CVE-2021-42029: Siemens SIMATIC Step 7

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

A vulnerability has been identified in SIMATIC STEP 7 (TIA Portal) V15 (All versions), SIMATIC STEP 7 (TIA Portal) V16 (All versions < V16 Update 5), SIMATIC STEP 7 (TIA Portal) V17 (All versions < V17 Update 2). An attacker could achieve privilege escalation on the web server of certain devices due to improper access control vulnerability in the engineering system software. The attacker needs to have direct access to the impacted web server.

Affected products

• Siemens SIMATIC Step 7: from 15, before 16 (fixed in 16); version 16 only; version 17 only

Published 2022-04-12. Last modified 2026-06-17.