CVE-2023-50821: Siemens SIMATIC Pcs 7 v9.1

Medium severity, CVSS 6.2. EPSS: 0.2% chance of exploitation in the next 30 days.

A vulnerability has been identified in SIMATIC PCS 7 V9.1 (All versions < V9.1 SP2 UC04), SIMATIC WinCC Runtime Professional V17 (All versions < V17 Update 8), SIMATIC WinCC Runtime Professional V18 (All versions < V18 Update 4), SIMATIC WinCC Runtime Professional V19 (All versions < V19 Update 1), SIMATIC WinCC V7.5 (All versions < V7.5 SP2 Update 16), SIMATIC WinCC V8.0 (All versions < V8.0 Update 5). The affected products do not properly validate the input provided in the login dialog box. An attacker could leverage this vulnerability to cause a persistent denial of service condition.

Affected products

• Siemens SIMATIC Pcs 7 v9.1: before V9.1 SP2 UC04 (fixed in V9.1 SP2 UC04)
• Siemens SIMATIC Wincc Runtime Professional v17: before V17 Update 8 (fixed in V17 Update 8)
• Siemens SIMATIC Wincc Runtime Professional v18: before V18 Update 4 (fixed in V18 Update 4)
• Siemens SIMATIC Wincc Runtime Professional v19: before V19 Update 1 (fixed in V19 Update 1)
• Siemens SIMATIC Wincc v7.5
• Siemens SIMATIC Wincc v8.0: before V8.0 Update 5 (fixed in V8.0 Update 5)

Published 2024-04-09. Last modified 2026-06-17.