{"id":"CVE-2018-20818","aliases":["EUVD-2018-13360","GHSA-j22f-7hvx-mqp8"],"status":"published","title":"A buffer overflow vulnerability was discovered in the OpenPLC controller, in the OpenPLC_v2 and...","description":"A buffer overflow vulnerability was discovered in the OpenPLC controller, in the OpenPLC_v2 and OpenPLC_v3 versions. It occurs in the modbus.cpp mapUnusedIO() function, which can cause a runtime crash of the PLC or possibly have unspecified other impact.","severity":{"version":"3.0","score":9.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.01532,"percentile":0.74959,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-119"],"published":"2019-04-21T19:50:39Z","modified":"2026-06-17T01:53:32Z","products":[{"vendor":"openplcproject","product":"openplc_v2_firmware"},{"vendor":"openplcproject","product":"openplc_v3_firmware"}],"references":[{"url":"https://arxiv.org/pdf/1809.07477","tags":["x_refsource_MISC","x_transferred","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2018-20818"},{"url":"https://github.com/advisories/GHSA-j22f-7hvx-mqp8"}],"sources":{"cve":[{"id":"CVE-2018-20818","description":"A buffer overflow vulnerability was discovered in the OpenPLC controller, in the OpenPLC_v2 and OpenPLC_v3 versions. It occurs in the modbus.cpp mapUnusedIO() function, which can cause a runtime crash of the PLC or possibly have unspecified other impact.","status":"published","published":"2019-04-21T19:50:39Z","modified":"2024-08-05T12:12:27.603Z","updated_at":"2026-11-02T14:35:00.237825Z"}],"euvd":[{"id":"EUVD-2018-13360","description":"A buffer overflow vulnerability was discovered in the OpenPLC controller, in the OpenPLC_v2 and OpenPLC_v3 versions. It occurs in the modbus.cpp mapUnusedIO() function, which can cause a runtime crash of the PLC or possibly have unspecified other impact.","status":"published","published":"2019-04-21T19:50:39Z","modified":"2024-08-05T12:12:27Z","updated_at":"2026-11-03T02:39:29.769885Z"}],"ghsa":[{"id":"GHSA-j22f-7hvx-mqp8","title":"A buffer overflow vulnerability was discovered in the OpenPLC controller, in the OpenPLC_v2 and...","description":"A buffer overflow vulnerability was discovered in the OpenPLC controller, in the OpenPLC_v2 and OpenPLC_v3 versions. It occurs in the modbus.cpp mapUnusedIO() function, which can cause a runtime crash of the PLC or possibly have unspecified other impact.","status":"published","published":"2022-05-24T16:44:02Z","modified":"2024-04-04T00:02:35Z","cvss":[{"version":"3.0","score":9.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-119"],"updated_at":"2026-11-02T14:55:48.925076Z"}],"nvd":[{"id":"CVE-2018-20818","description":"A buffer overflow vulnerability was discovered in the OpenPLC controller, in the OpenPLC_v2 and OpenPLC_v3 versions. It occurs in the modbus.cpp mapUnusedIO() function, which can cause a runtime crash of the PLC or possibly have unspecified other impact.","status":"published","published":"2019-04-22T11:29:01.97Z","modified":"2026-06-17T01:53:32.4Z","cvss":[{"version":"3.0","score":9.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"cwes":["CWE-119"],"updated_at":"2026-11-02T14:04:55.136632Z"}]}}