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"Microsoft", "product": "Windows Server 2008 R2 Service Pack 1", "versions": [{"status": "affected", "version": "6.1.0", "lessThan": "6.1.7601.25712", "versionType": "custom"}], "platforms": ["x64-based Systems"]}, {"cpes": ["cpe:2.3:o:microsoft:windows_server_2008_R2:6.1.7601.25712:*:*:*:*:*:x64:*"], "vendor": "Microsoft", "product": "Windows Server 2008 R2 Service Pack 1 (Server Core installation)", "versions": [{"status": "affected", "version": "6.0.0", "lessThan": "6.1.7601.25712", "versionType": "custom"}], "platforms": ["x64-based Systems"]}, {"cpes": ["cpe:2.3:o:microsoft:windows_server_2012:6.2.9200.23462:*:*:*:*:*:x64:*"], "vendor": "Microsoft", "product": "Windows Server 2012", "versions": [{"status": "affected", "version": "6.2.0", "lessThan": "6.2.9200.23462", "versionType": "custom"}], "platforms": ["x64-based Systems"]}, {"cpes": ["cpe:2.3:o:microsoft:windows_server_2012:6.2.9200.23462:*:*:*:*:*:x64:*"], "vendor": "Microsoft", "product": "Windows Server 2012 (Server Core installation)", "versions": [{"status": "affected", "version": "6.2.0", "lessThan": "6.2.9200.23462", "versionType": "custom"}], "platforms": ["x64-based Systems"]}, {"cpes": ["cpe:2.3:o:microsoft:windows_server_2012_R2:6.3.9600.20120:*:*:*:*:*:x64:*"], "vendor": "Microsoft", "product": "Windows Server 2012 R2", "versions": [{"status": "affected", "version": "6.3.0", "lessThan": "6.3.9600.20120", "versionType": "custom"}], "platforms": ["x64-based Systems"]}, {"cpes": ["cpe:2.3:o:microsoft:windows_server_2012_R2:6.3.9600.20120:*:*:*:*:*:x64:*"], "vendor": "Microsoft", "product": "Windows Server 2012 R2 (Server Core installation)", "versions": [{"status": "affected", "version": "6.3.0", "lessThan": "6.3.9600.20120", "versionType": "custom"}], "platforms": ["x64-based Systems"]}], "datePublic": "2021-09-14T07:00:00.000Z", "references": [{"url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-36955", "tags": ["x_refsource_MISC"]}], "descriptions": [{"lang": "en-US", "value": "Windows Common Log File System Driver Elevation of Privilege Vulnerability"}], "problemTypes": [{"descriptions": [{"lang": "en-US", "type": "Impact", "description": "Elevation of Privilege"}]}], "providerMetadata": {"orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "shortName": "microsoft", "dateUpdated": "2023-12-28T19:37:01.943Z"}}}, "cveMetadata": {"cveId": "CVE-2021-36955", "state": "PUBLISHED", "dateUpdated": "2025-10-21T23:25:33.593Z", "dateReserved": "2021-07-19T00:00:00.000Z", "assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "datePublished": "2021-09-15T11:23:32.000Z", "assignerShortName": "microsoft"}, "dataVersion": "5.1"}

{"cisaActionDue": "2021-11-17", "cisaExploitAdd": "2021-11-03", "cisaRequiredAction": "Apply updates per vendor instructions.", "cisaVulnerabilityName": "Microsoft Windows Common Log File System (CLFS) Driver Privilege Escalation Vulnerability", "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:*:*", "matchCriteriaId": "C1658517-428C-4FAF-8EEE-3FD68557AAD1", "versionEndExcluding": "10.0.10240.19060", "vulnerable": true}, {"criteria": "cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:*:*", "matchCriteriaId": "4BF6C51E-7240-457D-A36C-5494AEE41AB1", "versionEndExcluding": "10.0.14393.4651", "vulnerable": true}, {"criteria": "cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:*:*", "matchCriteriaId": "1673EF18-FB21-450C-B75D-89279B6779FA", "versionEndExcluding": "10.0.17763.2183", "vulnerable": true}, {"criteria": "cpe:2.3:o:microsoft:windows_10_1909:*:*:*:*:*:*:*:*", "matchCriteriaId": "F3F77B0B-2A62-4E21-B042-BB86ABA68BE3", "versionEndExcluding": "10.0.18363.1801", "vulnerable": true}, {"criteria": "cpe:2.3:o:microsoft:windows_10_2004:*:*:*:*:*:*:*:*", "matchCriteriaId": "F4E719E7-7D50-49F6-ABD4-77B1F7ECC68C", "versionEndExcluding": "10.0.19041.1237", "vulnerable": true}, {"criteria": "cpe:2.3:o:microsoft:windows_10_20h2:*:*:*:*:*:*:*:*", "matchCriteriaId": "71B3072F-0DB3-4C23-AD96-62BF71345E61", "versionEndExcluding": "10.0.19042.1237", "vulnerable": true}, {"criteria": "cpe:2.3:o:microsoft:windows_10_21h1:*:*:*:*:*:*:*:*", "matchCriteriaId": "CB038EC1-8E36-48C1-8E2E-3B8B6585D25E", "versionEndExcluding": "10.0.19043.1237", "vulnerable": true}, {"criteria": "cpe:2.3:o:microsoft:windows_7:-:sp1:*:*:-:*:-:*", "matchCriteriaId": "DCF7181C-41D5-46E6-8812-10A51CB208A6", "vulnerable": true}, {"criteria": "cpe:2.3:o:microsoft:windows_8.1:-:*:*:*:-:*:-:*", "matchCriteriaId": "48032169-A0ED-4D24-85BE-D1FE1EEF9460", "vulnerable": true}, {"criteria": "cpe:2.3:o:microsoft:windows_rt_8.1:-:*:*:*:*:*:*:*", "matchCriteriaId": "C6CE5198-C498-4672-AF4C-77AB4BE06C5C", "vulnerable": true}, {"criteria": "cpe:2.3:o:microsoft:windows_server_2004:*:*:*:*:*:*:*:*", "matchCriteriaId": "046119DC-43BF-4077-9721-12E2EFD7F492", "versionEndExcluding": "10.0.19041.1237", "vulnerable": true}, {"criteria": "cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:*:*", "matchCriteriaId": "5F422A8C-2C4E-42C8-B420-E0728037E15C", "vulnerable": true}, {"criteria": "cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:*", "matchCriteriaId": "AF07A81D-12E5-4B1D-BFF9-C8D08C32FF4F", "vulnerable": true}, {"criteria": "cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*", "matchCriteriaId": "A7DF96F8-BA6A-4780-9CA3-F719B3F81074", "vulnerable": true}, {"criteria": "cpe:2.3:o:microsoft:windows_server_2012:-:r2:*:*:*:*:*:*", "matchCriteriaId": "5F2558DF-2D1F-46BA-ABF1-08522D33268E", "vulnerable": true}, {"criteria": "cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*", "matchCriteriaId": "EAF9D18C-B459-48F2-8451-20E7B04EAD36", "versionEndExcluding": "10.0.14393.4651", "vulnerable": true}, {"criteria": "cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*", "matchCriteriaId": "8867C828-131C-466E-9A35-80184659D540", "versionEndExcluding": "10.0.17763.2183", "vulnerable": true}, {"criteria": "cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*", "matchCriteriaId": "0663409D-4AE8-4BD9-85FE-9EAED15AE9DB", "versionEndExcluding": "10.0.20348.230", "vulnerable": true}, {"criteria": "cpe:2.3:o:microsoft:windows_server_20h2:*:*:*:*:*:*:*:*", "matchCriteriaId": "292B87C7-3AC9-48FF-91D7-21D6D74C84A9", "versionEndExcluding": "10.0.19042.1237", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Windows Common Log File System Driver Elevation of Privilege Vulnerability"}, {"lang": "es", "value": "Una Vulnerabilidad de Elevaci\u00f3n de Privilegios de Windows Common Log File System Driver. Este CVE ID es diferente de CVE-2021-36963, CVE-2021-38633"}], "id": "CVE-2021-36955", "lastModified": "2025-10-30T19:14:08.070", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "LOCAL", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 4.6, "confidentialityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "vectorString": "AV:L/AC:L/Au:N/C:P/I:P/A:P", "version": "2.0"}, "exploitabilityScore": 3.9, "impactScore": 6.4, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "secure@microsoft.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Secondary"}]}, "published": "2021-09-15T12:15:13.197", "references": [{"source": "secure@microsoft.com", "tags": ["Patch", "Vendor Advisory"], "url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-36955"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Vendor Advisory"], "url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-36955"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["US Government Resource"], "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-36955"}], "sourceIdentifier": "secure@microsoft.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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