CVE-2021-22746

Severity: low (CVSS 3.9 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-05-26 · updated 2026-06-17
Weakness: CWE-754

Description

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-2021-22744, CVE-2021-22745, and CVE-2021-22747.

Affected products

Schneider-Electric Tcm 4351B Firmware: from 11.3.0 before 11.5.1; 11.7.0 — fixed in 11.5.1
Schneider-Electric Triconex Model 3009 Mp Firmware: from 11.3.0 before 11.8.0 — fixed in 11.8.0

How to fix

Upgrade to a fixed version: Schneider-Electric Tcm 4351B Firmware 11.5.1; Schneider-Electric Triconex Model 3009 Mp Firmware 11.8.0. Check the vendor advisory for mitigations.

References

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