CVE-2022-50979
📋 TL;DR
This vulnerability allows an unauthenticated attacker on the same network segment to disrupt operations by switching between multiple configuration presets via Modbus (RS485). It affects industrial control systems and devices using Modbus communication. Attackers can cause service disruption without authentication.
💻 Affected Systems
- Innomic industrial control devices using Modbus communication
⚠️ Risk & Real-World Impact
Worst Case
Complete operational disruption of industrial processes, potential safety incidents, or equipment damage from unintended configuration changes.
Likely Case
Temporary service disruption, configuration corruption requiring manual intervention, and operational downtime.
If Mitigated
Minimal impact with proper network segmentation and access controls preventing adjacent network access.
🎯 Exploit Status
Exploitation requires Modbus protocol knowledge and network access to the industrial control segment. No authentication needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for specific patched firmware versions
Vendor Advisory: https://www.innomic.com/.well-known/csaf/white/2026/ids-2026-0001.html
Restart Required: Yes
Instructions:
1. Review vendor advisory for affected devices. 2. Download patched firmware from vendor portal. 3. Apply firmware update following vendor procedures. 4. Restart affected devices. 5. Verify configuration integrity post-update.
🔧 Temporary Workarounds
Network Segmentation
allIsolate Modbus/RS485 networks from other network segments using firewalls or VLANs
Access Control Lists
allImplement strict network access controls to limit Modbus traffic to authorized devices only
🧯 If You Can't Patch
- Implement strict physical security controls for industrial network access points
- Deploy network monitoring and intrusion detection for Modbus protocol anomalies
🔍 How to Verify
Check if Vulnerable:
Check device firmware version against vendor advisory. Monitor for unauthorized Modbus configuration change attempts.Check Version:
Vendor-specific command via device management interface; consult device documentation.Verify Fix Applied:
Verify firmware version matches patched version from vendor advisory. Test that unauthorized configuration changes via Modbus are blocked.📡 Detection & Monitoring
Log Indicators:
- Unauthorized Modbus write requests
- Unexpected configuration preset changes
- Multiple rapid configuration switches
Network Indicators:
- Modbus function code 06 (Write Single Register) or 16 (Write Multiple Registers) from unauthorized sources
- High frequency of Modbus write operations
SIEM Query:
source:modbus AND (function_code:06 OR function_code:16) AND NOT source_ip:[authorized_ips]