CVE-2020-15786: Siemens SIMATIC HMI Basic Panels 2nd Generation Firmware

Critical severity, CVSS 9.8. EPSS: 1.5% chance of exploitation in the next 30 days.

A vulnerability has been identified in SIMATIC HMI Basic Panels 2nd Generation (incl. SIPLUS variants) (All versions < V16), SIMATIC HMI Comfort Panels (incl. SIPLUS variants) (All versions <= V16), SIMATIC HMI Mobile Panels (All versions <= V16), SIMATIC HMI Unified Comfort Panels (All versions <= V16). Affected devices insufficiently block excessive authentication attempts. This could allow a remote attacker to discover user passwords and obtain access to the Sm@rt Server via a brute-force attack.

Affected products

• Siemens SIMATIC HMI Basic Panels 2nd Generation Firmware: up to and including 14
• Siemens SIMATIC HMI Comfort Panels Firmware: any version
• Siemens SIMATIC HMI Mobile Panels Firmware: any version
• Siemens SIMATIC HMI United Comfort Panels Firmware: any version

Published 2020-09-09. Last modified 2026-06-17.