{"schemaVersion":3,"id":"CVE-2021-36942","aliases":[],"status":"published","duplicateOf":null,"title":"Microsoft Windows Local Security Authority (LSA) Spoofing Vulnerability","description":"Windows LSA Spoofing Vulnerability","dates":{"published":"2021-08-12T18:12:29.000Z","modified":"2026-08-10T15:10:06.814Z","reserved":null,"kevAdded":["2021-11-03T00:00:00.000Z"],"kevDue":["2021-11-17T00:00:00.000Z"]},"cvss":{"headline":{"score":7.5,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:F/RL:O/RC:C","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:F/RL:O/RC:C","exploitability":null,"impact":null,"computed":false},{"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:H/I:N/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":0.66023,"percentile":0.9927,"severity":"critical","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-19T00:00:00.000Z","baselineScore":0.66023},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.66023,"percentile":0.9927}],"last30":[{"date":"2026-09-19T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.66023,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.66023,"percentile":0.9927}]},"kev":{"state":"listed","entries":[{"source":"cisa","sourceLabel":"CISA","dateAdded":"2021-11-03T00:00:00.000Z","dueDate":"2021-11-17T00:00:00.000Z","requiredAction":"Apply updates per vendor instructions.","name":"Microsoft Windows Local Security Authority (LSA) Spoofing Vulnerability","description":"Microsoft Windows Local Security Authority (LSA) contains a spoofing vulnerability allowing an unauthenticated attacker to call a method on the LSARPC interface and coerce the domain controller to authenticate against another server using NTLM.","notes":[{"type":"url","href":"https://nvd.nist.gov/vuln/detail/CVE-2021-36942","label":"nvd.nist.gov/vuln/detail/CVE-2021-36942"}],"vendor":"Microsoft","product":"Windows","ransomware":true,"ransomwareUse":"Known","exploitationType":null}],"listedCount":1,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":true,"entry":{"source":"cisa","sourceLabel":"CISA","dateAdded":"2021-11-03T00:00:00.000Z","dueDate":"2021-11-17T00:00:00.000Z","requiredAction":"Apply updates per vendor instructions.","name":"Microsoft Windows Local Security Authority (LSA) Spoofing Vulnerability","description":"Microsoft Windows Local Security Authority (LSA) contains a spoofing vulnerability allowing an unauthenticated attacker to call a method on the LSARPC interface and coerce the domain controller to authenticate against another server using NTLM.","notes":[{"type":"url","href":"https://nvd.nist.gov/vuln/detail/CVE-2021-36942","label":"nvd.nist.gov/vuln/detail/CVE-2021-36942"}],"vendor":"Microsoft","product":"Windows","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":[{"id":"REF_DA92A14D26110AC2","name":"Exploit Reference (kb.cert.org)","source":"reference","url":"https://www.kb.cert.org/vuls/id/405600","maturity":"unknown","reliabilityScore":0.2,"verified":false,"type":null,"platforms":[],"requiresAuth":null,"exploitdb":null,"metasploit":null},{"id":"MSF_AUXILIARY_SCANNER_DCERPC_PETITPOTAM","name":"PetitPotam","source":"metasploit","url":"https://github.com/rapid7/metasploit-framework/blob/master/modules/auxiliary/scanner/dcerpc/petitpotam.rb","maturity":"poc","reliabilityScore":0.5,"verified":false,"type":"remote","platforms":[],"requiresAuth":false,"exploitdb":null,"metasploit":{"fullname":"auxiliary/scanner/dcerpc/petitpotam","rank":"300","rankName":"normal","postAuth":false,"check":false,"stability":[],"sideEffects":[],"reliability":[]}}],"exploitCount":2,"weaknesses":[],"affected":[{"vendor":"microsoft","product":"windows_server_2004","name":"windows server 2004","label":"windows_server_2004","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 10.0.19041.1165","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 10.0.19041.1165","eol":null,"hubHref":"/vendor/microsoft/windows_server_2004"},{"vendor":"microsoft","product":"windows_server_2008","name":"windows server 2008","label":"windows_server_2008","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"na","noFixRecorded":false,"fixedIn":null},{"text":"r2:sp1","noFixRecorded":false,"fixedIn":null}],"versionsText":"na | r2:sp1","eol":null,"hubHref":"/vendor/microsoft/windows_server_2008"},{"vendor":"microsoft","product":"windows server 2008 r2 service pack 1","name":"Windows Server 2008 R2 Service Pack 1","label":"windows server 2008 r2 service pack 1","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 6.1.7601.0, < 6.1.7601.25685","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 6.1.7601.0, < 6.1.7601.25685","eol":null,"hubHref":"/vendor/microsoft/windows_server_2008_r2_service_pack_1"},{"vendor":"microsoft","product":"windows server 2008 r2 service pack 1 (server core installation)","name":"Windows Server 2008 R2 Service Pack 1 (Server Core installation)","label":"windows server 2008 r2 service pack 1 (server core installation)","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 6.1.7601.0, < 6.1.7601.25685","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 6.1.7601.0, < 6.1.7601.25685","eol":null,"hubHref":"/vendor/microsoft/windows_server_2008_r2_service_pack_1_server_core_installation"},{"vendor":"microsoft","product":"windows server 2008 service pack 2","name":"Windows Server 2008 Service Pack 2","label":"windows server 2008 service pack 2","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 6.0.6003.0, < 6.0.6003.21192","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 6.0.6003.0, < 6.0.6003.21192","eol":null,"hubHref":"/vendor/microsoft/windows_server_2008_service_pack_2"},{"vendor":"microsoft","product":"windows server 2008 service pack 2 (server core installation)","name":"Windows Server 2008 Service Pack 2 (Server Core installation)","label":"windows server 2008 service pack 2 (server core installation)","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 6.0.6003.0, < 6.0.6003.21192","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 6.0.6003.0, < 6.0.6003.21192","eol":null,"hubHref":"/vendor/microsoft/windows_server_2008_service_pack_2_server_core_installation"},{"vendor":"microsoft","product":"windows_server_2012","name":"windows server 2012","label":"windows_server_2012","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"≥ 6.2.9200.0, < 6.2.9200.23435","noFixRecorded":false,"fixedIn":null},{"text":"na","noFixRecorded":false,"fixedIn":null},{"text":"r2","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 6.2.9200.0, < 6.2.9200.23435 | na | r2","eol":null,"hubHref":"/vendor/microsoft/windows_server_2012"},{"vendor":"microsoft","product":"windows server 2012 r2","name":"Windows Server 2012 R2","label":"windows server 2012 r2","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 6.3.9600.0, < 6.3.9600.20094","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 6.3.9600.0, < 6.3.9600.20094","eol":null,"hubHref":"/vendor/microsoft/windows_server_2012_r2"},{"vendor":"microsoft","product":"windows server 2012 r2 (server core installation)","name":"Windows Server 2012 R2 (Server Core installation)","label":"windows server 2012 r2 (server core installation)","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 6.3.9600.0, < 6.3.9600.20094","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 6.3.9600.0, < 6.3.9600.20094","eol":null,"hubHref":"/vendor/microsoft/windows_server_2012_r2_server_core_installation"},{"vendor":"microsoft","product":"windows server 2012 (server core installation)","name":"Windows Server 2012 (Server Core installation)","label":"windows server 2012 (server core installation)","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 6.2.9200.0, < 6.2.9200.23435","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 6.2.9200.0, < 6.2.9200.23435","eol":null,"hubHref":"/vendor/microsoft/windows_server_2012_server_core_installation"},{"vendor":"microsoft","product":"windows_server_2016","name":"windows server 2016","label":"windows_server_2016","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"≥ 10.0.14393.0, < 10.0.14393.4583","noFixRecorded":false,"fixedIn":null},{"text":"< 10.0.14393.4583","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 10.0.14393.0, < 10.0.14393.4583 | < 10.0.14393.4583","eol":null,"hubHref":"/vendor/microsoft/windows_server_2016"},{"vendor":"microsoft","product":"windows server 2016 (server core installation)","name":"Windows Server 2016 (Server Core installation)","label":"windows server 2016 (server core installation)","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 10.0.14393.0, < 10.0.14393.4583","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 10.0.14393.0, < 10.0.14393.4583","eol":null,"hubHref":"/vendor/microsoft/windows_server_2016_server_core_installation"},{"vendor":"microsoft","product":"windows_server_2019","name":"windows server 2019","label":"windows_server_2019","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"≥ 10.0.17763.0, < 10.0.17763.2114","noFixRecorded":false,"fixedIn":null},{"text":"< 10.0.17763.2114","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 10.0.17763.0, < 10.0.17763.2114 | < 10.0.17763.2114","eol":null,"hubHref":"/vendor/microsoft/windows_server_2019"},{"vendor":"microsoft","product":"windows server 2019 (server core installation)","name":"Windows Server 2019 (Server Core installation)","label":"windows server 2019 (server core installation)","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 10.0.17763.0, < 10.0.17763.2114","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 10.0.17763.0, < 10.0.17763.2114","eol":null,"hubHref":"/vendor/microsoft/windows_server_2019_server_core_installation"},{"vendor":"microsoft","product":"windows_server_20h2","name":"windows server 20h2","label":"windows_server_20h2","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 10.0.19042.1165","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 10.0.19042.1165","eol":null,"hubHref":"/vendor/microsoft/windows_server_20h2"},{"vendor":"microsoft","product":"windows server version 2004","name":"Windows Server version 2004","label":"windows server version 2004","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 10.0.0, < 10.0.19041.1165","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 10.0.0, < 10.0.19041.1165","eol":null,"hubHref":"/vendor/microsoft/windows_server_version_2004"},{"vendor":"microsoft","product":"windows server version 20h2","name":"Windows Server version 20H2","label":"windows server version 20h2","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 10.0.0, < 10.0.19042.1165","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 10.0.0, < 10.0.19042.1165","eol":null,"hubHref":"/vendor/microsoft/windows_server_version_20h2"}],"affectedCount":17,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-36942","label":"msrc.microsoft.com/update-guide/vulnerability/CVE-2021-36942","hostname":"msrc.microsoft.com","tags":["Vendor Advisory","Patch"]},{"url":"https://www.kb.cert.org/vuls/id/405600","label":"www.kb.cert.org/vuls/id/405600","hostname":"www.kb.cert.org","tags":["Third Party Advisory","X Refsource CERT VN","X Transferred","Exploit","US Government Resource"]},{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-36942","label":"portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-36942","hostname":"portal.msrc.microsoft.com","tags":["X Refsource MISC","X Transferred","Patch","Vendor Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-36942","label":"www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-36942","hostname":"www.cisa.gov","tags":["Government Resource","US Government Resource"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2021-08-12T18:12:29.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"kev-added","date":"2021-11-03T00:00:00.000Z","label":"Added to CISA KEV","detail":"Microsoft Windows Local Security Authority (LSA) Spoofing Vulnerability","source":"cisa"},{"kind":"kev-due","date":"2021-11-17T00:00:00.000Z","label":"CISA remediation due","detail":"Apply updates per vendor instructions.","source":"cisa"},{"kind":"modified","date":"2026-08-10T15:10:06.814Z","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":"2026-10-19T22:45:29.316Z","stale":false,"partial":false}}