CVE-2020-15791: Siemens SIMATIC s7-300 CPU 312 Firmware

Medium severity, CVSS 6.5. EPSS: 0.7% 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 S7-400 CPU family (incl. SIPLUS variants) (All versions), SIMATIC WinAC RTX (F) 2010 (All versions), SINUMERIK 840D sl (All versions). The authentication protocol between a client and a PLC via port 102/tcp (ISO-TSAP) insufficiently protects the transmitted password. This could allow an attacker that is able to intercept the network traffic to obtain valid PLC credentials.

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 s7-400 CPU 412 Firmware: any version
• Siemens SIMATIC s7-400 CPU 414 Firmware: any version
• Siemens SIMATIC s7-400 CPU 416 Firmware: any version
• Siemens SIMATIC s7-400 CPU 417 Firmware: any version

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