CVE-2025-40817
📋 TL;DR
This vulnerability affects Siemens LOGO! programmable logic controllers (PLCs) and their SIPLUS variants. An unauthenticated remote attacker can change the device's system time, potentially causing operational disruptions or unexpected behavior in industrial processes. All versions of the listed devices are vulnerable.
💻 Affected Systems
- LOGO! 12/24RCE
- LOGO! 12/24RCEo
- LOGO! 230RCE
- LOGO! 230RCEo
- LOGO! 24CE
- LOGO! 24CEo
- LOGO! 24RCE
- LOGO! 24RCEo
- SIPLUS LOGO! 12/24RCE
- SIPLUS LOGO! 12/24RCEo
- SIPLUS LOGO! 230RCE
- SIPLUS LOGO! 230RCEo
- SIPLUS LOGO! 24CE
- SIPLUS LOGO! 24CEo
- SIPLUS LOGO! 24RCE
- SIPLUS LOGO! 24RCEo
⚠️ 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
Time manipulation could disrupt time-sensitive industrial processes, cause data logging errors, trigger false alarms, or interfere with scheduled operations, potentially leading to production downtime or safety issues.
Likely Case
Attackers change device time to disrupt operations, cause confusion in event logging, or interfere with time-based automation sequences.
If Mitigated
With proper network segmentation and access controls, impact is limited to potential logging inconsistencies without affecting core operations.
🎯 Exploit Status
Vulnerability allows unauthenticated time changes via network interaction. No authentication required makes exploitation straightforward.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: N/A
Vendor Advisory: https://cert-portal.siemens.com/productcert/html/ssa-267056.html
Restart Required: No
Instructions:
No firmware patch available. Follow vendor recommendations for network segmentation and access controls.
🔧 Temporary Workarounds
Network Segmentation
allIsolate LOGO! devices in dedicated network segments with strict firewall rules.
Access Control Lists
allImplement network ACLs to restrict access to LOGO! devices to authorized management systems only.
🧯 If You Can't Patch
- Implement strict network segmentation to isolate LOGO! devices from untrusted networks.
- Deploy industrial firewall with rules blocking unauthorized access to LOGO! management interfaces.
🔍 How to Verify
Check if Vulnerable:
Check device model numbers against affected list. If device is listed, it is vulnerable.Check Version:
Check device model number via LOGO! Soft Comfort software or physical device labeling.Verify Fix Applied:
Verify network segmentation and access controls prevent unauthorized access to device management interfaces.📡 Detection & Monitoring
Log Indicators:
- Unexpected time changes in device logs
- Unauthorized access attempts to device management interfaces
Network Indicators:
- Unauthorized network traffic to LOGO! device ports
- Time synchronization protocol anomalies
SIEM Query:
source="LOGO!*" AND (event="time_change" OR event="unauthorized_access")