CVE-2021-22754
📋 TL;DR
This vulnerability allows attackers to execute arbitrary code or cause data loss on systems running vulnerable versions of Schneider Electric's IGSS Definition software. Attack occurs when a malicious CGF file is imported into the Def.exe application. Organizations using IGSS Definition V15.0.0.21140 or earlier are affected.
💻 Affected Systems
- Schneider Electric IGSS Definition (Def.exe)
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution with SYSTEM/administrator privileges leading to complete system compromise, data theft, or ransomware deployment.
Likely Case
Application crash and data loss from file corruption, with potential for limited code execution in user context.
If Mitigated
Application crash without code execution if memory protections like ASLR/DEP are effective.
🎯 Exploit Status
Requires user to import malicious CGF file; exploitation depends on bypassing memory protections.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: V15.0.0.21141 or later
Vendor Advisory: http://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2021-159-01
Restart Required: Yes
Instructions:
1. Download updated version from Schneider Electric portal. 2. Backup configuration files. 3. Run installer as administrator. 4. Restart system after installation.
🔧 Temporary Workarounds
Restrict CGF file imports
windowsBlock import of CGF files through application policies or user training
Application whitelisting
windowsUse AppLocker or similar to restrict execution of Def.exe to trusted users only
🧯 If You Can't Patch
- Implement strict file validation for CGF imports
- Restrict network access to IGSS systems and monitor for suspicious file activity
🔍 How to Verify
Check if Vulnerable:
Check Def.exe version in Help > About; if version is 15.0.0.21140 or lower, system is vulnerable.Check Version:
Right-click Def.exe > Properties > Details tab, or check Help > About in applicationVerify Fix Applied:
Verify version is 15.0.0.21141 or higher in Help > About dialog.📡 Detection & Monitoring
Log Indicators:
- Application crashes of Def.exe
- Unusual file import activity in application logs
Network Indicators:
- Unexpected file transfers to IGSS systems
- Anomalous outbound connections from IGSS hosts
SIEM Query:
EventID=1000 OR EventID=1001 AND ProcessName="Def.exe"