{"schemaVersion":3,"id":"CVE-2021-33768","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"Microsoft Exchange Server Elevation of Privilege Vulnerability","dates":{"published":"2021-07-14T17:53:42.000Z","modified":"2026-08-10T15:11:36.947Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":8,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":8,"severity":"high","vector":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":8,"severity":"high","vector":"CVSS:3.1/AV:A/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":5.2,"severity":"medium","vector":"AV:A/AC:L/Au:S/C:P/I:P/A:P","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.01235,"percentile":0.68642,"severity":"low","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-20T00:00:00.000Z","baselineScore":0.01235},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.01235,"percentile":0.68642}],"last30":[{"date":"2026-09-20T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.01235,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.01235,"percentile":0.68642}]},"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":"exchange_server","name":"Exchange Server","label":"exchange_server","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"2016:cumulative_update_20","noFixRecorded":false,"fixedIn":null},{"text":"2016:cumulative_update_21","noFixRecorded":false,"fixedIn":null},{"text":"2019:cumulative_update_10","noFixRecorded":false,"fixedIn":null},{"text":"2019:cumulative_update_9","noFixRecorded":false,"fixedIn":null}],"versionsText":"2016:cumulative_update_20 | 2016:cumulative_update_21 | 2019:cumulative_update_10 | 2019:cumulative_update_9","eol":{"isEol":null,"eolDate":null,"matchMethod":"cpe","cycle":null,"product":{"name":"msexchange","label":"Microsoft Exchange","category":"server-app"}},"hubHref":"/vendor/microsoft/exchange_server"},{"vendor":"microsoft","product":"microsoft exchange server 2016 cumulative update 20","name":"Microsoft Exchange Server 2016 Cumulative Update 20","label":"microsoft exchange server 2016 cumulative update 20","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 15.01.0, < 15.01.2242.012","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 15.01.0, < 15.01.2242.012","eol":null,"hubHref":"/vendor/microsoft/microsoft_exchange_server_2016_cumulative_update_20"},{"vendor":"microsoft","product":"microsoft exchange server 2016 cumulative update 21","name":"Microsoft Exchange Server 2016 Cumulative Update 21","label":"microsoft exchange server 2016 cumulative update 21","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 15.01.0, < 15.01.2308.014","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 15.01.0, < 15.01.2308.014","eol":null,"hubHref":"/vendor/microsoft/microsoft_exchange_server_2016_cumulative_update_21"},{"vendor":"microsoft","product":"microsoft exchange server 2019 cumulative update 10","name":"Microsoft Exchange Server 2019 Cumulative Update 10","label":"microsoft exchange server 2019 cumulative update 10","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 15.02.0, < 15.02.0922.013","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 15.02.0, < 15.02.0922.013","eol":null,"hubHref":"/vendor/microsoft/microsoft_exchange_server_2019_cumulative_update_10"},{"vendor":"microsoft","product":"microsoft exchange server 2019 cumulative update 9","name":"Microsoft Exchange Server 2019 Cumulative Update 9","label":"microsoft exchange server 2019 cumulative update 9","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 15.02.0, < 15.02.0858.015","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 15.02.0, < 15.02.0858.015","eol":null,"hubHref":"/vendor/microsoft/microsoft_exchange_server_2019_cumulative_update_9"}],"affectedCount":5,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-33768","label":"msrc.microsoft.com/update-guide/vulnerability/CVE-2021-33768","hostname":"msrc.microsoft.com","tags":["Vendor Advisory","Patch"]},{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-33768","label":"portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-33768","hostname":"portal.msrc.microsoft.com","tags":["X Refsource MISC","X Transferred","Patch","Vendor Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2021-07-14T17:53:42.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-08-10T15:11:36.947Z","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":"2026-10-20T22:03:10.010Z","stale":false,"partial":false}}