{"id":"CVE-2021-26427","aliases":["EUVD-2021-13232","GHSA-wwfc-ph8v-qxf5"],"status":"published","title":"Microsoft Exchange Server Remote Code Execution Vulnerability","description":"Microsoft Exchange Server Remote Code Execution Vulnerability","severity":{"version":"3.1","score":9,"vector":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00893,"percentile":0.59755,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2021-10-13T00:26:32Z","modified":"2026-06-17T03:43:23Z","products":[{"vendor":"microsoft","product":"exchange_server"},{"vendor":"microsoft","product":"microsoft exchange server 2013 cumulative update 23"},{"vendor":"microsoft","product":"microsoft exchange server 2016 cumulative update 21"},{"vendor":"microsoft","product":"microsoft exchange server 2016 cumulative update 22"},{"vendor":"microsoft","product":"microsoft exchange server 2019 cumulative update 10"},{"vendor":"microsoft","product":"microsoft exchange server 2019 cumulative update 11"}],"references":[{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26427","tags":["x_refsource_MISC","x_transferred","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-26427"},{"url":"https://github.com/advisories/GHSA-wwfc-ph8v-qxf5"}],"sources":{"cve":[{"id":"CVE-2021-26427","title":"Microsoft Exchange Server Remote Code Execution Vulnerability","description":"Microsoft Exchange Server Remote Code Execution Vulnerability","status":"published","published":"2021-10-13T00:26:32Z","modified":"2024-08-03T20:26:25.215Z","cvss":[{"version":"3.1","score":9,"vector":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"critical","assessor":"cna"}],"updated_at":"2026-11-02T14:32:57.368269Z"}],"euvd":[{"id":"EUVD-2021-13232","description":"Microsoft Exchange Server Remote Code Execution Vulnerability","status":"published","published":"2021-10-13T00:26:32Z","modified":"2024-08-03T20:26:25Z","cvss":[{"version":"3.1","score":9,"vector":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"critical"}],"updated_at":"2026-11-03T03:24:51.962182Z"}],"ghsa":[{"id":"GHSA-wwfc-ph8v-qxf5","title":"Microsoft Exchange Server Remote Code Execution Vulnerability","description":"Microsoft Exchange Server Remote Code Execution Vulnerability","status":"published","published":"2022-05-24T19:17:34Z","modified":"2023-08-10T05:04:38Z","cvss":[{"version":"3.1","score":9,"vector":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T14:54:44.654498Z"}],"nvd":[{"id":"CVE-2021-26427","description":"Microsoft Exchange Server Remote Code Execution Vulnerability","status":"published","published":"2021-10-13T01:15:09.213Z","modified":"2026-06-17T03:43:23.693Z","cvss":[{"version":"3.1","score":9,"vector":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"critical","assessor":"secondary"},{"version":"3.1","score":9.6,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"critical","assessor":"secondary"},{"version":"2.0","score":5.8,"vector":"AV:A/AC:L/Au:N/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:06:59.689345Z"}]}}