{"schemaVersion":3,"id":"CVE-2020-5956","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"An issue was discovered in SdLegacySmm in Insyde InsydeH2O with kernel 5.1 before 05.15.11, 5.2 before 05.25.11, 5.3 before 05.34.11, and 5.4 before 05.42.11. The software SMI handler allows untrusted external input because it does not verify CommBuffer.","dates":{"published":"2022-01-05T22:55:57.000Z","modified":"2024-08-04T08:47:40.903Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.5,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"NVD","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"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:H/A:N","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":5,"severity":"medium","vector":"AV:N/AC:L/Au:N/C:N/I:P/A:N","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00806,"percentile":0.56097,"severity":"low","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-20T00:00:00.000Z","baselineScore":0.00806},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00806,"percentile":0.56097}],"last30":[{"date":"2026-09-20T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00806,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00806,"percentile":0.56097}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-20","name":"Improper Input Validation","description":"The product receives input or data, but it does\n        not validate or incorrectly validates that the input has the\n        properties that are required to process the data safely and\n        correctly.","type":"weakness","status":"Stable","abstraction":"Class","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/20.html"}],"affected":[{"vendor":"insyde","product":"insydeh2o","name":"insydeh2o","label":"insydeh2o","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 5.2, < 5.25.11","noFixRecorded":false,"fixedIn":null},{"text":"≥ 5.1, < 05.15.11","noFixRecorded":false,"fixedIn":null},{"text":"≥ 5.3, < 05.34.11","noFixRecorded":false,"fixedIn":null},{"text":"≥ 5.4, < 05.42.11","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 5.2, < 5.25.11 | ≥ 5.1, < 05.15.11 | ≥ 5.3, < 05.34.11 | ≥ 5.4, < 05.42.11","eol":null,"hubHref":"/vendor/insyde/insydeh2o"}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://www.insyde.com/security-pledge","label":"www.insyde.com/security-pledge","hostname":"www.insyde.com","tags":["X Refsource MISC","Vendor Advisory"]},{"url":"https://security.netapp.com/advisory/ntap-20220223-0001/","label":"security.netapp.com/advisory/ntap-20220223-0001/","hostname":"security.netapp.com","tags":["X Refsource CONFIRM","Third Party Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2022-01-05T22:55:57.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2024-08-04T08:47:40.903Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":30,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-21T09:25:57.969Z","stale":false,"partial":false}}