CVE-2025-9365
📋 TL;DR
Fuji Electric FRENIC-Loader 4 contains a deserialization vulnerability when importing files through a specific window, allowing attackers to execute arbitrary code on affected systems. This affects organizations using FRENIC-Loader 4 for managing Fuji Electric variable frequency drives. The vulnerability requires an attacker to trick a user into importing a malicious file.
💻 Affected Systems
- Fuji Electric FRENIC-Loader 4
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full control of the workstation running FRENIC-Loader, potentially leading to industrial control system manipulation, data theft, or ransomware deployment.
Likely Case
Local privilege escalation leading to unauthorized access to the engineering workstation, configuration file manipulation, or disruption of drive programming operations.
If Mitigated
Limited impact with proper network segmentation and user awareness training preventing malicious file import attempts.
🎯 Exploit Status
Exploitation requires user interaction to import a malicious file. No public exploit code is currently available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: FRENIC-Loader 4 version with security update (check vendor advisory)
Vendor Advisory: https://felib.fujielectric.co.jp/en/M10009/M20029/document_detail/b2f23970-e560-4961-8013-fc72be43681a
Restart Required: Yes
Instructions:
1. Download the security update from Fuji Electric's support portal. 2. Backup existing configurations. 3. Install the update following vendor instructions. 4. Restart the system. 5. Verify the update was successful.
🔧 Temporary Workarounds
Restrict file import permissions
windowsLimit user permissions to prevent unauthorized file imports through FRENIC-Loader interface
Implement application whitelisting
windowsUse Windows AppLocker or similar to restrict execution to trusted applications only
🧯 If You Can't Patch
- Implement strict network segmentation to isolate FRENIC-Loader systems from untrusted networks
- Train users to never import files from untrusted sources and implement file type restrictions
🔍 How to Verify
Check if Vulnerable:
Check if FRENIC-Loader 4 is installed on the system and verify the version against the vendor advisoryCheck Version:
Check FRENIC-Loader 'About' dialog or installation directory for version informationVerify Fix Applied:
Verify the installed version matches or exceeds the patched version specified in the vendor advisory📡 Detection & Monitoring
Log Indicators:
- Unusual file import activities in FRENIC-Loader logs
- Unexpected process execution following file imports
- Security software alerts for suspicious behavior
Network Indicators:
- Unusual outbound connections from FRENIC-Loader systems
- File transfers to/from engineering workstations
SIEM Query:
Process creation events from FRENIC-Loader.exe followed by suspicious child processes OR File import events in application logs