CVE-2018-7789: Schneider Electric Modicon m221 Firmware

High severity, CVSS 7.5. EPSS: 2.8% chance of exploitation in the next 30 days.

An Improper Check for Unusual or Exceptional Conditions vulnerability exists in Schneider Electric's Modicon M221 product (all references, all versions prior to firmware V1.6.2.0). The vulnerability allows unauthorized users to remotely reboot Modicon M221 using crafted programing protocol frames.

Affected products

Published 2018-08-29. Last modified 2026-06-17.