{"cve":"CVE-2021-22747","nvd":{"published":"2021-05-26T20:15:09.457","modified":"2026-06-17T03:37:42.070","status":"Modified","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-2021-22746.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:P/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H","score":3.9},"cwes":["CWE-754"],"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"],"products":["schneider-electric:tcm_4351b_firmware","schneider-electric:triconex_model_3009_mp_firmware"],"source":"nvd","synced_at":"2026-10-19T21:18:09.669877188+00:00"},"epss":{"cve":"CVE-2021-22747","score":0.00246,"percentile":0.15868,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}