CVE-2025-47857
📋 TL;DR
This CVE describes an OS command injection vulnerability in Fortinet FortiWeb's command-line interface that allows privileged attackers to execute arbitrary commands. Affected systems include FortiWeb versions 7.6.0 through 7.6.3 and all versions before 7.4.8. Attackers with administrative CLI access can exploit this to gain unauthorized command execution.
💻 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, exfiltrating sensitive data, and pivoting to other network segments.
Likely Case
Privileged attacker executes arbitrary commands to modify configurations, disable security controls, or deploy malware on the FortiWeb appliance.
If Mitigated
Limited impact due to network segmentation, restricted administrative access, and proper monitoring detecting anomalous CLI activity.
🎯 Exploit Status
Requires authenticated privileged access; specific CLI commands with crafted parameters needed for exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 7.6.4 or 7.4.8 and later
Vendor Advisory: https://fortiguard.fortinet.com/psirt/FG-IR-25-253
Restart Required: No
Instructions:
1. Backup current configuration. 2. Download appropriate firmware version (7.6.4 or 7.4.8+) from Fortinet support portal. 3. Upload firmware via web GUI or CLI. 4. Install update following vendor documentation. 5. Verify successful upgrade and restore configuration if needed.
🔧 Temporary Workarounds
Restrict CLI Access
allLimit administrative CLI access to trusted IP addresses and users only.
config system admin
edit admin_user
set trusthost1 <trusted_ip> <mask>
end
Enable Command Logging
allEnable detailed logging of all CLI commands for monitoring and detection.
config log syslogd setting
set status enable
set server <syslog_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 CLI: 'get system status' or web GUI: System > Dashboard > System Information.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 using same commands.📡 Detection & Monitoring
Log Indicators:
- Unusual CLI command patterns, especially with special characters or shell metacharacters
- Multiple failed authentication attempts followed by successful CLI login
- Commands attempting to spawn shells or execute system binaries
Network Indicators:
- Unexpected outbound connections from FortiWeb management interface
- Anomalous traffic patterns from FortiWeb to internal systems
SIEM Query:
source="fortiweb" AND (event_type="cli_command" AND command="*[;&|`$()]*") OR (auth_result="success" AND source_ip NOT IN [trusted_admin_ips])