CVE-2021-22664
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on affected CNCSoft-B systems by exploiting an out-of-bounds write condition. Industrial control systems using Delta Electronics CNCSoft-B versions 1.0.0.3 and earlier are affected, potentially compromising manufacturing and automation equipment.
💻 Affected Systems
- Delta Electronics CNCSoft-B
📦 What is this software?
Cncsoft B by Criticalmanufacturing
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to take control of industrial equipment, disrupt manufacturing processes, or pivot to other industrial network systems.
Likely Case
Remote code execution leading to data theft, process manipulation, or installation of persistent malware on industrial control systems.
If Mitigated
Limited impact if systems are isolated in air-gapped networks with strict access controls and monitoring.
🎯 Exploit Status
ZDI-21-444 advisory includes technical details. Exploitation requires network access to vulnerable systems.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 1.0.0.4 or later
Vendor Advisory: https://www.deltaww.com/en-US/Service/DownloadCenter
Restart Required: Yes
Instructions:
1. Download latest CNCSoft-B version from Delta Electronics website. 2. Backup current configuration. 3. Install update following vendor instructions. 4. Restart system and verify operation.
🔧 Temporary Workarounds
Network Segmentation
allIsolate CNC systems in separate network segments with strict firewall rules
Access Control
allRestrict network access to CNC systems using IP whitelisting
🧯 If You Can't Patch
- Implement strict network segmentation and firewall rules to limit access to CNC systems
- Deploy intrusion detection systems and monitor for anomalous network traffic to CNC ports
🔍 How to Verify
Check if Vulnerable:
Check CNCSoft-B version in Help > About menu. If version is 1.0.0.3 or earlier, system is vulnerable.Check Version:
Check Help > About menu in CNCSoft-B applicationVerify Fix Applied:
Verify version shows 1.0.0.4 or later in Help > About menu after update.📡 Detection & Monitoring
Log Indicators:
- Unusual process creation from CNCSoft-B
- Failed authentication attempts to CNC system
- Unexpected network connections to CNC ports
Network Indicators:
- Unusual traffic to CNC system ports (typically TCP 502 for Modbus)
- Anomalous outbound connections from CNC systems
SIEM Query:
source="cnc_logs" AND (event_type="process_creation" OR event_type="network_connection") AND process_name="CNCSoft-B.exe"