CVE-2021-32996
📋 TL;DR
FANUC R-30iA and R-30iB industrial robot controllers contain integer coercion errors that can cause device crashes requiring restart. This affects manufacturing and industrial environments using these specific robot controllers.
💻 Affected Systems
- FANUC R-30iA
- FANUC R-30iB
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Production line disruption due to controller crashes requiring manual intervention and restart, potentially causing physical damage if robots stop in unsafe positions.
Likely Case
Temporary production stoppage while controllers are restarted, causing minor operational delays.
If Mitigated
Minimal impact with proper network segmentation and monitoring allowing quick detection and recovery.
🎯 Exploit Status
Integer coercion errors typically require specific malformed input to trigger. No public exploit code has been released.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Contact FANUC for specific firmware updates
Vendor Advisory: https://www.cisa.gov/uscert/ics/advisories/icsa-21-243-02
Restart Required: Yes
Instructions:
1. Contact FANUC support for firmware updates. 2. Schedule maintenance window. 3. Backup controller configuration. 4. Apply firmware update. 5. Restart controller. 6. Verify functionality.
🔧 Temporary Workarounds
Network Segmentation
allIsolate robot controllers from general network traffic using firewalls and VLANs
Access Control
allRestrict network access to controllers to only authorized maintenance systems
🧯 If You Can't Patch
- Implement strict network segmentation to isolate controllers
- Monitor controller health and network traffic for anomalous activity
🔍 How to Verify
Check if Vulnerable:
Check controller model and firmware version against FANUC advisoryCheck Version:
Check via FANUC controller interface or maintenance softwareVerify Fix Applied:
Verify firmware version has been updated to patched version from FANUC📡 Detection & Monitoring
Log Indicators:
- Unexpected controller restarts
- Error logs indicating integer overflow or coercion
Network Indicators:
- Unusual network traffic to controller ports
- Multiple connection attempts to controller
SIEM Query:
source="controller_logs" AND (event="crash" OR event="restart")