{"id":"CVE-2020-7559","aliases":["EUVD-2020-28684","GHSA-28rp-9f44-h4v6"],"status":"published","title":"A CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability...","description":"A CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability exists in PLC Simulator on EcoStruxureª Control Expert (now Unity Pro) (all versions) that could cause a crash of the PLC simulator present in EcoStruxureª Control Expert software when receiving a specially crafted request over Modbus.","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":"2026-11-11","score":0.01905,"percentile":0.79997,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-120"],"published":"2020-11-19T21:04:25Z","modified":"2026-06-17T03:25:00Z","products":[{"vendor":"schneider-electric","product":"ecostruxure_control_expert"}],"references":[{"url":"https://www.se.com/ww/en/download/document/SEVD-2020-315-07","tags":["x_refsource_MISC","x_transferred","Patch","Product","Vendor Advisory"]},{"url":"https://www.talosintelligence.com/vulnerability_reports/TALOS-2020-1140","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-7559"},{"url":"https://github.com/advisories/GHSA-28rp-9f44-h4v6"}],"sources":{"cve":[{"id":"CVE-2020-7559","description":"A CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability exists in PLC Simulator on EcoStruxureª Control Expert (now Unity Pro) (all versions) that could cause a crash of the PLC simulator present in EcoStruxureª Control Expert software when receiving a specially crafted request over Modbus.","status":"published","published":"2020-11-19T21:04:25Z","modified":"2024-08-04T09:33:19.465Z","cwes":["CWE-120"],"updated_at":"2026-11-02T14:35:58.331892Z"}],"euvd":[{"id":"EUVD-2020-28684","description":"A CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability exists in PLC Simulator on EcoStruxureª Control Expert (now Unity Pro) (all versions) that could cause a crash of the PLC simulator present in EcoStruxureª Control Expert software when receiving a specially crafted request over Modbus.","status":"published","published":"2020-11-19T21:04:25Z","modified":"2024-08-04T09:33:19Z","updated_at":"2026-11-03T03:07:59.603443Z"}],"ghsa":[{"id":"GHSA-28rp-9f44-h4v6","title":"A CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability...","description":"A CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability exists in PLC Simulator on EcoStruxureª Control Expert (now Unity Pro) (all versions) that could cause a crash of the PLC simulator present in EcoStruxureª Control Expert software when receiving a specially crafted request over Modbus.","status":"published","published":"2022-05-24T22:28:03Z","modified":"2023-01-30T05:05:00Z","cwes":["CWE-120"],"updated_at":"2026-11-02T14:47:10.51539Z"}],"nvd":[{"id":"CVE-2020-7559","description":"A CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability exists in PLC Simulator on EcoStruxureª Control Expert (now Unity Pro) (all versions) that could cause a crash of the PLC simulator present in EcoStruxureª Control Expert software when receiving a specially crafted request over Modbus.","status":"published","published":"2020-11-19T22:15:14.8Z","modified":"2026-06-17T03:25:00.46Z","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":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-120"],"updated_at":"2026-11-02T14:06:25.394006Z"}]}}