{"answers":{"affected":"It affects 29 products.","exploited":"There is no known exploitation of CVE-2019-6856 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2019-6856 yet. Limit exposure of the affected software until one is available.","what":"CVE-2019-6856 is a high-severity denial of service vulnerability in Schneider Electric SE Modicon M580, Modicon M340, Modicon Quantum,  Modicon Premium (see security notification for specific versions), published on 6 Jan 2020. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2019-6856 and fix it if it is affected.\n\nWhat it is: CVE-2019-6856 is a high-severity denial of service vulnerability in Schneider Electric SE Modicon M580, Modicon M340, Modicon Quantum,  Modicon Premium (see security notification for specific versions), published on 6 Jan 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2019-6856 in the wild and no public exploit code.\n\nAffected product: Schneider Electric SE Modicon M580, Modicon M340, Modicon Quantum,  Modicon Premium (see security notification for specific versions). No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2019-6856/ (Markdown: https://insights.sbomify.com/CVE-2019-6856/index.md)","id":"CVE-2019-6856","markdown":"https://insights.sbomify.com/CVE-2019-6856/index.md","name":"CVE-2019-6856","record":{"aliases":["GHSA-xhgj-59fx-f85c"],"analysis":{"component_type":"ics_ot","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Schneider Electric PLC","requires_auth":"none","summary":"Attackers can cause a Denial of Service on Schneider Electric Modicon PLCs by writing specific physical memory blocks via Modbus TCP.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"schneider","cpe":[{"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","vendor":"schneider-electric"}],"cvss":{"score":7.5,"severity":"high","source":"cisa-adp","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-754","name":"Improper Check for Unusual or Exceptional Conditions"}],"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.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":null,"headline":"Denial of service in Modicon M580, Modicon M340, Modicon Quantum, Modicon Premium (see security notification for specific versions)","id":"CVE-2019-6856","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"denial_of_service","year":"2019"},"n_packages":0,"n_references":2,"next":{"headline":"Denial of service in Modicon M580, Modicon M340, Modicon Quantum, Modicon Premium (see security notification for specific versions)","id":"CVE-2019-6857"},"packages":[],"prev":{"headline":"Auth bypass in EcoStruxure Control Expert (all versions prior to 14.1 Hot Fix), Unity Pro (all versions), Modicon M340 (all versions prior to V3.20) , and Modicon M580 (all versions prior to V3.10)","id":"CVE-2019-6855"},"products":["Modicon M580, Modicon M340, Modicon Quantum,  Modicon Premium (see security notification for specific versions)"],"published":"2020-01-06","related":[{"cvss_score":9.8,"headline":"Missing authorization in Web Server on Modicon M340, Legacy Offers Modicon Quantum and Modicon Premium and associated Communication Modules (see security notification for affected versions)","id":"CVE-2020-7540","kev_date_added":null,"published":"2020-12-11"},{"cvss_score":7.5,"headline":"Information disclosure in Modicon M340 CPUs: BMXP34 (Versions prior to V3.40), Modicon M340 X80 Ethernet Communication Modules: BMXNOE0100 (H), BMXNOE0110 (H), BMXNOC0401, BMXNOR0200H RTU (All Versions), Modicon Premium Processors with integrated Ethernet (Copro): TSXP574634, TSXP575634, TSXP576634 (All Versions), Modicon Quantum Processors with Integrated Ethernet (Copro): 140CPU65xxxxx (All Versions), Modicon Quantum Communication Modules: 140NOE771x1, 140NOC78x00, 140NOC77101 (All Versions), Modicon Premium Communication Modules: TSXETY4103, TSXETY5103 (All Versions)","id":"CVE-2021-22785","kev_date_added":null,"published":"2022-02-11"},{"cvss_score":7.5,"headline":"Denial of service in Modicon M340 CPUs: BMXP34 (Versions prior to V3.40), Modicon M340 X80 Ethernet Communication Modules: BMXNOE0100 (H), BMXNOE0110 (H), BMXNOC0401, BMXNOR0200H RTU (All Versions), Modicon Premium Processors with integrated Ethernet (Copro): TSXP574634, TSXP575634, TSXP576634 (All Versions), Modicon Quantum Processors with Integrated Ethernet (Copro): 140CPU65xxxxx (All Versions), Modicon Quantum Communication Modules: 140NOE771x1, 140NOC78x00, 140NOC77101 (All Versions), Modicon Premium Communication Modules: TSXETY4103, TSXETY5103 (All Versions)","id":"CVE-2021-22787","kev_date_added":null,"published":"2022-02-11"},{"cvss_score":7.5,"headline":"Memory corruption in Modicon M340 CPUs: BMXP34 (Versions prior to V3.40), Modicon M340 X80 Ethernet Communication Modules: BMXNOE0100 (H), BMXNOE0110 (H), BMXNOC0401, BMXNOR0200H RTU (All Versions), Modicon Premium Processors with integrated Ethernet (Copro): TSXP574634, TSXP575634, TSXP576634 (All Versions), Modicon Quantum Processors with Integrated Ethernet (Copro): 140CPU65xxxxx (All Versions), Modicon Quantum Communication Modules: 140NOE771x1, 140NOC78x00, 140NOC77101 (All Versions), Modicon Premium Communication Modules: TSXETY4103, TSXETY5103 (All Versions)","id":"CVE-2021-22788","kev_date_added":null,"published":"2022-02-11"},{"cvss_score":7.5,"headline":"Path traversal in Web Server on Modicon M340, Legacy Offers Modicon Quantum and Modicon Premium and associated Communication Modules (see security notification for affected versions)","id":"CVE-2020-7535","kev_date_added":null,"published":"2020-12-11"},{"cvss_score":7.5,"headline":"Denial of service in Web Server on Modicon M340, Legacy Offers Modicon Quantum and Modicon Premium and associated Communication Modules (see security notification for affected versions)","id":"CVE-2020-7539","kev_date_added":null,"published":"2020-12-11"},{"cvss_score":7.5,"headline":"Denial of service in Modicon M580, Modicon M340, Legacy Controllers Modicon Quantum \u0026 Modicon Premium (see security notifications for affected versions)","id":"CVE-2020-7542","kev_date_added":null,"published":"2020-12-11"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-05-29","vendors":["Schneider Electric SE"]},"summary":"Attackers can cause a Denial of Service on Schneider Electric Modicon PLCs by writing specific physical memory blocks via Modbus TCP.","url":"https://insights.sbomify.com/CVE-2019-6856/"}