{"cve":"CVE-2020-7543","nvd":{"published":"2020-12-11T01:15:12.580","modified":"2026-06-17T03:24:58.670","status":"Modified","description":"A CWE-754: Improper Check for Unusual or Exceptional Conditions vulnerability exists in Modicon M580, Modicon M340, Legacy Controllers Modicon Quantum & Modicon Premium (see security notifications for affected versions), that could cause denial of service when a specially crafted Read Physical Memory request over Modbus is sent to the controller.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-754"],"references":["https://www.se.com/ww/en/download/document/SEVD-2020-343-08/","https://www.se.com/ww/en/download/document/SEVD-2020-343-08/"],"products":["schneider-electric:modicon_m340_bmxp341000_firmware","schneider-electric:modicon_m340_bmxp342000_firmware","schneider-electric:modicon_m340_bmxp3420102_firmware","schneider-electric:modicon_m340_bmxp3420102cl_firmware","schneider-electric:modicon_m340_bmxp342020_firmware","schneider-electric:modicon_m340_bmxp3420302_firmware","schneider-electric:modicon_m340_bmxp3420302cl_firmware","schneider-electric:modicon_m580_bmep581020_firmware","schneider-electric:modicon_m580_bmep582020_firmware","schneider-electric:modicon_m580_bmep582040_firmware","schneider-electric:modicon_m580_bmep583020_firmware","schneider-electric:modicon_m580_bmep583040_firmware","schneider-electric:modicon_m580_bmep584020_firmware","schneider-electric:modicon_m580_bmep584040_firmware","schneider-electric:modicon_m580_bmep585040_firmware","schneider-electric:modicon_m580_bmep586040_firmware"],"source":"nvd","synced_at":"2026-10-19T21:12:09.559580076+00:00"},"epss":{"cve":"CVE-2020-7543","score":0.01338,"percentile":0.71273,"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."]}