CVE-2020-7566

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.

Score

CVSS 3.1 7.3 High

Status

Modified - cybersecurity@se.com

Published

2020-11-19

Last modified

2026-05-29

Weaknesses

CWE-334

Affected products

• Modicon M221 Firmware (Schneider-electric)

References

• https://us-cert.cisa.gov/ics/advisories/icsa-20-343-04
• https://www.se.com/ww/en/download/document/SEVD-2020-315-05/