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Multiple Local Privilege Escalation Vulnerabilities in SINEC NMS and User Management Component (UMC)

Plan Patch7.8SSA-311973Feb 10, 2026
Attack VectorLocal
Auth RequiredLow
ComplexityLow
User InteractionNone needed
Summary

Multiple privilege escalation vulnerabilities in Siemens SINEC NMS and User Management Component (UMC) allow a local user with standard privileges to load malicious DLL libraries that execute with elevated system rights. The vulnerability stems from unsafe DLL search order and loading mechanisms (CWE-427). SINEC NMS versions before 4.0 SP2 are affected, as are UMC versions before 2.15.2.1. Exploitation requires local system access but no elevated starting privileges. Siemens has released patches for UMC (v2.15.2.1) and SINEC NMS v4.0 SP2, but organizations running all other SINEC NMS versions have no vendor patch available.

What this means
What could happen
A user with local access to a system running SINEC NMS or UMC could load malicious code that runs with system-level privileges, allowing them to compromise the configuration database, authentication system, or gain control over network management functions that may affect connected industrial equipment.
Who's at risk
Network managers and IT staff at utilities and industrial facilities using Siemens SINEC NMS for network management and monitoring should evaluate their systems. UMC is a core component for user authentication and access control across Siemens management platforms. Organizations running older SINEC NMS versions that cannot be patched face ongoing risk from local users or service accounts with malicious intent.
How it could be exploited
An attacker with local user account access to a SINEC NMS or UMC server can exploit a DLL search order or loading vulnerability (CWE-427) to place a malicious DLL in a location where the application searches for libraries. When the application runs, it loads and executes the attacker's code with elevated privileges, bypassing normal access controls.
Prerequisites
  • Local user account on the SINEC NMS or UMC server
  • Write access to directories searched by the vulnerable application during startup or operation
  • Ability to place malicious DLL file before the legitimate library is loaded
requires local access onlyno authentication bypass needed once on systemaffects access control and authentication systemsSINEC NMS (all versions) has no fix available
Exploitability
Low exploit probability (EPSS 0.0%)
Affected products (3)
3 with fix
ProductAffected VersionsFix Status
SINEC NMSAll versions4.0 SP2
SINEC NMSAll versions < V4.0 SP24.0 SP2
User Management Component (UMC)< 2.15.2.12.15.2.1
Remediation & Mitigation
0/5
Do now
0/1
HARDENINGImplement directory permissions to prevent unprivileged users from writing to application directories or shared library paths
Schedule — requires maintenance window
0/3

Patching may require device reboot — plan for process interruption

SINEC NMS
HOTFIXUpdate SINEC NMS to version 4.0 SP2 or later
User Management Component (UMC)
HOTFIXUpdate User Management Component (UMC) to version 2.15.2.1 or later
All products
HARDENINGMonitor for unauthorized DLL files placed in application directories or system library search paths
Long-term hardening
0/1
SINEC NMS
HARDENINGRestrict local user account privileges on SINEC NMS and UMC servers to the minimum required for operation
View full Siemens ProductCERT advisory
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