CVE-2021-27413
📋 TL;DR
CVE-2021-27413 is a stack-based buffer overflow vulnerability in Omron CX-One industrial automation software. Successful exploitation allows remote attackers to execute arbitrary code on affected systems. This affects organizations using Omron CX-One versions 4.60 and prior, including CX-Server versions 5.0.29.0 and prior.
💻 Affected Systems
- Omron CX-One
- CX-Server
📦 What is this software?
Cx One by Omron
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full control over the industrial automation system, potentially leading to production disruption, safety incidents, or data theft.
Likely Case
Remote code execution allowing attackers to install malware, pivot to other systems, or disrupt industrial processes.
If Mitigated
Limited impact if systems are isolated, patched, or have network segmentation preventing exploitation.
🎯 Exploit Status
ZDI published technical details and proof-of-concept. Buffer overflow can be triggered remotely without authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: CX-One version 4.61 or later
Vendor Advisory: https://www.omron.com/global/en/
Restart Required: Yes
Instructions:
1. Download CX-One version 4.61 or later from Omron website
2. Uninstall previous vulnerable versions
3. Install updated version
4. Restart system
🔧 Temporary Workarounds
Network Segmentation
allIsolate Omron CX-One systems from untrusted networks and internet
Firewall Rules
allBlock unnecessary network ports and restrict access to CX-One systems
🧯 If You Can't Patch
- Implement strict network segmentation and firewall rules to isolate vulnerable systems
- Monitor for suspicious network traffic and system behavior
🔍 How to Verify
Check if Vulnerable:
Check installed CX-One version via Control Panel > Programs and FeaturesCheck Version:
wmic product get name,version | findstr /i cx-oneVerify Fix Applied:
Verify CX-One version is 4.61 or later and CX-Server is newer than 5.0.29.0📡 Detection & Monitoring
Log Indicators:
- Unexpected process crashes of CX-One components
- Suspicious network connections to CX-One ports
Network Indicators:
- Unusual traffic patterns to/from CX-One systems
- Exploit attempt signatures in network traffic
SIEM Query:
source="cx-one" AND (event_type="crash" OR event_type="buffer_overflow")