CVE-2023-52891
📋 TL;DR
This vulnerability affects Siemens industrial software products using a vulnerable OPC UA Server SDK. It allows attackers to cause high load and memory exhaustion, potentially blocking affected servers. The vulnerability impacts SIMATIC Energy Manager, SIMATIC IPC DiagBase/DiagMonitor, and SIMIT simulation software.
💻 Affected Systems
- SIMATIC Energy Manager Basic
- SIMATIC Energy Manager PRO
- SIMATIC IPC DiagBase
- SIMATIC IPC DiagMonitor
- SIMIT V10
- SIMIT V11
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete server unavailability due to memory exhaustion, disrupting industrial monitoring and control systems.
Likely Case
Degraded performance or temporary service interruption affecting energy management and diagnostic functions.
If Mitigated
Minimal impact with proper network segmentation and monitoring in place.
🎯 Exploit Status
Similar to CVE-2023-27321; likely requires network access to OPC UA endpoint
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: V7.5 for Energy Manager, V11.1 for SIMIT V11
Vendor Advisory: https://cert-portal.siemens.com/productcert/html/ssa-088132.html
Restart Required: Yes
Instructions:
1. Download updated versions from Siemens Industrial Security. 2. Backup configurations. 3. Install updates following Siemens documentation. 4. Restart affected services/systems.
🔧 Temporary Workarounds
Network Segmentation
allIsolate affected systems from untrusted networks
OPC UA Endpoint Restriction
windowsRestrict access to OPC UA server endpoints using firewall rules
netsh advfirewall firewall add rule name="Block OPC UA" dir=in action=block protocol=TCP localport=4840,4841
🧯 If You Can't Patch
- Implement strict network segmentation to isolate affected systems
- Monitor for abnormal memory usage and OPC UA connection attempts
🔍 How to Verify
Check if Vulnerable:
Check software versions against affected lists; verify OPC UA SDK version if accessibleCheck Version:
Check via Siemens software interfaces or Windows Programs and FeaturesVerify Fix Applied:
Confirm installation of patched versions (V7.5+ for Energy Manager, V11.1+ for SIMIT V11)📡 Detection & Monitoring
Log Indicators:
- Unusual memory consumption patterns
- OPC UA connection spikes
- Service restart events
Network Indicators:
- Excessive OPC UA traffic to port 4840/4841
- Multiple connection attempts from single sources
SIEM Query:
source="*opc*" AND (event_type="high_memory" OR event_type="connection_flood")