CVE-2022-30792
📋 TL;DR
CVE-2022-30792 is a denial-of-service vulnerability in CODESYS V3's CmpChannelServer component that allows unauthorized attackers to consume resources and block new communication channel connections. Existing connections remain unaffected, but new connections cannot be established. This affects multiple versions of CODESYS V3 software used in industrial control systems.
💻 Affected Systems
- CODESYS V3
📦 What is this software?
Control For Wago Touch Panels 600 by Codesys
Control Rte Sl \(for Beckhoff Cx\) by Codesys
View all CVEs affecting Control Rte Sl \(for Beckhoff Cx\) →
Control Win by Codesys
Gateway by Codesys
Hmi by Codesys
⚠️ Risk & Real-World Impact
Worst Case
Complete denial of service for new connections to CODESYS systems, potentially disrupting industrial operations that rely on establishing new communication channels for monitoring or control.
Likely Case
Temporary service disruption where new devices or connections cannot establish communication with the CODESYS system until the attack stops or system is restarted.
If Mitigated
Limited impact with proper network segmentation and monitoring, allowing quick detection and response to connection blocking attempts.
🎯 Exploit Status
The vulnerability allows unauthenticated exploitation by sending specially crafted requests to consume resources and block new connections.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for specific patched versions
Vendor Advisory: https://customers.codesys.com/index.php?eID=dumpFile&t=f&f=17128&token=bee4d8a57f19be289d623ec90135493b5f9179e3&download=
Restart Required: Yes
Instructions:
1. Download the patch from CODESYS customer portal. 2. Apply the patch to affected CODESYS V3 installations. 3. Restart the CODESYS services or system. 4. Verify the patch is applied correctly.
🔧 Temporary Workarounds
Network Segmentation
allRestrict network access to CODESYS systems to trusted networks only
Connection Rate Limiting
allImplement rate limiting on connection attempts to the CmpChannelServer
🧯 If You Can't Patch
- Implement strict network access controls to limit who can reach CODESYS systems
- Deploy network monitoring and intrusion detection to alert on unusual connection patterns
🔍 How to Verify
Check if Vulnerable:
Check CODESYS version against affected versions listed in vendor advisoryCheck Version:
Check CODESYS About dialog or system information within the CODESYS development environmentVerify Fix Applied:
Verify CODESYS version is updated to patched version and test new connection establishment📡 Detection & Monitoring
Log Indicators:
- Unusual number of failed connection attempts
- Resource exhaustion warnings in CODESYS logs
- New connections being blocked unexpectedly
Network Indicators:
- High volume of connection attempts to CODESYS ports
- Unusual traffic patterns to CmpChannelServer component
SIEM Query:
source="codesys" AND ("connection blocked" OR "resource exhaustion" OR "failed connection")