CVE-2021-42796
📋 TL;DR
This vulnerability allows unauthenticated attackers to execute arbitrary commands on AVEVA Edge systems. It affects all versions R2020 and prior, potentially compromising industrial control systems and operational technology environments.
💻 Affected Systems
- AVEVA Edge (formerly InduSoft Web Studio)
📦 What is this software?
Edge by Aveva
Edge by Aveva
Edge by Aveva
Edge by Aveva
⚠️ Risk & Real-World Impact
Worst Case
Complete system takeover, disruption of industrial processes, data theft, and potential physical damage to critical infrastructure.
Likely Case
Unauthenticated remote code execution leading to system compromise, data exfiltration, and lateral movement within OT networks.
If Mitigated
Limited impact if systems are isolated, patched, and have proper network segmentation with strict access controls.
🎯 Exploit Status
CISA advisory confirms active exploitation. Simple command injection via ExecuteCommand() function.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: R2021 and later
Vendor Advisory: https://www.aveva.com/en/products/edge/
Restart Required: Yes
Instructions:
1. Upgrade to AVEVA Edge R2021 or later. 2. Download from AVEVA customer portal. 3. Install update following vendor instructions. 4. Restart affected systems.
🔧 Temporary Workarounds
Network Segmentation
allIsolate AVEVA Edge systems from untrusted networks and internet access
Firewall Rules
allRestrict network access to AVEVA Edge systems using firewall rules
🧯 If You Can't Patch
- Implement strict network segmentation and isolate vulnerable systems
- Deploy application whitelisting to prevent unauthorized command execution
🔍 How to Verify
Check if Vulnerable:
Check AVEVA Edge version in application or Windows Programs and Features. Versions R2020 or earlier are vulnerable.Check Version:
Check AVEVA Edge About dialog or Windows registry: HKEY_LOCAL_MACHINE\SOFTWARE\AVEVA\EdgeVerify Fix Applied:
Confirm version is R2021 or later. Test ExecuteCommand() functionality with safe commands.📡 Detection & Monitoring
Log Indicators:
- Unusual command execution via ExecuteCommand()
- Unexpected process creation from AVEVA Edge
- Failed authentication attempts followed by command execution
Network Indicators:
- Unusual network connections from AVEVA Edge systems
- Command and control traffic from OT systems
- Unexpected protocol usage on AVEVA Edge ports
SIEM Query:
source="AVEVA Edge" AND (event_type="command_execution" OR process_name="cmd.exe" OR process_name="powershell.exe")