CVE-2025-53949
📋 TL;DR
This OS command injection vulnerability in Fortinet FortiSandbox allows authenticated attackers to execute arbitrary commands on the underlying system via crafted HTTP requests. Affected users include organizations running vulnerable FortiSandbox versions 4.0-5.0.2, potentially leading to complete system compromise.
💻 Affected Systems
- Fortinet FortiSandbox
📦 What is this software?
Fortisandbox by Fortinet
Fortisandbox by Fortinet
Fortisandbox by Fortinet
Fortisandbox by Fortinet
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise allowing attacker to install persistent backdoors, exfiltrate sensitive data, pivot to internal networks, and disrupt security operations.
Likely Case
Attacker gains shell access to the FortiSandbox appliance, potentially compromising sandboxed malware analysis and security monitoring functions.
If Mitigated
Limited impact if network segmentation, strict access controls, and monitoring prevent lateral movement and data exfiltration.
🎯 Exploit Status
Exploitation requires authenticated access; command injection vulnerabilities are typically easy to weaponize once details are known.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: FortiSandbox 5.0.3, 4.4.8, and later versions
Vendor Advisory: https://fortiguard.fortinet.com/psirt/FG-IR-25-479
Restart Required: Yes
Instructions:
1. Backup configuration. 2. Download patched firmware from Fortinet support portal. 3. Upload firmware via web GUI. 4. Install update. 5. Reboot appliance.
🔧 Temporary Workarounds
Restrict Administrative Access
allLimit FortiSandbox administrative interface access to trusted IP addresses only.
Configure firewall rules to restrict access to FortiSandbox management IP/ports
Network Segmentation
allIsolate FortiSandbox appliance in dedicated security VLAN with strict egress filtering.
🧯 If You Can't Patch
- Implement strict network access controls to limit FortiSandbox management interface exposure
- Enhance monitoring for unusual process execution and network connections from FortiSandbox appliance
🔍 How to Verify
Check if Vulnerable:
Check FortiSandbox firmware version via web GUI: System > Dashboard > System InformationCheck Version:
show system status (via CLI) or check web GUI dashboardVerify Fix Applied:
Verify firmware version is 5.0.3+, 4.4.8+, or later; check vendor advisory for confirmation.📡 Detection & Monitoring
Log Indicators:
- Unusual command execution in system logs
- Multiple failed authentication attempts followed by successful login
- HTTP requests with shell metacharacters in parameters
Network Indicators:
- Unexpected outbound connections from FortiSandbox appliance
- Traffic to unusual ports from FortiSandbox management interface
SIEM Query:
source="fortisandbox" AND (event_type="command_execution" OR http_uri="*;*" OR http_uri="*|*" OR http_uri="*`*")