What’s Vulnerable › Vulnerabilities

CVE-2021-22742

• 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.

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

• https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2021-130-03
• https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2021-130-03

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