CVE-2025-40583
📋 TL;DR
SCALANCE LPE9403 devices with SINEMA Remote Connect Edge Client transmit sensitive information in cleartext, allowing privileged local attackers to intercept this data. This affects all versions of the specified hardware with the vulnerable client installed.
💻 Affected Systems
- SCALANCE LPE9403 (6GK5998-3GS00-2AC2)
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Privileged local attacker obtains sensitive configuration data, credentials, or network information that could facilitate further attacks on industrial control systems.
Likely Case
Authorized local user with administrative access captures transmitted sensitive data, potentially compromising device security or network integrity.
If Mitigated
With proper network segmentation and access controls, impact is limited to isolated systems with minimal exposure.
🎯 Exploit Status
Exploitation requires local privileged access to intercept cleartext transmissions.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Siemens advisory for specific patched versions
Vendor Advisory: https://cert-portal.siemens.com/productcert/html/ssa-327438.html
Restart Required: Yes
Instructions:
1. Review Siemens advisory SSA-327438. 2. Apply recommended updates to SINEMA Remote Connect Edge Client. 3. Restart affected devices. 4. Verify encryption is properly implemented.
🔧 Temporary Workarounds
Network Segmentation
allIsolate affected devices to limit exposure to privileged local attackers
Access Control Hardening
allRestrict local administrative access to only essential personnel
🧯 If You Can't Patch
- Implement network monitoring for cleartext transmissions from affected devices
- Deploy additional authentication controls and audit privileged local access
🔍 How to Verify
Check if Vulnerable:
Check if SCALANCE LPE9403 (6GK5998-3GS00-2AC2) has SINEMA Remote Connect Edge Client installed via device management interfaceCheck Version:
Check via SINEMA Remote Connect management interface or device consoleVerify Fix Applied:
Verify SINEMA Remote Connect Edge Client version matches patched version from Siemens advisory and monitor for encrypted transmissions📡 Detection & Monitoring
Log Indicators:
- Unusual local privileged access attempts
- Cleartext data transmission logs
Network Indicators:
- Cleartext protocol traffic from SCALANCE devices on internal networks
SIEM Query:
source_ip:SCALANCE_DEVICE AND protocol:unencrypted AND (data_length > threshold)