{"api_version":"1","generated_at":"2026-07-24T02:25:02+00:00","cve":"CVE-2021-26855","urls":{"html":"https://cve.report/CVE-2021-26855","api":"https://cve.report/api/cve/CVE-2021-26855.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2021-26855","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-26855"},"summary":{"title":"CVE-2021-26855","description":"Microsoft Exchange Server Remote Code Execution Vulnerability This CVE ID is unique from CVE-2021-26412, CVE-2021-26854, CVE-2021-26857, CVE-2021-26858, CVE-2021-27065, CVE-2021-27078.","state":"PUBLIC","assigner":"secure@microsoft.com","published_at":"2021-03-03 00:15:00","updated_at":"2023-12-29 17:16:00"},"problem_types":["CWE-918"],"metrics":[],"references":[{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26855","name":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26855","refsource":"MISC","tags":["Patch","Vendor Advisory"],"title":"Security Update Guide - Microsoft Security Response Center","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"http://packetstormsecurity.com/files/162610/Microsoft-Exchange-2019-Unauthenticated-Email-Download.html","name":"http://packetstormsecurity.com/files/162610/Microsoft-Exchange-2019-Unauthenticated-Email-Download.html","refsource":"MISC","tags":[],"title":"Microsoft Exchange 2019 Unauthenticated Email Download ≈ Packet Storm","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"http://packetstormsecurity.com/files/162736/Microsoft-Exchange-ProxyLogon-Collector.html","name":"http://packetstormsecurity.com/files/162736/Microsoft-Exchange-ProxyLogon-Collector.html","refsource":"MISC","tags":[],"title":"Microsoft Exchange ProxyLogon Collector ≈ Packet Storm","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"http://packetstormsecurity.com/files/161846/Microsoft-Exchange-2019-SSRF-Arbitrary-File-Write.html","name":"http://packetstormsecurity.com/files/161846/Microsoft-Exchange-2019-SSRF-Arbitrary-File-Write.html","refsource":"MISC","tags":[],"title":"Microsoft Exchange 2019 SSRF / Arbitrary File Write  ≈ Packet Storm","mime":"text/html","httpstatus":"200","archivestatus":"0"},{"url":"http://packetstormsecurity.com/files/161938/Microsoft-Exchange-ProxyLogon-Remote-Code-Execution.html","name":"http://packetstormsecurity.com/files/161938/Microsoft-Exchange-ProxyLogon-Remote-Code-Execution.html","refsource":"MISC","tags":[],"title":"Microsoft Exchange ProxyLogon Remote Code Execution ≈ Packet Storm","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-26855","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-26855","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2021","cve_id":"26855","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"microsoft","cpe5":"exchange_server","cpe6":"2013","cpe7":"cumulative_update_21","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"26855","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"microsoft","cpe5":"exchange_server","cpe6":"2013","cpe7":"cumulative_update_22","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"26855","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"microsoft","cpe5":"exchange_server","cpe6":"2013","cpe7":"cumulative_update_23","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"26855","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"microsoft","cpe5":"exchange_server","cpe6":"2016","cpe7":"cumulative_update_10","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"26855","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"microsoft","cpe5":"exchange_server","cpe6":"2016","cpe7":"cumulative_update_11","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"26855","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"microsoft","cpe5":"exchange_server","cpe6":"2016","cpe7":"cumulative_update_12","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"26855","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"microsoft","cpe5":"exchange_server","cpe6":"2016","cpe7":"cumulative_update_13","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"26855","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"microsoft","cpe5":"exchange_server","cpe6":"2016","cpe7":"cumulative_update_14","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"26855","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"microsoft","cpe5":"exchange_server","cpe6":"2016","cpe7":"cumulative_update_15","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"26855","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"microsoft","cpe5":"exchange_server","cpe6":"2016","cpe7":"cumulative_update_16","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"26855","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"microsoft","cpe5":"exchange_server","cpe6":"2016","cpe7":"cumulative_update_17","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"26855","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"microsoft","cpe5":"exchange_server","cpe6":"2016","cpe7":"cumulative_update_18","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"26855","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"microsoft","cpe5":"exchange_server","cpe6":"2016","cpe7":"cumulative_update_19","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"26855","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"microsoft","cpe5":"exchange_server","cpe6":"2016","cpe7":"cumulative_update_8","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"26855","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"microsoft","cpe5":"exchange_server","cpe6":"2016","cpe7":"cumulative_update_9","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"26855","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"microsoft","cpe5":"exchange_server","cpe6":"2019","cpe7":"-","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"26855","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"microsoft","cpe5":"exchange_server","cpe6":"2019","cpe7":"cumulative_update_1","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"26855","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"microsoft","cpe5":"exchange_server","cpe6":"2019","cpe7":"cumulative_update_2","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"26855","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"microsoft","cpe5":"exchange_server","cpe6":"2019","cpe7":"cumulative_update_3","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"26855","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"microsoft","cpe5":"exchange_server","cpe6":"2019","cpe7":"cumulative_update_4","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"26855","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"microsoft","cpe5":"exchange_server","cpe6":"2019","cpe7":"cumulative_update_5","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"26855","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"microsoft","cpe5":"exchange_server","cpe6":"2019","cpe7":"cumulative_update_6","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"26855","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"microsoft","cpe5":"exchange_server","cpe6":"2019","cpe7":"cumulative_update_7","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"26855","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"microsoft","cpe5":"exchange_server","cpe6":"2019","cpe7":"cumulative_update_8","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"26855","vulnerable":"1","versionEndIncluding":"1","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"microsoft","cpe5":"exchange_server","cpe6":"2013","cpe7":"cumulative_update_23","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"26855","vulnerable":"1","versionEndIncluding":"1","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"microsoft","cpe5":"exchange_server","cpe6":"2016","cpe7":"cumulative_update_18","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"26855","vulnerable":"1","versionEndIncluding":"1","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"microsoft","cpe5":"exchange_server","cpe6":"2016","cpe7":"cumulative_update_19","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"26855","vulnerable":"1","versionEndIncluding":"1","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"microsoft","cpe5":"exchange_server","cpe6":"2019","cpe7":"cumulative_update_7","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"26855","vulnerable":"1","versionEndIncluding":"1","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"microsoft","cpe5":"exchange_server","cpe6":"2019","cpe7":"cumulative_update_8","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":{"cve_year":"2021","cve_id":"26855","cve":"CVE-2021-26855","vendorProject":"Microsoft","product":"Exchange Server","vulnerabilityName":"Microsoft Exchange Server Remote Code Execution Vulnerability","dateAdded":"2021-11-03","shortDescription":"Microsoft Exchange Server contains an unspecified vulnerability that allows for remote code execution. This vulnerability is part of the ProxyLogon exploit chain.","requiredAction":"Apply updates per vendor instructions.","dueDate":"2022-05-03","knownRansomwareCampaignUse":"Known","notes":"Reference CISA's ED 21-02 (https://www.cisa.gov/news-events/directives/ed-21-02-mitigate-microsoft-exchange-premises-product-vulnerabilities) for further guidance and requirements. Note: The due date for addressing this vulnerability aligns with the requirements outlined in ED 21-02. https://nvd.nist.gov/vuln/detail/CVE-2021-26855","cwes":"CWE-918","catalogVersion":"2026.07.23","updated_at":"2026-07-23 17:19:19"},"epss":{"cve_year":"2021","cve_id":"26855","cve":"CVE-2021-26855","epss":"0.999990000","percentile":"0.999910000","score_date":"2026-07-23","updated_at":"2026-07-24 00:10:13"},"legacy_qids":[]},"source_records":{"cve_program":{"data_type":"CVE","data_format":"MITRE","data_version":"4.0","CVE_data_meta":{"ASSIGNER":"secure@microsoft.com","ID":"CVE-2021-26855","STATE":"PUBLIC"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"Microsoft Exchange Server 2016 Cumulative Update 19","version":{"version_data":[{"version_value":""}]}},{"product_name":"Microsoft Exchange Server 2019 Cumulative Update 8","version":{"version_data":[{"version_value":""}]}},{"product_name":"Microsoft Exchange Server 2013","version":{"version_data":[{"version_value":"Cumulative Update 23"}]}},{"product_name":"Microsoft Exchange Server 2016 Cumulative Update 14","version":{"version_data":[{"version_value":""}]}},{"product_name":"Microsoft Exchange Server 2019 Cumulative Update 4","version":{"version_data":[{"version_value":""}]}},{"product_name":"Microsoft Exchange Server 2016 Cumulative Update 15","version":{"version_data":[{"version_value":""}]}},{"product_name":"Microsoft Exchange Server 2019 Cumulative Update 5","version":{"version_data":[{"version_value":""}]}},{"product_name":"Microsoft Exchange Server 2019 Cumulative Update 6","version":{"version_data":[{"version_value":""}]}},{"product_name":"Microsoft Exchange Server 2016 Cumulative Update 16","version":{"version_data":[{"version_value":""}]}},{"product_name":"Microsoft Exchange Server 2019 Cumulative Update 7","version":{"version_data":[{"version_value":""}]}},{"product_name":"Microsoft Exchange Server 2016 Cumulative Update 18","version":{"version_data":[{"version_value":""}]}}]},"vendor_name":"Microsoft"}]}},"description":{"description_data":[{"lang":"eng","value":"Microsoft Exchange Server Remote Code Execution Vulnerability This CVE ID is unique from CVE-2021-26412, CVE-2021-26854, CVE-2021-26857, CVE-2021-26858, CVE-2021-27065, CVE-2021-27078."}]},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"Remote Code Execution"}]}]},"references":{"reference_data":[{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26855","refsource":"MISC","name":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26855"},{"refsource":"MISC","name":"http://packetstormsecurity.com/files/161846/Microsoft-Exchange-2019-SSRF-Arbitrary-File-Write.html","url":"http://packetstormsecurity.com/files/161846/Microsoft-Exchange-2019-SSRF-Arbitrary-File-Write.html"},{"refsource":"MISC","name":"http://packetstormsecurity.com/files/161938/Microsoft-Exchange-ProxyLogon-Remote-Code-Execution.html","url":"http://packetstormsecurity.com/files/161938/Microsoft-Exchange-ProxyLogon-Remote-Code-Execution.html"},{"refsource":"MISC","name":"http://packetstormsecurity.com/files/162610/Microsoft-Exchange-2019-Unauthenticated-Email-Download.html","url":"http://packetstormsecurity.com/files/162610/Microsoft-Exchange-2019-Unauthenticated-Email-Download.html"},{"refsource":"MISC","name":"http://packetstormsecurity.com/files/162736/Microsoft-Exchange-ProxyLogon-Collector.html","url":"http://packetstormsecurity.com/files/162736/Microsoft-Exchange-ProxyLogon-Collector.html"}]}},"nvd":{"publishedDate":"2021-03-03 00:15:00","lastModifiedDate":"2023-12-29 17:16:00","problem_types":["CWE-918"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"NONE","baseScore":9.1,"baseSeverity":"CRITICAL"},"exploitabilityScore":3.9,"impactScore":5.2},"baseMetricV2":{"cvssV2":{"version":"2.0","vectorString":"AV:N/AC:L/Au:N/C:P/I:P/A:P","accessVector":"NETWORK","accessComplexity":"LOW","authentication":"NONE","confidentialityImpact":"PARTIAL","integrityImpact":"PARTIAL","availabilityImpact":"PARTIAL","baseScore":7.5},"severity":"HIGH","exploitabilityScore":10,"impactScore":6.4,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":false}},"configurations":{"CVE_data_version":"4.0","nodes":[{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_8:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_9:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_21:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_10:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_11:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_22:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_12:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_1:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_23:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_13:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_2:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_14:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_3:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_4:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_15:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:microsoft:exchange_server:2019:-:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_6:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_5:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_17:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_16:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_7:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_18:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_8:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_19:*:*:*:*:*:*","cpe_name":[]}]}]}},"legacy_mitre":{"record":{"CveYear":"2021","CveId":"26855","Ordinal":"201944","Title":"CVE-2021-26855","CVE":"CVE-2021-26855","Year":"2021"},"notes":[{"CveYear":"2021","CveId":"26855","Ordinal":"1","NoteData":"Microsoft Exchange Server Remote Code Execution Vulnerability This CVE ID is unique from CVE-2021-26412, CVE-2021-26854, CVE-2021-26857, CVE-2021-26858, CVE-2021-27065, CVE-2021-27078.","Type":"Description","Title":null},{"CveYear":"2021","CveId":"26855","Ordinal":"2","NoteData":"2021-03-02","Type":"Other","Title":"Published"},{"CveYear":"2021","CveId":"26855","Ordinal":"3","NoteData":"2021-05-21","Type":"Other","Title":"Modified"}]}}}