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Siemens SINEMA Remote Connect Client

Act Now9.8ICS-CERT ICSA-25-072-10Mar 11, 2025
Attack VectorNetwork
Auth RequiredNone
ComplexityLow
User InteractionNone needed
Summary

SINEMA Remote Connect Client versions before 3.2 SP3 contain multiple vulnerabilities including integer overflow (CWE-190), unsafe buffer operations (CWE-121), and code injection (CWE-923) that allow unauthenticated remote code execution. An attacker can exploit these flaws to execute arbitrary commands on the client machine through network requests without requiring valid credentials or user interaction.

What this means
What could happen
An attacker with network access to SINEMA Remote Connect Client could execute arbitrary code remotely without authentication, potentially gaining control of the device and compromising access to critical industrial systems that this client is used to manage.
Who's at risk
Organizations using Siemens SINEMA Remote Connect Client for remote management of industrial control systems, particularly utilities, manufacturing, and process industries that rely on Siemens automation and SCADA systems. Any engineering workstation, HMI, or jump server running SINEMA Remote Connect Client in versions before 3.2 SP3 is at risk.
How it could be exploited
An attacker on the network reaches the SINEMA Remote Connect Client application (typically running on an engineering workstation or admin machine) without needing credentials, sends a specially crafted network request exploiting one of the buffer overflow, integer overflow, or code injection vulnerabilities, and gains code execution on that machine with the privileges of the running application.
Prerequisites
  • Network access to the device/workstation running SINEMA Remote Connect Client
  • The vulnerable version (<V3.2 SP3) installed and running
  • No authentication required for exploitation
remotely exploitableno authentication requiredlow complexity attackhigh EPSS score (11.1%)affects remote access to critical control systems
Exploitability
High exploit probability (EPSS 11.1%)
Affected products (1)
ProductAffected VersionsFix Status
SINEMA Remote Connect Client<V3.2 SP33.2 SP3
Remediation & Mitigation
0/4
Do now
0/1
WORKAROUNDImplement network-level access controls to restrict inbound connections to engineering workstations and admin machines running SINEMA Remote Connect Client; limit connections to only authorized IP addresses (firewall rules)
Schedule — requires maintenance window
0/1

Patching may require device reboot — plan for process interruption

HOTFIXUpdate SINEMA Remote Connect Client to version 3.2 SP3 or later
Long-term hardening
0/2
HARDENINGIsolate engineering and administrative networks from general IT and internet-facing networks using firewalls and air-gaps
HARDENINGRequire VPN access for all remote connections to systems using SINEMA Remote Connect Client
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