CVE-2025-64155
📋 TL;DR
This CVE describes an OS command injection vulnerability in Fortinet FortiSIEM that allows attackers to execute arbitrary commands via crafted TCP requests. The vulnerability affects multiple FortiSIEM versions from 6.7.0 through 7.4.0. With a CVSS score of 9.8, this represents a critical security risk requiring immediate attention.
💻 Affected Systems
- Fortinet FortiSIEM
📦 What is this software?
Fortisiem by Fortinet
Fortisiem by Fortinet
Fortisiem by Fortinet
Fortisiem by Fortinet
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attacker to execute arbitrary commands with high privileges, potentially leading to data exfiltration, ransomware deployment, or lateral movement within the network.
Likely Case
Unauthorized command execution leading to data theft, installation of backdoors, or disruption of security monitoring capabilities.
If Mitigated
Limited impact if proper network segmentation and access controls prevent exploitation attempts from reaching vulnerable systems.
🎯 Exploit Status
Multiple public proof-of-concept exploits are available. The vulnerability can be exploited without authentication via TCP requests.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: FortiSIEM 7.4.1, 7.3.5, 7.1.9, 7.0.5, 6.7.11
Vendor Advisory: https://fortiguard.fortinet.com/psirt/FG-IR-25-772
Restart Required: Yes
Instructions:
1. Download the appropriate patch from Fortinet support portal. 2. Backup current configuration. 3. Apply the patch following Fortinet's upgrade documentation. 4. Restart the FortiSIEM services. 5. Verify the patch was applied successfully.
🔧 Temporary Workarounds
Network Access Restriction
linuxRestrict network access to FortiSIEM management interfaces to trusted IP addresses only
iptables -A INPUT -p tcp --dport [FortiSIEM_port] -s [trusted_ip] -j ACCEPT
iptables -A INPUT -p tcp --dport [FortiSIEM_port] -j DROP
Disable Unnecessary Services
linuxDisable any unnecessary network services on FortiSIEM that might expose the vulnerable component
systemctl disable [unnecessary_service]
systemctl stop [unnecessary_service]
🧯 If You Can't Patch
- Implement strict network segmentation to isolate FortiSIEM from untrusted networks
- Deploy network-based intrusion prevention systems (IPS) with rules to detect and block exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check FortiSIEM version via web interface or CLI. If version matches affected range and patch not applied, system is vulnerable.Check Version:
ssh admin@fortisiem_ip 'show version' or check via web interface under System > StatusVerify Fix Applied:
Verify FortiSIEM version is updated to patched version (7.4.1, 7.3.5, 7.1.9, 7.0.5, or 6.7.11) and test with known exploit attempts.📡 Detection & Monitoring
Log Indicators:
- Unusual command execution patterns in system logs
- Failed authentication attempts followed by successful command execution
- Suspicious process creation from FortiSIEM services
Network Indicators:
- Unusual TCP traffic patterns to FortiSIEM management ports
- Malformed TCP packets targeting FortiSIEM services
- Command injection patterns in network traffic
SIEM Query:
source="fortisiem" AND (event_type="command_execution" OR process_name="sh" OR process_name="bash") AND user!="authorized_user"