CVE-2025-40568
📋 TL;DR
This vulnerability allows authenticated remote attackers with 'guest' role privileges to terminate legitimate user sessions in affected Siemens industrial network devices. It affects multiple RUGGEDCOM and SCALANCE product lines running versions below V3.2. The flaw stems from an incorrect authorization check in the web interface's session termination functionality.
💻 Affected Systems
- RUGGEDCOM RST2428P (6GK6242-6PA00)
- SCALANCE XCH328 (6GK5328-4TS01-2EC2)
- SCALANCE XCM324 (6GK5324-8TS01-2AC2)
- SCALANCE XCM328 (6GK5328-4TS01-2AC2)
- SCALANCE XCM332 (6GK5332-0GA01-2AC2)
- SCALANCE XRH334 (24 V DC, 8xFO, CC) (6GK5334-2TS01-2ER3)
- SCALANCE XRM334 (230 V AC, 12xFO) (6GK5334-3TS01-3AR3)
- SCALANCE XRM334 (230 V AC, 8xFO) (6GK5334-2TS01-3AR3)
- SCALANCE XRM334 (230V AC, 2x10G, 24xSFP, 8xSFP+) (6GK5334-5TS01-3AR3)
- SCALANCE XRM334 (24 V DC, 12xFO) (6GK5334-3TS01-2AR3)
- SCALANCE XRM334 (24 V DC, 8xFO) (6GK5334-2TS01-2AR3)
- SCALANCE XRM334 (24V DC, 2x10G, 24xSFP, 8xSFP+) (6GK5334-5TS01-2AR3)
- SCALANCE XRM334 (2x230 V AC, 12xFO) (6GK5334-3TS01-4AR3)
- SCALANCE XRM334 (2x230 V AC, 8xFO) (6GK5334-2TS01-4AR3)
- SCALANCE XRM334 (2x230V AC, 2x10G, 24xSFP, 8xSFP+) (6GK5334-5TS01-4AR3)
⚠️ 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
An attacker could disrupt operations by terminating administrator sessions during critical maintenance or configuration changes, potentially causing service interruptions in industrial environments.
Likely Case
Guest users could disrupt other users' sessions, causing temporary access issues and requiring re-authentication, but without direct data compromise or system takeover.
If Mitigated
With proper network segmentation and role-based access controls, impact is limited to minor service disruptions requiring user re-authentication.
🎯 Exploit Status
Exploitation requires authenticated access with guest role privileges. The vulnerability is in the web interface's authorization logic.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: V3.2 or later
Vendor Advisory: https://cert-portal.siemens.com/productcert/html/ssa-693776.html
Restart Required: Yes
Instructions:
1. Download firmware V3.2 or later from Siemens support portal. 2. Backup current configuration. 3. Upload and install new firmware via web interface or management tools. 4. Reboot device. 5. Restore configuration if needed. 6. Verify version is V3.2 or higher.
🔧 Temporary Workarounds
Restrict Guest Access
allRemove or restrict guest account access to web interface
Configure via web interface: System > User Management > Modify guest role permissions
Network Segmentation
allIsolate affected devices from untrusted networks and limit access to authorized users only
🧯 If You Can't Patch
- Implement strict network access controls to limit web interface access to trusted users only
- Disable or remove guest accounts entirely from affected devices
🔍 How to Verify
Check if Vulnerable:
Check firmware version via web interface: System > Device Information > Firmware Version. If version is below V3.2, device is vulnerable.Check Version:
Web interface: System > Device Information > Firmware Version fieldVerify Fix Applied:
After patching, verify firmware version is V3.2 or higher in System > Device Information. Test with guest account that session termination functionality now properly validates authorization.📡 Detection & Monitoring
Log Indicators:
- Multiple session termination events from guest accounts
- Users reporting unexpected session timeouts or forced logouts
Network Indicators:
- HTTP POST requests to session termination endpoints from guest accounts
- Unusual session management traffic patterns
SIEM Query:
source="industrial_switch" AND (event_type="session_termination" AND user_role="guest")