CVE-2025-40755
📋 TL;DR
This SQL injection vulnerability in SINEC NMS allows authenticated low-privileged attackers to insert malicious data and escalate privileges. It affects all SINEC NMS versions before V4.0 SP1. Attackers could gain administrative access to the network management system.
💻 Affected Systems
- SINEC NMS
📦 What is this software?
Sinec Nms by Siemens
Sinec Nms by Siemens
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with administrative access, data exfiltration, and lateral movement to connected industrial control systems.
Likely Case
Privilege escalation to admin level within SINEC NMS, allowing configuration changes and access to sensitive network data.
If Mitigated
Limited impact if proper network segmentation and least privilege access controls are implemented.
🎯 Exploit Status
SQL injection vulnerabilities are commonly weaponized. Requires authenticated access but low privileges are sufficient.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: V4.0 SP1 or later
Vendor Advisory: https://cert-portal.siemens.com/productcert/html/ssa-318832.html
Restart Required: Yes
Instructions:
1. Download SINEC NMS V4.0 SP1 or later from Siemens support portal. 2. Backup current configuration. 3. Install the update following Siemens documentation. 4. Restart the SINEC NMS service.
🔧 Temporary Workarounds
Network Segmentation
allRestrict access to SINEC NMS to only trusted administrative networks
WAF Rules
allImplement web application firewall rules to block SQL injection patterns
🧯 If You Can't Patch
- Implement strict network access controls to limit SINEC NMS exposure
- Apply principle of least privilege and monitor for unusual authentication patterns
🔍 How to Verify
Check if Vulnerable:
Check SINEC NMS version in web interface or via system information. Versions below V4.0 SP1 are vulnerable.Check Version:
Check web interface or consult Siemens documentation for version verification commands.Verify Fix Applied:
Verify version is V4.0 SP1 or later in system information and test that getTotalAndFilterCounts endpoint properly sanitizes input.📡 Detection & Monitoring
Log Indicators:
- Unusual SQL queries in application logs
- Multiple failed authentication attempts followed by successful low-privilege login
- Unexpected privilege escalation events
Network Indicators:
- Unusual database queries from SINEC NMS application server
- Traffic patterns indicating SQL injection attempts
SIEM Query:
source="sinec_nms" AND (message="*getTotalAndFilterCounts*" OR message="*SQL*" OR message="*privilege*escalation*")