CVE-2020-25242: Siemens SIMATIC Net CP 343-1 Advanced Firmware

High severity, CVSS 7.5. EPSS: 1.3% chance of exploitation in the next 30 days.

A vulnerability has been identified in SIMATIC NET CP 343-1 Advanced (incl. SIPLUS variants) (All versions), SIMATIC NET CP 343-1 Lean (incl. SIPLUS variants) (All versions), SIMATIC NET CP 343-1 Standard (incl. SIPLUS variants) (All versions). Specially crafted packets sent to TCP port 102 could cause a Denial-of-Service condition on the affected devices. A cold restart might be necessary in order to recover.

Affected products

• Siemens SIMATIC Net CP 343-1 Advanced Firmware: any version
• Siemens SIMATIC Net CP 343-1 Lean Firmware: any version
• Siemens SIMATIC Net CP 343-1 Standard Firmware: any version

Published 2021-05-12. Last modified 2026-06-17.