CVE-2022-29864
📋 TL;DR
CVE-2022-29864 is a denial-of-service vulnerability in the OPC UA .NET Standard Stack where an attacker can crash servers by sending a large volume of messages, causing uncontrolled resource consumption. This affects systems using OPC UA for industrial communication and automation. Organizations with OPC UA servers exposed to untrusted networks are particularly vulnerable.
💻 Affected Systems
- OPC UA .NET Standard Stack
📦 What is this software?
Ua .net Standard Stack by Opcfoundation
⚠️ Risk & Real-World Impact
Worst Case
Complete server crash leading to disruption of industrial processes, production downtime, and potential safety implications in critical infrastructure.
Likely Case
Temporary service disruption requiring server restart, causing operational delays and minor production impacts.
If Mitigated
Minimal impact with proper network segmentation and rate limiting in place.
🎯 Exploit Status
Exploitation requires only network access to the OPC UA endpoint and ability to send crafted messages.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 1.04.369 or later
Vendor Advisory: https://files.opcfoundation.org/SecurityBulletins/OPC%20Foundation%20Security%20Bulletin%20CVE-2022-29864.pdf
Restart Required: Yes
Instructions:
1. Download latest OPC UA .NET Standard Stack from official sources. 2. Update all affected applications. 3. Restart OPC UA servers and services. 4. Verify functionality after update.
🔧 Temporary Workarounds
Network Segmentation
allIsolate OPC UA servers from untrusted networks using firewalls and VLANs.
Rate Limiting
allImplement network-level rate limiting on OPC UA traffic to prevent message flooding.
🧯 If You Can't Patch
- Implement strict network access controls to limit OPC UA traffic to trusted sources only.
- Deploy intrusion prevention systems (IPS) with DoS protection capabilities to monitor and block attack traffic.
🔍 How to Verify
Check if Vulnerable:
Check if OPC UA .NET Standard Stack version 1.04.368 is installed in your applications.Check Version:
Check application dependencies or assembly version of OPC.UA.Core.dllVerify Fix Applied:
Verify OPC UA .NET Standard Stack version is 1.04.369 or later and test server stability under normal load.📡 Detection & Monitoring
Log Indicators:
- Unusually high message rates
- Server crash/restart events
- Memory exhaustion warnings
Network Indicators:
- High volume of OPC UA messages from single source
- Abnormal traffic patterns to OPC UA ports (typically 4840)
SIEM Query:
source="OPC_UA_Server" AND (event_type="crash" OR memory_usage>90%)