{"schemaVersion":3,"id":"CVE-2021-40479","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"Microsoft Excel Remote Code Execution Vulnerability","dates":{"published":"2021-10-13T00:27:26.000Z","modified":"2024-08-04T02:44:10.364Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.8,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/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":7.8,"severity":"high","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/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":7.8,"severity":"high","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":6.8,"severity":"medium","vector":"AV:N/AC:M/Au:N/C:P/I:P/A:P","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.02302,"percentile":0.8306,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-19T00:00:00.000Z","baselineScore":0.02302},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.02302,"percentile":0.8306}],"last30":[{"date":"2026-09-19T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.02302,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.02302,"percentile":0.8306}]},"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":"365_apps","name":"365 apps","label":"365_apps","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"na","noFixRecorded":false,"fixedIn":null}],"versionsText":"na","eol":null,"hubHref":"/vendor/microsoft/365_apps"},{"vendor":"microsoft","product":"microsoft 365 apps for enterprise","name":"Microsoft 365 Apps for Enterprise","label":"microsoft 365 apps for enterprise","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 16.0.1, < https://aka.ms/OfficeSecurityReleases","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 16.0.1, < https://aka.ms/OfficeSecurityReleases","eol":null,"hubHref":"/vendor/microsoft/microsoft_365_apps_for_enterprise"},{"vendor":"microsoft","product":"microsoft office 2013 service pack 1","name":"Microsoft Office 2013 Service Pack 1","label":"microsoft office 2013 service pack 1","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 15.0.0, < 15.0.5389.1000","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 15.0.0, < 15.0.5389.1000","eol":null,"hubHref":"/vendor/microsoft/microsoft_office_2013_service_pack_1"},{"vendor":"microsoft","product":"microsoft office 2016","name":"Microsoft Office 2016","label":"microsoft office 2016","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 16.0.0, < 16.0.5227.1000","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 16.0.0, < 16.0.5227.1000","eol":null,"hubHref":"/vendor/microsoft/microsoft_office_2016"},{"vendor":"microsoft","product":"microsoft office 2019","name":"Microsoft Office 2019","label":"microsoft office 2019","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 19.0.0, < https://aka.ms/OfficeSecurityReleases","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 19.0.0, < https://aka.ms/OfficeSecurityReleases","eol":null,"hubHref":"/vendor/microsoft/microsoft_office_2019"},{"vendor":"microsoft","product":"microsoft office ltsc 2021","name":"Microsoft Office LTSC 2021","label":"microsoft office ltsc 2021","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 16.0.1, < https://aka.ms/OfficeSecurityReleases","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 16.0.1, < https://aka.ms/OfficeSecurityReleases","eol":null,"hubHref":"/vendor/microsoft/microsoft_office_ltsc_2021"},{"vendor":"microsoft","product":"office","name":"office","label":"office","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"2013:sp1","noFixRecorded":false,"fixedIn":null},{"text":"2016","noFixRecorded":false,"fixedIn":null},{"text":"2019","noFixRecorded":false,"fixedIn":null}],"versionsText":"2013:sp1 | 2016 | 2019","eol":{"isEol":true,"eolDate":"2025-10-14T00:00:00.000Z","matchMethod":"cpe","cycle":{"name":"2016","label":"2016","eolFrom":"2025-10-14T00:00:00.000Z","isLts":false,"isMaintained":false,"latestVersion":null},"product":{"name":"office","label":"Microsoft Office","category":"app"}},"hubHref":"/vendor/microsoft/office"},{"vendor":"microsoft","product":"office_long_term_servicing_channel","name":"office long term servicing channel","label":"office_long_term_servicing_channel","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"2021","noFixRecorded":false,"fixedIn":null}],"versionsText":"2021","eol":null,"hubHref":"/vendor/microsoft/office_long_term_servicing_channel"}],"affectedCount":8,"eol":{"hasEol":true,"count":1},"references":[{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-40479","label":"portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-40479","hostname":"portal.msrc.microsoft.com","tags":["X Refsource MISC","Patch","Vendor Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2021-10-13T00:27:26.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2024-08-04T02:44:10.364Z","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":"2026-10-19T19:28:38.444Z","stale":false,"partial":false}}