CVE-2025-32766
📋 TL;DR
A stack-based buffer overflow vulnerability in Fortinet FortiWeb CLI allows privileged attackers to execute arbitrary code or commands via crafted CLI commands. This affects FortiWeb versions 7.6.0 through 7.6.3 and versions before 7.4.8. Attackers with administrative CLI access can potentially gain full system control.
💻 Affected Systems
- Fortinet FortiWeb
📦 What is this software?
Fortiweb by Fortinet
Fortiweb by Fortinet
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining root-level access, installing persistent backdoors, pivoting to other systems, and exfiltrating sensitive data.
Likely Case
Privileged attacker executes arbitrary commands to disrupt services, modify configurations, or establish foothold for further attacks.
If Mitigated
Attack fails due to proper access controls, patch management, and network segmentation limiting attacker access.
🎯 Exploit Status
Requires authenticated privileged access; exploitation requires specific knowledge of vulnerable CLI commands.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 7.6.4 and 7.4.8
Vendor Advisory: https://fortiguard.fortinet.com/psirt/FG-IR-25-383
Restart Required: No
Instructions:
1. Backup current configuration. 2. Download and install FortiWeb firmware version 7.6.4 or 7.4.8 from Fortinet support portal. 3. Apply patch via web interface or CLI. 4. Verify successful update.
🔧 Temporary Workarounds
Restrict CLI Access
allLimit CLI access to trusted administrators only using access control lists and strong authentication.
config system admin
edit admin_user
set trusthost1 192.168.1.0 255.255.255.0
end
Enable CLI Session Logging
allEnable detailed logging of all CLI sessions for monitoring and detection.
config log syslogd setting
set status enable
set server 'log_server_ip'
end
🧯 If You Can't Patch
- Implement strict network segmentation to isolate FortiWeb management interfaces from untrusted networks.
- Enforce multi-factor authentication and principle of least privilege for all administrative accounts.
🔍 How to Verify
Check if Vulnerable:
Check FortiWeb firmware version via web interface (System > Dashboard) or CLI command 'get system status'.Check Version:
get system status | grep VersionVerify Fix Applied:
Verify firmware version is 7.6.4 or higher, or 7.4.8 or higher after patching.📡 Detection & Monitoring
Log Indicators:
- Unusual CLI command patterns
- Multiple failed authentication attempts followed by successful CLI login
- Execution of unexpected system commands
Network Indicators:
- Unusual traffic from FortiWeb management interface
- Suspicious outbound connections from FortiWeb
SIEM Query:
source="fortiweb" AND (event_type="cli_command" AND command="*crafted*" OR severity="critical")