CVE-2021-22744: Schneider Electric Tcm 4351b Firmware

Low severity, CVSS 3.9. EPSS: 0.2% chance of exploitation in the next 30 days.

Improper Check for Unusual or Exceptional Conditions vulnerability exists in Triconex Model 3009 MP installed on Tricon V11.3.x systems that could cause module reset when TCM receives malformed TriStation packets while the write-protect keyswitch is in the program position. This CVE ID is unique from CVE-2021-22742, CVE-2021-22745, CVE-2021-22746, and CVE-2021-22747.

Affected products

• Schneider Electric Tcm 4351b Firmware: from 11.3.0, before 11.5.1 (fixed in 11.5.1); version 11.7.0 only
• Schneider Electric Triconex Model 3009 Mp Firmware: from 11.3.0, before 11.8.0 (fixed in 11.8.0)

Published 2021-05-26. Last modified 2026-06-17.