CVE-2021-40363: Siemens SIMATIC Pcs 7

High severity, CVSS 7.8. EPSS: 0.2% chance of exploitation in the next 30 days.

A vulnerability has been identified in SIMATIC PCS 7 V8.2 (All versions), SIMATIC PCS 7 V9.0 (All versions), SIMATIC PCS 7 V9.1 (All versions < V9.1 SP1), SIMATIC WinCC V15 and earlier (All versions < V15 SP1 Update 7), SIMATIC WinCC V16 (All versions < V16 Update 5), SIMATIC WinCC V17 (All versions < V17 Update 2), SIMATIC WinCC V17 (All versions <= V17 Update 4), SIMATIC WinCC V7.4 (All versions < V7.4 SP1 Update 19), SIMATIC WinCC V7.5 (All versions < V7.5 SP2 Update 6). The affected component stores the credentials of a local system account in a potentially publicly accessible project file using an outdated cipher algorithm. An attacker may use this to brute force the credentials and take over the system.

Affected products

• Siemens SIMATIC Pcs 7: up to and including 8.2; version 9.0 only; version 9.1 only
• Siemens SIMATIC Wincc: before 7.4 (fixed in 7.4); version 7.4 only; version 7.5 only; version 13 only; version 14.0.1 only; version 15 only; …

Published 2022-02-09. Last modified 2026-06-17.