CVE-2025-40815
📋 TL;DR
A buffer overflow vulnerability in Siemens LOGO! programmable logic controllers allows attackers to execute arbitrary code by sending specially crafted TCP packets. This affects all versions of multiple LOGO! and SIPLUS LOGO! device models. Successful exploitation could give attackers full control of affected industrial control systems.
💻 Affected Systems
- LOGO! 12/24RCE (6ED1052-1MD08-0BA2)
- LOGO! 12/24RCEo (6ED1052-2MD08-0BA2)
- LOGO! 230RCE (6ED1052-1FB08-0BA2)
- LOGO! 230RCEo (6ED1052-2FB08-0BA2)
- LOGO! 24CE (6ED1052-1CC08-0BA2)
- LOGO! 24CEo (6ED1052-2CC08-0BA2)
- LOGO! 24RCE (6ED1052-1HB08-0BA2)
- LOGO! 24RCEo (6ED1052-2HB08-0BA2)
- SIPLUS LOGO! 12/24RCE (6AG1052-1MD08-7BA2)
- SIPLUS LOGO! 12/24RCEo (6AG1052-2MD08-7BA2)
- SIPLUS LOGO! 230RCE (6AG1052-1FB08-7BA2)
- SIPLUS LOGO! 230RCEo (6AG1052-2FB08-7BA2)
- SIPLUS LOGO! 24CE (6AG1052-1CC08-7BA2)
- SIPLUS LOGO! 24CEo (6AG1052-2CC08-7BA2)
- SIPLUS LOGO! 24RCE (6AG1052-1HB08-7BA2)
- SIPLUS LOGO! 24RCEo (6AG1052-2HB08-7BA2)
⚠️ 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 compromise of industrial control systems leading to physical process disruption, equipment damage, or safety incidents
Likely Case
Remote code execution allowing attackers to manipulate PLC logic, disrupt operations, or establish persistence in industrial networks
If Mitigated
Limited impact if devices are isolated behind firewalls with strict network segmentation and access controls
🎯 Exploit Status
Exploitation requires crafting malicious TCP packets but does not require authentication. No public exploit code is currently available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: https://cert-portal.siemens.com/productcert/html/ssa-267056.html
Restart Required: No
Instructions:
No firmware patch is currently available. Follow vendor advisory for mitigation guidance and monitor for future updates.
🔧 Temporary Workarounds
Network segmentation and firewall rules
allRestrict network access to LOGO! devices using firewalls and network segmentation
Disable unnecessary network services
allDisable any unused network protocols and services on LOGO! devices
🧯 If You Can't Patch
- Isolate LOGO! devices in dedicated network segments with strict firewall rules
- Implement network monitoring and intrusion detection for anomalous TCP traffic to LOGO! devices
🔍 How to Verify
Check if Vulnerable:
Check device model numbers against affected products list. All versions of listed models are vulnerable.Check Version:
Check device model number printed on the device or via LOGO! Soft Comfort softwareVerify Fix Applied:
Monitor vendor advisory for patch availability. No current fix exists to verify.📡 Detection & Monitoring
Log Indicators:
- Unusual TCP connection attempts to LOGO! devices
- Multiple malformed TCP packets to PLC ports
- Device restart or abnormal behavior logs
Network Indicators:
- Anomalous TCP traffic patterns to LOGO! devices (typically port 102 for S7 communication)
- Multiple TCP packets with unusual structure or size
SIEM Query:
source_ip="*" AND dest_port="102" AND protocol="TCP" AND (packet_size>normal_range OR packet_structure_anomaly=true)