CVE-2025-47761
📋 TL;DR
This vulnerability allows authenticated local users on Windows systems to execute arbitrary code through FortiClient's fortips driver when an IPSec VPN connection is active. It affects FortiClientWindows versions 7.4.0-7.4.3 and 7.2.0-7.2.9. Attackers must bypass Windows memory protections and have a valid VPN connection to exploit this exposed IOCTL with insufficient access control.
💻 Affected Systems
- Fortinet FortiClientWindows
📦 What is this software?
Forticlient by Fortinet
Forticlient by Fortinet
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with local privilege escalation to SYSTEM, enabling persistence, credential theft, and lateral movement within the network.
Likely Case
Local privilege escalation allowing attackers to gain administrative privileges on the compromised workstation.
If Mitigated
Limited impact due to Windows memory protections and VPN connection requirement, potentially resulting in failed exploitation attempts.
🎯 Exploit Status
Requires authenticated local access, bypassing Windows memory protections, and an active IPSec VPN connection. Not trivial but feasible for determined attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 7.4.3 and 7.2.9 (check vendor advisory for specific fixed versions)
Vendor Advisory: https://fortiguard.fortinet.com/psirt/FG-IR-25-112
Restart Required: Yes
Instructions:
1. Download latest FortiClient version from Fortinet support portal. 2. Uninstall current vulnerable version. 3. Install updated version. 4. Restart system.
🔧 Temporary Workarounds
Disable IPSec VPN connections
windowsPrevent exploitation by disabling IPSec VPN functionality which is required for the attack.
Configure FortiClient to use SSL VPN instead of IPSec or disable VPN functionality entirely
Restrict local user privileges
windowsLimit local user accounts to standard user privileges to reduce attack surface.
Use Group Policy to enforce least privilege for local user accounts
🧯 If You Can't Patch
- Implement strict endpoint security controls to detect and prevent memory manipulation attempts
- Segment network to limit lateral movement from compromised workstations
🔍 How to Verify
Check if Vulnerable:
Check FortiClient version in About section or via 'wmic product get name,version' for FortiClient entries.Check Version:
wmic product where "name like '%FortiClient%'" get name,versionVerify Fix Applied:
Verify FortiClient version is above 7.4.3 or 7.2.9, and check vendor advisory for specific fixed versions.📡 Detection & Monitoring
Log Indicators:
- Unusual process creation from FortiClient processes
- Suspicious driver access attempts
- Failed memory protection bypass attempts in Windows logs
Network Indicators:
- Unusual outbound connections from workstations with FortiClient
- Anomalous VPN connection patterns
SIEM Query:
Process Creation where (Image contains 'forti' OR ParentImage contains 'forti') AND CommandLine contains suspicious patterns