Siemens SINEC NMS
Act Now9.8ICS-CERT ICSA-25-191-01Jul 8, 2025
Attack VectorNetwork
Auth RequiredNone
ComplexityLow
User InteractionNone needed
Summary
Siemens SINEC NMS before V4.0 is affected by multiple vulnerabilities including SQL injection (CWE-89), missing authentication checks (CWE-306), and path traversal (CWE-22) that could allow privilege escalation and arbitrary code execution on the network management system.
What this means
What could happen
An attacker could gain administrative control of your SINEC NMS system, allowing them to modify network management settings, access sensitive network configuration data, or execute commands that could affect how your industrial network is monitored and controlled.
Who's at risk
This affects water utilities and electric utilities that use Siemens SINEC NMS for network management and monitoring of industrial control systems. Network administrators responsible for ICS visibility and management should prioritize this update, as SINEC NMS is typically a critical access point for managing industrial devices across your network.
How it could be exploited
An attacker on the network can send malicious requests to the SINEC NMS system without credentials. The SQL injection vulnerability allows database manipulation, the missing authentication checks allow unauthorized access, and the path traversal allows access to protected files. Combined, these could lead to administrative privilege escalation and arbitrary code execution on the NMS system.
Prerequisites
- Network access to SINEC NMS web interface or API
- SINEC NMS version prior to V4.0
- No authentication required for exploitation
remotely exploitableno authentication requiredlow complexityhigh CVSS score (9.8)affects network management and visibility systems
Exploitability
Low exploit probability (EPSS 0.4%)
Affected products (1)
ProductAffected VersionsFix Status
SINEC NMS< V4.04.0
Remediation & Mitigation
0/4
Do now
0/2WORKAROUNDRestrict network access to SINEC NMS using firewall rules and access controls; ensure the system is not reachable directly from the Internet
HARDENINGIsolate SINEC NMS on a protected management network separate from operational networks and business networks
Schedule — requires maintenance window
0/1Patching may require device reboot — plan for process interruption
HOTFIXUpdate SINEC NMS to version 4.0 or later
Long-term hardening
0/1HARDENINGUse VPN or other secure remote access methods if remote management of SINEC NMS is required; keep VPN and all connected systems fully patched
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