CVE-2020-7566: Schneider Electric Modicon m221 Firmware

High severity, CVSS 7.3. EPSS: 0.3% chance of exploitation in the next 30 days.

A CWE-334: Small Space of Random Values vulnerability exists in Modicon M221 (all references, all versions) that could allow the attacker to break the encryption keys when the attacker has captured the traffic between EcoStruxure Machine - Basic software and Modicon M221 controller.

Affected products

• Schneider Electric Modicon m221 Firmware: affected versions not specified

Published 2020-11-19. Last modified 2026-06-17.