# CVE-2025-64056: Fanvil x210 V2 unauthenticated arbitrary file upload in webconfig

Source: https://junglewise.ai/threats/cve-2025-64056-fanvil-x210-v2-unauthenticated-arbitrary-file-upload-in-webconfig  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2025-12-05. Updated: 2026-07-05  
License: CC BY 4.0 with a link back

CVE-2025-64056 · Severity: medium · CVSS 4.3 · Published 2025-12-05

The Fanvil x210 V2 is a high-end enterprise IP phone used for business communications. A security flaw in its web-based configuration tool allows an unauthorized person on the same local network to upload and store files on the device's internal memory. This could allow an attacker to disrupt the phone's operation or modify its settings, potentially impacting business communications and device reliability.

Technologies: [Fanvil X210](https://junglewise.ai/threats/technologies/x210), [Fanvil X210 V2](https://junglewise.ai/threats/technologies/x210-v2), [Fanvil X210 Firmware](https://junglewise.ai/threats/technologies/x210-firmware). Vendors: [Fanvil](https://junglewise.ai/threats/vendors/fanvil).

## Quick answers

**Is CVE-2025-64056 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-64056 being exploited in the wild.

**How severe is CVE-2025-64056?** Medium severity, with a CVSS score of 4.3, published 5 December 2025.

**Which products and versions are affected?** Fanvil X210 V2 2.12.20.

**Is there a fix for CVE-2025-64056?** A patch was published on 2025-04-28: Firmware v2.12.22.2 released Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2025-64056 attacked?** It is attacked from the adjacent network, in a network appliance.

**Am I affected by CVE-2025-64056?** Check whether you run Fanvil X210, Fanvil X210 V2 or Fanvil X210 Firmware at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An arbitrary file write vulnerability exists in the web configuration interface of Fanvil x210 V2 firmware version 2.12.20. The vulnerability stems from a lack of input validation and sanitization in the 'upload/dest' parameter of the webconfig CGI script, which handles font and translation file uploads. Because the web service (httpd) runs with root privileges, an unauthenticated attacker on the local network (adjacent) can use path traversal or direct path injection to write files to any location on the filesystem. This can be used to overwrite critical system files or configuration data. The issue is addressed in firmware version 2.12.22.2.

## Affected products

- Fanvil x210 V2 2.12.20

## Timeline

- 2025-03-01: other: Vulnerability discovered
- 2025-03-04: other: Initial contact with vendor
- 2025-04-28: patched: Firmware v2.12.22.2 released
- 2025-12-05: disclosed: Public disclosure and CVE assignment

## References

- [https://github.com/SpikeReply/advisories/blob/main/cve/fanvil/cve-2025-64056.md](https://github.com/SpikeReply/advisories/blob/main/cve/fanvil/cve-2025-64056.md)

## Related threats

- [Fanvil x210 reflected XSS in upload page](https://junglewise.ai/threats/cve-2025-64054-fanvil-x210-reflected-xss-in-upload-page)
- [Fanvil x210 buffer overflow in webconfig upload](https://junglewise.ai/threats/cve-2025-64053-fanvil-x210-buffer-overflow-in-webconfig-upload)
- [Fanvil x210 V2 command injection in web configuration interface](https://junglewise.ai/threats/cve-2025-64052-fanvil-x210-v2-command-injection-in-web-configuration-interface)
- [Fanvil x210 V2 directory traversal and RCE in web interface](https://junglewise.ai/threats/cve-2025-64057-fanvil-x210-v2-directory-traversal-and-rce-in-web-interface)
- [Fanvil x210 V2 authentication bypass in httpd cgi-bin](https://junglewise.ai/threats/cve-2025-64055-fanvil-x210-v2-authentication-bypass-in-httpd-cgi-bin)