CVE-2022-40227: Siemens SIMATIC HMI Comfort Panels Firmware

High severity, CVSS 7.5. EPSS: 0.9% chance of exploitation in the next 30 days.

A vulnerability has been identified in SIMATIC HMI Comfort Panels (incl. SIPLUS variants) (All versions < V17 Update 4), SIMATIC HMI KTP Mobile Panels (All versions < V17 Update 4), SIMATIC HMI KTP1200 Basic (All versions < V17 Update 5), SIMATIC HMI KTP400 Basic (All versions < V17 Update 5), SIMATIC HMI KTP700 Basic (All versions < V17 Update 5), SIMATIC HMI KTP900 Basic (All versions < V17 Update 5), SIPLUS HMI KTP1200 BASIC (All versions < V17 Update 5), SIPLUS HMI KTP400 BASIC (All versions < V17 Update 5), SIPLUS HMI KTP700 BASIC (All versions < V17 Update 5), SIPLUS HMI KTP900 BASIC (All versions < V17 Update 5). Affected devices do not properly validate input sent to certain services over TCP. This could allow an unauthenticated remote attacker to cause a permanent denial of service condition (requiring a device reboot) by sending specially crafted TCP packets.

Affected products

• Siemens SIMATIC HMI Comfort Panels Firmware: before 17.0 (fixed in 17.0); version 17.0 only
• Siemens SIMATIC HMI KTP1200 Basic Firmware: before 17.0 (fixed in 17.0); version 17.0 only
• Siemens SIMATIC HMI KTP400 Basic Firmware: before 17.0 (fixed in 17.0); version 17.0 only
• Siemens SIMATIC HMI KTP700 Basic Firmware: before 17.0 (fixed in 17.0); version 17.0 only
• Siemens SIMATIC HMI KTP900 Basic Firmware: before 17.0 (fixed in 17.0); version 17.0 only
• Siemens SIMATIC HMI Ktp Mobile Panels Firmware: before 17.0 (fixed in 17.0); version 17.0 only
• Siemens Siplus HMI KTP1200 Basic Firmware: before 17.0 (fixed in 17.0); version 17.0 only
• Siemens Siplus HMI KTP400 Basic Firmware: before 17.0 (fixed in 17.0); version 17.0 only
• Siemens Siplus HMI KTP700 Basic Firmware: before 17.0 (fixed in 17.0); version 17.0 only
• Siemens Siplus HMI KTP900 Basic Firmware: before 17.0 (fixed in 17.0); version 17.0 only

Published 2022-10-11. Last modified 2026-06-17.