CVE intelligence and bounded remediation

CVE-2017-6871 — Siemens Simatic Wincc Sm@Rtclient security vulnerability

Medium CVSS 5.4

A vulnerability was discovered in Siemens SIMATIC WinCC Sm@rtClient for Android (All versions before V1.0.2.2) and SIMATIC WinCC Sm@rtClient for Android Lite (All versions before V1.0.2.2). An attacker with physical access to an unlocked mobile device, that has the affected app running, could bypass the app's authentication mechanism under certain conditions.

Severity
Medium
CVSS
5.4 (3.0)
Published
2017-08-08
CISA KEV
Not currently listed
Ecosystem
software/application
Weaknesses
CWE-288, CWE-287

Affected products

  • siemens / simatic_wincc_sm@rtclient
  • siemens / simatic_wincc_sm@rtclient_lite

Matched remediation archetype

Authentication bypass and missing authentication

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Check exposure

  • Map every affected endpoint and protocol path, including alternate ports, legacy routes, recovery flows, service accounts, and machine-to-machine access.
  • Confirm which deployments enable the affected authentication mode and whether the interface is reachable from untrusted networks.
  • Review session, token, credential, and proxy trust configuration without attempting account takeover.

Remediate safely

  • Apply the supported fix and centralize fail-closed authentication before protected request handling.
  • Remove default or embedded credentials, rotate affected secrets and sessions, and bind authentication decisions to the intended audience and channel.
  • Add negative tests for alternate routes, malformed or absent credentials, recovery flows, and proxy-derived identity.

Authoritative sources

Complete CVE record and remediation plan

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