OTPulse

Siemens SINEMA Remote Connect Server

MonitorCVSS 4.3ICS-CERT ICSA-25-345-06Dec 9, 2025
Siemens
Attack path
Attack VectorNetwork
Auth RequiredLow
ComplexityLow
User InteractionNone needed
Summary

SINEMA Remote Connect Server before version 3.2 SP4 contains improper access control vulnerabilities (CWE-732, CWE-863) that allow authenticated users to modify system configurations or permissions beyond their assigned role. The vulnerabilities affect file and object permissions, potentially enabling privilege escalation or unauthorized configuration changes. Siemens recommends updating to V3.2 SP4 or later.

What this means
What could happen
An authenticated user with limited privileges could modify system configurations or permissions in SINEMA Remote Connect Server, potentially disrupting secure remote access to critical control systems or altering audit trails.
Who's at risk
Water utilities and electric utilities using Siemens SINEMA Remote Connect Server to manage secure remote access for engineering and maintenance of control systems. This affects organizations that rely on SINEMA for VPN or secure tunneling to PLCs, RTUs, and other critical infrastructure devices.
How it could be exploited
An attacker with valid login credentials to the SINEMA Remote Connect Server administrative interface could exploit improper access controls (CWE-863) or file permissions (CWE-732) to modify system settings or access sensitive configuration data without proper authorization.
Prerequisites
  • Valid user account with login access to SINEMA Remote Connect Server
  • Network access to the server's administrative interface (typically port 443)
  • Affects versions before V3.2 SP4
affects access control mechanismsrequires valid credentialslow CVSS score but affects privileged accessno active exploitation reported
Exploitability
Unlikely to be exploited — EPSS score 0.0%
Affected products (1)
ProductAffected VersionsFix Status
SINEMA Remote Connect Server<V3.2 SP43.2 SP4
Remediation & Mitigation
0/3
Do now
0/1
WORKAROUNDRestrict network access to SINEMA Remote Connect Server administrative interface using firewall rules, allowing only trusted engineering workstations or VPN connections
Schedule — requires maintenance window
0/1

Patching may require device reboot — plan for process interruption

HOTFIXUpdate SINEMA Remote Connect Server to V3.2 SP4 or later
Long-term hardening
0/1
HARDENINGReview and restrict user account permissions in SINEMA Remote Connect Server to follow the principle of least privilege
View full CISA ICS-CERT advisory
API: /api/v1/advisories/9da5fdc1-c059-4c19-9f78-ceb56c2e8fd4

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