{"id":"CVE-2019-6856","aliases":["EUVD-2019-16410","GHSA-xhgj-59fx-f85c"],"status":"published","title":"A CWE-754: Improper Check for Unusual or Exceptional Conditions vulnerability exists in Modicon...","description":"A CWE-754: Improper Check for Unusual or Exceptional Conditions vulnerability exists in Modicon M580, Modicon M340, Modicon Quantum, Modicon Premium (see security notification for specific versions) which could cause a Denial of Service when writing specific physical memory blocks using Modbus TCP.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.0163,"percentile":0.76382,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-754"],"published":"2020-01-06T22:57:02Z","modified":"2026-06-17T02:39:48Z","products":[{"vendor":"schneider electric se","product":"modicon m580, modicon m340, modicon quantum,  modicon premium (see security notification for specific versions)"},{"vendor":"schneider-electric","product":"140cpu65150_firmware"},{"vendor":"schneider-electric","product":"140cpu65160_firmware"},{"vendor":"schneider-electric","product":"140cpu65160s_firmware"},{"vendor":"schneider-electric","product":"140cpu65260_firmware"},{"vendor":"schneider-electric","product":"140cpu65860_firmware"},{"vendor":"schneider-electric","product":"140cpu67060_firmware"},{"vendor":"schneider-electric","product":"140cpu67160_firmware"},{"vendor":"schneider-electric","product":"140cpu67160s_firmware"},{"vendor":"schneider-electric","product":"140cpu67260_firmware"},{"vendor":"schneider-electric","product":"140cpu67261_firmware"},{"vendor":"schneider-electric","product":"140cpu67861_firmware"},{"vendor":"schneider-electric","product":"modicon_m340_firmware"},{"vendor":"schneider-electric","product":"modicon_m580_firmware"},{"vendor":"schneider-electric","product":"tsxh5724m_firmware"},{"vendor":"schneider-electric","product":"tsxh5744m_firmware"},{"vendor":"schneider-electric","product":"tsxp57104m_firmware"},{"vendor":"schneider-electric","product":"tsxp57154m_firmware"},{"vendor":"schneider-electric","product":"tsxp571634m_firmware"},{"vendor":"schneider-electric","product":"tsxp57204m_firmware"},{"vendor":"schneider-electric","product":"tsxp57254m_firmware"},{"vendor":"schneider-electric","product":"tsxp572634m_firmware"},{"vendor":"schneider-electric","product":"tsxp57304m_firmware"},{"vendor":"schneider-electric","product":"tsxp57354m_firmware"},{"vendor":"schneider-electric","product":"tsxp573634m_firmware"},{"vendor":"schneider-electric","product":"tsxp57454m_firmware"},{"vendor":"schneider-electric","product":"tsxp574634m_firmware"},{"vendor":"schneider-electric","product":"tsxp57554m_firmware"},{"vendor":"schneider-electric","product":"tsxp575634m_firmware"},{"vendor":"schneider-electric","product":"tsxp576634m_firmware"}],"references":[{"url":"https://www.se.com/ww/en/download/document/SEVD-2019-344-01","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory"]},{"url":"https://www.us-cert.gov/ics/advisories/icsa-20-016-01","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","US Government Resource"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2019-6856"},{"url":"https://github.com/advisories/GHSA-xhgj-59fx-f85c"}],"sources":{"cve":[{"id":"CVE-2019-6856","description":"A CWE-754: Improper Check for Unusual or Exceptional Conditions vulnerability exists in Modicon M580, Modicon M340, Modicon Quantum, Modicon Premium (see security notification for specific versions) which could cause a Denial of Service when writing specific physical memory blocks using Modbus TCP.","status":"published","published":"2020-01-06T22:57:02Z","modified":"2026-05-29T14:37:57.75Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"adp"}],"cwes":["CWE-754"],"updated_at":"2026-11-02T14:20:23.381621Z"}],"euvd":[{"id":"EUVD-2019-16410","description":"A CWE-754: Improper Check for Unusual or Exceptional Conditions vulnerability exists in Modicon M580, Modicon M340, Modicon Quantum, Modicon Premium (see security notification for specific versions) which could cause a Denial of Service when writing specific physical memory blocks using Modbus TCP.","status":"published","published":"2020-01-06T22:57:02Z","modified":"2026-05-29T14:37:57Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T18:21:01.215325Z"}],"ghsa":[{"id":"GHSA-xhgj-59fx-f85c","title":"A CWE-754: Improper Check for Unusual or Exceptional Conditions vulnerability exists in Modicon...","description":"A CWE-754: Improper Check for Unusual or Exceptional Conditions vulnerability exists in Modicon M580, Modicon M340, Modicon Quantum, Modicon Premium (see security notification for specific versions) which could cause a Denial of Service when writing specific physical memory blocks using Modbus TCP.","status":"published","published":"2022-05-24T17:05:44Z","modified":"2026-05-29T15:31:24Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-754"],"updated_at":"2026-11-02T15:08:23.402135Z"}],"nvd":[{"id":"CVE-2019-6856","description":"A CWE-754: Improper Check for Unusual or Exceptional Conditions vulnerability exists in Modicon M580, Modicon M340, Modicon Quantum, Modicon Premium (see security notification for specific versions) which could cause a Denial of Service when writing specific physical memory blocks using Modbus TCP.","status":"published","published":"2020-01-06T23:15:11.317Z","modified":"2026-06-17T02:39:48.463Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-754"],"updated_at":"2026-11-02T14:05:41.313583Z"}]}}