CVE-2018-7821: Schneider Electric Modicon m221 Firmware

High severity, CVSS 7.5. EPSS: 1.1% chance of exploitation in the next 30 days.

An Environment (CWE-2) vulnerability exists in SoMachine Basic, all versions, and Modicon M221(all references, all versions prior to firmware V1.10.0.0) which could cause cycle time impact when flooding the M221 ethernet interface while the Ethernet/IP adapter is activated.

Affected products

• Schneider Electric Modicon m221 Firmware: before 1.10.0.0 (fixed in 1.10.0.0)
• Schneider Electric Somachine Basic: any version

Published 2019-05-22. Last modified 2026-06-17.