{"id":"CVE-2022-21855","aliases":["EUVD-2022-27011","GHSA-m86g-hcfp-6vv3"],"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":"2026-11-09","score":0.00949,"percentile":0.61464,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2022-01-11T20:22:28Z","modified":"2026-06-17T04:27:07Z","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://msrc.microsoft.com/update-guide/vulnerability/CVE-2022-21855","tags":["vendor-advisory"]},{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2022-21855","tags":["x_refsource_MISC","x_transferred"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-21855"},{"url":"https://github.com/advisories/GHSA-m86g-hcfp-6vv3"}],"sources":{"cve":[{"id":"CVE-2022-21855","title":"Microsoft Exchange Server Remote Code Execution Vulnerability","description":"Microsoft Exchange Server Remote Code Execution Vulnerability","status":"published","published":"2022-01-11T20:22:28Z","modified":"2025-01-02T18:22:48.703Z","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":"2026-11-02T14:34:29.478363Z"}],"euvd":[{"id":"EUVD-2022-27011","description":"Microsoft Exchange Server Remote Code Execution Vulnerability","status":"published","published":"2022-01-11T20:22:28Z","modified":"2025-01-02T18:22:48Z","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":"2026-11-03T00:04:29.532536Z"}],"ghsa":[{"id":"GHSA-m86g-hcfp-6vv3","title":"Microsoft Exchange Server Remote Code Execution Vulnerability. This CVE ID is unique from CVE...","description":"Microsoft Exchange Server Remote Code Execution Vulnerability. This CVE ID is unique from CVE-2022-21846, CVE-2022-21969.","status":"published","published":"2022-01-12T00:01:03Z","modified":"2024-11-14T21:32:47Z","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":"2026-11-02T14:58:50.830346Z"}],"nvd":[{"id":"CVE-2022-21855","description":"Microsoft Exchange Server Remote Code Execution Vulnerability","status":"published","published":"2022-01-11T21:15:10.087Z","modified":"2026-06-17T04:27:07.207Z","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":"2.0","score":7.7,"vector":"AV:A/AC:L/Au:S/C:C/I:C/A:C","level":"high","assessor":"primary"}],"updated_at":"2026-11-02T14:07:10.836864Z"}]}}