Advisory Details

December 16th, 2025

Fortinet FortiSandbox upload_vdi_file Command Injection Remote Code Execution Vulnerability

ZDI-25-1096
ZDI-CAN-27308

CVE ID CVE-2025-53949
CVSS SCORE 8.8, AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
AFFECTED VENDORS Fortinet
AFFECTED PRODUCTS FortiSandbox
VULNERABILITY DETAILS

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Fortinet FortiSandbox. Authentication is required to exploit this vulnerability.

The specific flaw exists within the upload_vdi_file endpoint. The issue results from the lack of proper validation of a user-supplied string before using it to execute a system call. An attacker can leverage this vulnerability to execute code in the context of root.
ADDITIONAL DETAILS Fortinet has issued an update to correct this vulnerability. More details can be found at:
https://fortiguard.fortinet.com/psirt/FG-IR-25-479
DISCLOSURE TIMELINE
  • 2025-05-29 - Vulnerability reported to vendor
  • 2025-12-16 - Coordinated public release of advisory
  • 2025-12-16 - Advisory Updated
CREDIT Jason McFadyen of Trend Research
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