{"schemaVersion":3,"id":"CVE-2020-1066","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"An elevation of privilege vulnerability exists in .NET Framework which could allow an attacker to elevate their privilege level.\nTo exploit the vulnerability, an attacker would first have to access the local machine, and then run a malicious program.\nThe update addresses the vulnerability by correcting how .NET Framework activates COM objects.","dates":{"published":"2020-05-21T22:52:55.000Z","modified":"2026-08-19T16:33:31.239Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.8,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"NVD","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":7.8,"severity":"high","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":4.6,"severity":"medium","vector":"AV:L/AC:L/Au:N/C:P/I:P/A:P","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.02522,"percentile":0.84624,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":0.020999999999999838,"baselineDate":"2026-09-19T00:00:00.000Z","baselineScore":0.02501},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.02522,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.02522,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.02522,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.02522,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.02522,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.02522,"percentile":0.84624}],"last30":[{"date":"2026-09-19T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.02501,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.02522,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.02522,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.02522,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.02522,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.02522,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.02522,"percentile":0.84624}]},"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":[],"affected":[{"vendor":"microsoft","product":"microsoft .net framework 3.0 service pack 2","name":"Microsoft .NET Framework 3.0 Service Pack 2","label":"microsoft .net framework 3.0 service pack 2","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 3.0.0, < publication","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 3.0.0, < publication","eol":null,"hubHref":"/vendor/microsoft/microsoft_net_framework_30_service_pack_2"},{"vendor":"microsoft","product":"microsoft .net framework 3.5.1","name":"Microsoft .NET Framework 3.5.1","label":"microsoft .net framework 3.5.1","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 3.5.0, < publication","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 3.5.0, < publication","eol":null,"hubHref":"/vendor/microsoft/microsoft_net_framework_351"},{"vendor":"microsoft","product":".net_framework","name":".net framework","label":".net_framework","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"3.0:sp2","noFixRecorded":false,"fixedIn":null},{"text":"3.5.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"3.0:sp2 | 3.5.1","eol":null,"hubHref":"/vendor/microsoft/net_framework"}],"affectedCount":3,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-1066","label":"msrc.microsoft.com/update-guide/vulnerability/CVE-2020-1066","hostname":"msrc.microsoft.com","tags":["Vendor Advisory","Patch"]},{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1066","label":"portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1066","hostname":"portal.msrc.microsoft.com","tags":["X Refsource MISC","X Transferred","Patch","Vendor Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2020-05-21T22:52:55.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-08-19T16:33:31.239Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":32,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-19T19:27:05.615Z","stale":false,"partial":false}}