{ "data_version": "4.0", "data_type": "CVE", "data_format": "MITRE", "CVE_data_meta": { "ID": "CVE-2021-26855", "ASSIGNER": "secure@microsoft.com", "STATE": "PUBLIC" }, "description": { "description_data": [ { "lang": "eng", "value": "Microsoft Exchange Server Remote Code Execution Vulnerability" } ] }, "problemtype": { "problemtype_data": [ { "description": [ { "lang": "eng", "value": "Remote Code Execution" } ] } ] }, "affects": { "vendor": { "vendor_data": [ { "vendor_name": "Microsoft", "product": { "product_data": [ { "product_name": "Microsoft Exchange Server 2016 Cumulative Update 19", "version": { "version_data": [ { "version_affected": "<", "version_name": "15.01.0", "version_value": "publication" } ] } }, { "product_name": "Microsoft Exchange Server 2019 Cumulative Update 8", "version": { "version_data": [ { "version_affected": "<", "version_name": "15.02.0", "version_value": "publication" } ] } }, { "product_name": "Microsoft Exchange Server 2019", "version": { "version_data": [ { "version_affected": "<", "version_name": "15.02.0", "version_value": "publication" } ] } }, { "product_name": "Microsoft Exchange Server 2013 Cumulative Update 22", "version": { "version_data": [ { "version_affected": "<", "version_name": "15.00.0", "version_value": "publication" } ] } }, { "product_name": "Microsoft Exchange Server 2019 Cumulative Update 2", "version": { "version_data": [ { "version_affected": "<", "version_name": "15.02.0", "version_value": "publication" } ] } }, { "product_name": "Microsoft Exchange Server 2016 Cumulative Update 13", "version": { "version_data": [ { "version_affected": "<", "version_name": "15.01.0", "version_value": "publication" } ] } }, { "product_name": "Microsoft Exchange Server 2013 Cumulative Update 23", "version": { "version_data": [ { "version_affected": "<", "version_name": "15.00.0", "version_value": "publication" } ] } }, { "product_name": "Microsoft Exchange Server 2019 Cumulative Update 3", "version": { "version_data": [ { "version_affected": "<", "version_name": "15.02.0", "version_value": "publication" } ] } }, { "product_name": "Microsoft Exchange Server 2016 Cumulative Update 14", "version": { "version_data": [ { "version_affected": "<", "version_name": "15.01.0", "version_value": "publication" } ] } }, { "product_name": "Microsoft Exchange Server 2019 Cumulative Update 4", "version": { "version_data": [ { "version_affected": "<", "version_name": "15.02.0", "version_value": "publication" } ] } }, { "product_name": "Microsoft Exchange Server 2016 Cumulative Update 15", "version": { "version_data": [ { "version_affected": "<", "version_name": "15.01.0", "version_value": "publication" } ] } }, { "product_name": "Microsoft Exchange Server 2019 Cumulative Update 5", "version": { "version_data": [ { "version_affected": "<", "version_name": "15.02.0", "version_value": "publication" } ] } }, { "product_name": "Microsoft Exchange Server 2019 Cumulative Update 6", "version": { "version_data": [ { "version_affected": "<", "version_name": "15.02.0", "version_value": "publication" } ] } }, { "product_name": "Microsoft Exchange Server 2016 Cumulative Update 16", "version": { "version_data": [ { "version_affected": "<", "version_name": "15.01.0", "version_value": "publication" } ] } }, { "product_name": "Microsoft Exchange Server 2016 Cumulative Update 17", "version": { "version_data": [ { "version_affected": "<", "version_name": "15.01.0", "version_value": "publication" } ] } }, { "product_name": "Microsoft Exchange Server 2019 Cumulative Update 7", "version": { "version_data": [ { "version_affected": "<", "version_name": "15.02.0", "version_value": "publication" } ] } }, { "product_name": "Microsoft Exchange Server 2016 Cumulative Update 18", "version": { "version_data": [ { "version_affected": "<", "version_name": "15.01.0", "version_value": "publication" } ] } }, { "product_name": "Microsoft Exchange Server 2013 Cumulative Update 21", "version": { "version_data": [ { "version_affected": "<", "version_name": "15.00.0", "version_value": "publication" } ] } }, { "product_name": "Microsoft Exchange Server 2016 Cumulative Update 12", "version": { "version_data": [ { "version_affected": "<", "version_name": "15.01.0", "version_value": "publication" } ] } }, { "product_name": "Microsoft Exchange Server 2016 Cumulative Update 8", "version": { "version_data": [ { "version_affected": "<", "version_name": "15.01.0", "version_value": "publication" } ] } }, { "product_name": "Microsoft Exchange Server 2019 Cumulative Update 1", "version": { "version_data": [ { "version_affected": "<", "version_name": "15.02.0", "version_value": "publication" } ] } }, { "product_name": "Microsoft Exchange Server 2016 Cumulative Update 9", "version": { "version_data": [ { "version_affected": "<", "version_name": "15.01.0", "version_value": "publication" } ] } }, { "product_name": "Microsoft Exchange Server 2016 Cumulative Update 10", "version": { "version_data": [ { "version_affected": "<", "version_name": "15.01.0", "version_value": "publication" } ] } }, { "product_name": "Microsoft Exchange Server 2016 Cumulative Update 11", "version": { "version_data": [ { "version_affected": "<", "version_name": "15.01.0", "version_value": "publication" } ] } } ] } } ] } }, "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" }, { "url": "http://packetstormsecurity.com/files/161846/Microsoft-Exchange-2019-SSRF-Arbitrary-File-Write.html", "refsource": "MISC", "name": "http://packetstormsecurity.com/files/161846/Microsoft-Exchange-2019-SSRF-Arbitrary-File-Write.html" }, { "url": "http://packetstormsecurity.com/files/161938/Microsoft-Exchange-ProxyLogon-Remote-Code-Execution.html", "refsource": "MISC", "name": "http://packetstormsecurity.com/files/161938/Microsoft-Exchange-ProxyLogon-Remote-Code-Execution.html" }, { "url": "http://packetstormsecurity.com/files/162610/Microsoft-Exchange-2019-Unauthenticated-Email-Download.html", "refsource": "MISC", "name": "http://packetstormsecurity.com/files/162610/Microsoft-Exchange-2019-Unauthenticated-Email-Download.html" }, { "url": "http://packetstormsecurity.com/files/162736/Microsoft-Exchange-ProxyLogon-Collector.html", "refsource": "MISC", "name": "http://packetstormsecurity.com/files/162736/Microsoft-Exchange-ProxyLogon-Collector.html" } ] }, "impact": { "cvss": [ { "version": "3.1", "baseSeverity": "CRITICAL", "baseScore": 9.1, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:F/RL:O/RC:C" } ] } }