CVE-2021-27395: Siemens SIMATIC Process Historian 2013

High severity, CVSS 8.1. EPSS: 0.8% chance of exploitation in the next 30 days.

A vulnerability has been identified in SIMATIC Process Historian 2013 and earlier (All versions), SIMATIC Process Historian 2014 (All versions < SP3 Update 6), SIMATIC Process Historian 2019 (All versions), SIMATIC Process Historian 2020 (All versions). An interface in the software that is used for critical functionalities lacks authentication, which could allow a malicious user to maliciously insert, modify or delete data.

Affected products

• Siemens SIMATIC Process Historian 2013: any version
• Siemens SIMATIC Process Historian 2014: affected versions not specified
• Siemens SIMATIC Process Historian 2019: any version
• Siemens SIMATIC Process Historian 2020: any version

Published 2021-10-12. Last modified 2026-06-17.