{"schemaVersion":3,"id":"CVE-2018-8581","aliases":[],"status":"published","duplicateOf":null,"title":"Microsoft Exchange Server Privilege Escalation Vulnerability","description":"An elevation of privilege vulnerability exists in Microsoft Exchange Server, aka \"Microsoft Exchange Server Elevation of Privilege Vulnerability.\" This affects Microsoft Exchange Server.","dates":{"published":"2018-11-14T01:00:00.000Z","modified":"2025-10-21T23:45:47.294Z","reserved":null,"kevAdded":["2022-03-03T00:00:00.000Z"],"kevDue":["2022-03-17T00:00:00.000Z"]},"cvss":{"headline":{"score":7.4,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":7.4,"severity":"high","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":7.4,"severity":"high","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":5.8,"severity":"medium","vector":"AV:N/AC:M/Au:N/C:P/I:P/A:N","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.27355,"percentile":0.98045,"severity":"high","asOf":"2026-10-18T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-18T00:00:00.000Z","baselineScore":0.27355},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.27355,"percentile":0.98045}],"last30":[{"date":"2026-09-18T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.27355,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.27355,"percentile":0.98045}]},"kev":{"state":"listed","entries":[{"source":"cisa","sourceLabel":"CISA","dateAdded":"2022-03-03T00:00:00.000Z","dueDate":"2022-03-17T00:00:00.000Z","requiredAction":"Apply updates per vendor instructions.","name":"Microsoft Exchange Server Privilege Escalation Vulnerability","description":"A privilege escalation vulnerability exists in Microsoft Exchange Server. An attacker who successfully exploited this vulnerability could attempt to impersonate any other user of the Exchange server.","notes":[{"type":"url","href":"https://nvd.nist.gov/vuln/detail/CVE-2018-8581","label":"nvd.nist.gov/vuln/detail/CVE-2018-8581"}],"vendor":"Microsoft","product":"Exchange Server","ransomware":true,"ransomwareUse":"Known","exploitationType":null}],"listedCount":1,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":true,"entry":{"source":"cisa","sourceLabel":"CISA","dateAdded":"2022-03-03T00:00:00.000Z","dueDate":"2022-03-17T00:00:00.000Z","requiredAction":"Apply updates per vendor instructions.","name":"Microsoft Exchange Server Privilege Escalation Vulnerability","description":"A privilege escalation vulnerability exists in Microsoft Exchange Server. An attacker who successfully exploited this vulnerability could attempt to impersonate any other user of the Exchange server.","notes":[{"type":"url","href":"https://nvd.nist.gov/vuln/detail/CVE-2018-8581","label":"nvd.nist.gov/vuln/detail/CVE-2018-8581"}],"vendor":"Microsoft","product":"Exchange Server","ransomware":true,"ransomwareUse":"Known","exploitationType":null}},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"known","sources":["cisa"]},"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":"2010","noFixRecorded":false,"fixedIn":null},{"text":"2013","noFixRecorded":false,"fixedIn":null},{"text":"2016","noFixRecorded":false,"fixedIn":null},{"text":"2019","noFixRecorded":false,"fixedIn":null}],"versionsText":"2010 | 2013 | 2016 | 2019","eol":{"isEol":true,"eolDate":"2020-10-13T00:00:00.000Z","matchMethod":"cpe","cycle":{"name":"2010","label":"2010 SP3 UR32","eolFrom":"2020-10-13T00:00:00.000Z","isLts":false,"isMaintained":false,"latestVersion":"14.3.513.0"},"product":{"name":"msexchange","label":"Microsoft Exchange","category":"server-app"}},"hubHref":"/vendor/microsoft/exchange_server"},{"vendor":"microsoft","product":"microsoft exchange server","name":"Microsoft Exchange Server","label":"microsoft exchange server","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"2010","noFixRecorded":false,"fixedIn":null},{"text":"2013","noFixRecorded":false,"fixedIn":null},{"text":"2016","noFixRecorded":false,"fixedIn":null},{"text":"2019","noFixRecorded":false,"fixedIn":null}],"versionsText":"2010 | 2013 | 2016 | 2019","eol":null,"hubHref":"/vendor/microsoft/microsoft_exchange_server"}],"affectedCount":2,"eol":{"hasEol":true,"count":1},"references":[{"url":"http://www.securitytracker.com/id/1042141","label":"www.securitytracker.com/id/1042141","hostname":"www.securitytracker.com","tags":["VDB Entry","X Refsource SECTRACK","Broken Link","Third Party Advisory"]},{"url":"http://www.securityfocus.com/bid/105837","label":"www.securityfocus.com/bid/105837","hostname":"www.securityfocus.com","tags":["VDB Entry","X Refsource BID","Broken Link","Third Party Advisory"]},{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8581","label":"portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8581","hostname":"portal.msrc.microsoft.com","tags":["X Refsource CONFIRM","Patch","Vendor Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-8581","label":"www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-8581","hostname":"www.cisa.gov","tags":["Government Resource","US Government Resource"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2018-11-14T01:00:00.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"kev-added","date":"2022-03-03T00:00:00.000Z","label":"Added to CISA KEV","detail":"Microsoft Exchange Server Privilege Escalation Vulnerability","source":"cisa"},{"kind":"kev-due","date":"2022-03-17T00:00:00.000Z","label":"CISA remediation due","detail":"Apply updates per vendor instructions.","source":"cisa"},{"kind":"modified","date":"2025-10-21T23:45:47.294Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":90,"level":"critical","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-19T09:50:32.920Z","stale":false,"partial":false}}