CVE-2016-9158: Siemens SIMATIC s7-300 CPU Firmware

High severity, CVSS 7.5. EPSS: 3% chance of exploitation in the next 30 days.

A vulnerability has been identified in SIMATIC S7-300 CPU family (All versions), SIMATIC S7-300 CPU family (incl. related ET200 CPUs and SIPLUS variants) (All versions), SIMATIC S7-400 PN/DP V6 and below CPU family (incl. SIPLUS variants) (All versions), SIMATIC S7-400 PN/DP V7 CPU family (incl. SIPLUS variants) (All versions), SIMATIC S7-400 V6 and earlier CPU family (All versions), SIMATIC S7-400 V7 CPU family (All versions). Specially crafted packets sent to port 80/tcp could cause the affected devices to go into defect mode. A cold restart is required to recover the system.

Affected products

• Siemens SIMATIC s7-300 CPU Firmware: affected versions not specified
• Siemens SIMATIC s7-400 CPU Firmware: affected versions not specified

Published 2016-12-17. Last modified 2026-06-17.