{"schemaVersion":3,"id":"CVE-2021-35533","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"Improper Input Validation vulnerability in the APDU parser in the Bidirectional Communication Interface (BCI) IEC 60870-5-104 function of Hitachi Energy RTU500 series allows an attacker to cause the receiving RTU500 CMU of which the BCI is enabled to reboot when receiving a specially crafted message. By default, BCI IEC 60870-5-104 function is disabled (not configured). This issue affects: Hitachi Energy RTU500 series CMU Firmware version 12.0.* (all versions); CMU Firmware version 12.2.* (all versions); CMU Firmware version 12.4.* (all versions).","dates":{"published":"2021-11-26T16:37:27.683Z","modified":"2024-09-16T21:02:16.277Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.5,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":7.1,"severity":"high","vector":"AV:N/AC:M/Au:N/C:N/I:N/A:C","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.0095,"percentile":0.60832,"severity":"low","asOf":"2026-10-21T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-21T00:00:00.000Z","baselineScore":0.0095},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.0092,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.0092,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.0092,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.0092,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.0092,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.0095,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.0095,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.0095,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.0095,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.0095,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.0095,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.0095,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.0095,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.0095,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.0095,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.0095,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.0095,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.0095,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.0095,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.0095,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.0095,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.0095,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.0095,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.0095,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.0095,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.0095,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.0095,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.0095,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.0095,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.0095,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.0095,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.0095,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.0095,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.0095,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.0095,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.0095,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.0095,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.0095,"percentile":0.60832}],"last30":[{"date":"2026-09-21T00:00:00.000Z","score":0.0095,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.0095,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.0095,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.0095,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.0095,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.0095,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.0095,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.0095,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.0095,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.0095,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.0095,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.0095,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.0095,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.0095,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.0095,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.0095,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.0095,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.0095,"percentile":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