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Siemens SCALANCE

Act Now9.8ICS-CERT ICSA-21-287-07Oct 12, 2021
Attack VectorNetwork
Auth RequiredNone
ComplexityLow
User InteractionNone needed
Summary

The SCALANCE W1750D contains multiple command injection and buffer overflow vulnerabilities (CWE-352, CWE-120, CWE-77, CWE-22, CWE-311) that allow remote code execution or denial of service without authentication. Affected versions include all versions prior to 8.7.1.3, versions 8.7.1.3 through 8.7.1.8, and version 8.7.1.9 and later (for which no fix is planned). An attacker can inject commands or trigger buffer overflows to execute arbitrary code or crash the device. Siemens recommends upgrading to patched versions where available and implementing network access controls as mitigations.

What this means
What could happen
An attacker with network access to the SCALANCE W1750D could execute arbitrary commands or crash the device, potentially disrupting wireless network connectivity to field devices and control systems. Versions 8.7.1.9 and later have no patch available.
Who's at risk
Water and utility operators using Siemens SCALANCE W1750D wireless access points or controllers for field device communication. This includes facilities managing remote sensors, RTUs, PLCs, or SCADA systems that rely on wireless connectivity through these devices.
How it could be exploited
An attacker on the network sends crafted packets or injects commands through the management interface to trigger command injection or buffer overflow conditions. This bypasses authentication and allows remote code execution or denial of service without requiring credentials.
Prerequisites
  • Network access to the SCALANCE W1750D device or its management interface
  • Device must be reachable from the attacker's network segment
Remotely exploitable without authenticationLow attack complexityHigh CVSS score (9.8)No patch available for versions 8.7.1.9+Affects wireless network infrastructure critical to operations
Exploitability
Moderate exploit probability (EPSS 3.6%)
Affected products (3)
2 with fix1 pending
ProductAffected VersionsFix Status
SCALANCE W1750D<V8.7.1.38.7.1.3
SCALANCE W1750D≥ 8.7.1.9No fix yet
SCALANCE W1750D≥ V8.7.1.3 <V8.7.1.98.7.1.9
Remediation & Mitigation
0/7
Do now
0/1
SCALANCE W1750D
WORKAROUNDFor SCALANCE W1750D version 8.7.1.9 and later (no fix available): Block network access to the device management interface (CLI and web-based) from untrusted users and networks
Schedule — requires maintenance window
0/2

Patching may require device reboot — plan for process interruption

SCALANCE W1750D
HOTFIXUpdate SCALANCE W1750D versions <8.7.1.3 to version 8.7.1.3
HOTFIXUpdate SCALANCE W1750D versions 8.7.1.3 to 8.7.1.8 to version 8.7.1.9 or later
Long-term hardening
0/4
HARDENINGRestrict communication between controllers/gateways and access points to a dedicated VLAN or Layer 2 segment, or use firewall policies to limit authorized device communication
HARDENINGEnable Enhanced PAPI Security feature where available to prevent exploitation
HARDENINGConfigure access control lists (ACLs) to restrict unauthorized access to RAPConsole or Local Debug interfaces
HARDENINGEnsure the device operates in a protected IT environment behind a firewall, isolated from the business network and the Internet
View full CISA ICS-CERT advisory
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