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Siemens SINEMA Remote Connect Server

Monitor4.3ICS-CERT ICSA-25-345-06Dec 9, 2025
Attack VectorNetwork
Auth RequiredLow
ComplexityLow
User InteractionNone needed
Summary

SINEMA Remote Connect Server versions before 3.2 SP4 are affected by improper access control (CWE-863) and insecure file permissions (CWE-732). These vulnerabilities could allow an authenticated user to modify system configuration or access permissions without proper authorization. The vulnerabilities require valid user credentials to exploit.

What this means
What could happen
An authenticated user with low privileges could modify system configuration or functionality in SINEMA Remote Connect Server, potentially disrupting secure remote access to industrial control systems or allowing unauthorized changes to access policies.
Who's at risk
Water utilities, electric utilities, and other industrial facilities that use Siemens SINEMA Remote Connect Server for secure remote access to PLCs, RTUs, and other control devices. Affects organizations relying on this software for remote engineering and maintenance of critical infrastructure.
How it could be exploited
An attacker with valid credentials to SINEMA Remote Connect Server could exploit improper access controls (CWE-863) or insecure file permissions (CWE-732) to modify configuration settings or permissions without authorization. This requires network access to the server and valid authentication credentials.
Prerequisites
  • Network access to SINEMA Remote Connect Server
  • Valid user credentials (authenticated access required)
  • Access to the affected server interface or API
remotely exploitablerequires authenticationimproper access controlsinsecure permissionsaffects remote access to control systems
Exploitability
Low exploit probability (EPSS 0.0%)
Affected products (1)
ProductAffected VersionsFix Status
SINEMA Remote Connect Server<V3.2 SP43.2 SP4
Remediation & Mitigation
0/4
Do now
0/1
WORKAROUNDRestrict network access to SINEMA Remote Connect Server using firewalls; only allow connections from authorized engineering workstations
Schedule — requires maintenance window
0/2

Patching may require device reboot — plan for process interruption

HOTFIXUpdate SINEMA Remote Connect Server to version 3.2 SP4 or later
HARDENINGUse VPN for remote access to SINEMA Remote Connect Server instead of direct internet exposure; ensure VPN is regularly updated
Long-term hardening
0/1
HARDENINGImplement network segmentation to isolate SINEMA Remote Connect Server and connected control systems from business networks and the internet
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