CVE-2017-2684: Siemens SIMATIC Logon

Critical severity, CVSS 9.0. EPSS: 2% chance of exploitation in the next 30 days.

Siemens SIMATIC Logon prior to V1.5 SP3 Update 2 could allow an attacker with knowledge of a valid user name, and physical or network access to the affected system, to bypass the application-level authentication.

Affected products

• Siemens SIMATIC Logon: up to and including 1.5

Published 2017-02-22. Last modified 2026-06-17.