CVE-2023-50821

Severity: medium (CVSS 6.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-04-09 · updated 2026-06-17
Weakness: CWE-120

Description

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: before V7.5 SP2 Update 16 — fixed in V7.5 SP2 Update 16
Siemens SIMATIC WinCC V8.0: before V8.0 Update 5 — fixed in V8.0 Update 5

How to fix

Upgrade to a fixed version: Siemens SIMATIC PCS 7 V9.1 V9.1 SP2 UC04; Siemens SIMATIC WinCC Runtime Professional V17 V17 Update 8; Siemens SIMATIC WinCC Runtime Professional V18 V18 Update 4; Siemens SIMATIC WinCC Runtime Professional V19 V19 Update 1; Siemens SIMATIC WinCC V7.5 V7.5 SP2 Update 16; Siemens SIMATIC WinCC V8.0 V8.0 Update 5. Check the vendor advisory for mitigations.

References

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