CVE-2025-40757
📋 TL;DR
This vulnerability allows attackers to download encrypted database files containing passwords from Siemens building automation controllers without authentication. Affected devices include Siemens APOGEE PXC and TALON TC series controllers running all versions when connected to networks.
💻 Affected Systems
- APOGEE PXC Series (BACnet)
- APOGEE PXC Series (P2 Ethernet)
- TALON TC Series (BACnet)
⚠️ 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
Attackers obtain encrypted password databases, potentially enabling credential cracking and subsequent lateral movement to compromise building automation systems, HVAC controls, or physical security systems.
Likely Case
Attackers download encrypted password files and attempt offline cracking, potentially gaining access to building management systems and sensitive operational data.
If Mitigated
With proper network segmentation and access controls, attackers cannot reach vulnerable devices, limiting exposure to isolated network segments.
🎯 Exploit Status
Exploitation requires network access to vulnerable devices but no authentication or special tools.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Contact Siemens for specific firmware updates
Vendor Advisory: https://cert-portal.siemens.com/productcert/html/ssa-916339.html
Restart Required: Yes
Instructions:
1. Contact Siemens support for firmware updates. 2. Download appropriate firmware for your controller model. 3. Apply firmware update following Siemens documentation. 4. Verify update completion and functionality.
🔧 Temporary Workarounds
Network Segmentation
allIsolate building automation controllers on separate VLANs with strict firewall rules
Access Control Lists
allImplement network ACLs to restrict access to BACnet and P2 Ethernet ports (typically 47808 for BACnet)
🧯 If You Can't Patch
- Implement strict network segmentation to isolate building automation systems from general corporate networks
- Deploy intrusion detection systems to monitor for unauthorized access attempts to controller ports
🔍 How to Verify
Check if Vulnerable:
Check if device models match affected products list and are accessible on network without authenticationCheck Version:
Consult Siemens documentation for device-specific version checking commandsVerify Fix Applied:
Verify firmware version against Siemens patched versions and test that database files are no longer accessible without authentication📡 Detection & Monitoring
Log Indicators:
- Unauthorized access attempts to controller IP addresses
- Unexpected file download activity from controller devices
Network Indicators:
- Unusual traffic to BACnet port 47808 or P2 Ethernet ports from unauthorized sources
- Database file transfers from controller IPs
SIEM Query:
source_ip NOT IN (authorized_ips) AND dest_port IN (47808, other_controller_ports)