CVE-2020-15783: Siemens SIMATIC s7-300 CPU 312 Firmware

High severity, CVSS 7.5. EPSS: 1.7% chance of exploitation in the next 30 days.

A vulnerability has been identified in SIMATIC S7-300 CPU family (incl. related ET200 CPUs and SIPLUS variants) (All versions), SIMATIC TDC CPU555 (All versions), SINUMERIK 840D sl (All versions). Sending multiple specially crafted packets to the affected devices could cause a Denial-of-Service on port 102. A cold restart is required to recover the service.

Affected products

• Siemens SIMATIC s7-300 CPU 312 Firmware: any version
• Siemens SIMATIC s7-300 CPU 314 Firmware: any version
• Siemens SIMATIC s7-300 CPU 315-2 Dp Firmware: any version
• Siemens SIMATIC s7-300 CPU 315-2 Pn Firmware: any version
• Siemens SIMATIC s7-300 CPU 315f-2 Dp Firmware: any version
• Siemens SIMATIC s7-300 CPU 315f-2 Pn Firmware: any version
• Siemens SIMATIC s7-300 CPU 317-2 Dp Firmware: any version
• Siemens SIMATIC s7-300 CPU 317-2 Pn Firmware: any version
• Siemens SIMATIC s7-300 CPU 317f-2 Dp Firmware: any version
• Siemens SIMATIC s7-300 CPU 317f-2 Pn Firmware: any version
• Siemens SIMATIC Tdc CPU555 Firmware: any version
• Siemens Sinumerik 840d Sl Firmware: any version

Published 2020-11-12. Last modified 2026-06-17.