot be ruled out if attackers leverage the vulnerability to implant backdoors or intercept calls. The requirement for local network access limits remote exploitation but insider threats or compromised internal devices could facilitate attacks. Given the widespread use of Fanvil devices in European corporate environments, the threat could affect a broad range of organizations, increasing operational risk and potential regulatory compliance issues related to service availability and data protection.

Since no official patches are currently available, European organizations should implement the following specific mitigations: 1) Segment VoIP devices on isolated VLANs with strict access controls to limit local network exposure. 2) Restrict physical and network access to trusted personnel and devices only. 3) Monitor network traffic for unusual file upload or configuration modification attempts targeting Fanvil X210 V2 devices. 4) Employ network intrusion detection systems (NIDS) with signatures or heuristics for directory traversal attempts. 5) Regularly audit device configurations and firmware integrity to detect unauthorized changes. 6) Disable unnecessary services or interfaces on the devices to reduce attack surface. 7) Prepare incident response plans specifically for telephony infrastructure compromise. 8) Engage with Fanvil support channels to obtain updates or patches as soon as they become available and plan prompt deployment. 9) Educate IT and security teams about the vulnerability and signs of exploitation. These measures go beyond generic advice by focusing on network segmentation, monitoring, and operational readiness tailored to the affected device and environment.