{"id":"CVE-2025-64666","aliases":["EUVD-2025-202236","GHSA-mr7p-99h9-v459"],"status":"published","title":"Microsoft Exchange Server Elevation of Privilege Vulnerability","description":"Improper input validation in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.01093,"percentile":0.65675,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-20"],"published":"2025-12-09T17:55:45Z","modified":"2026-10-14T21:10:00Z","products":[{"vendor":"microsoft","product":"exchange_server"},{"vendor":"microsoft","product":"exchange_server_subscription_edition"},{"vendor":"microsoft","product":"microsoft exchange server 2016 cumulative update 23"},{"vendor":"microsoft","product":"microsoft exchange server 2019 cumulative update 14"},{"vendor":"microsoft","product":"microsoft exchange server 2019 cumulative update 15"},{"vendor":"microsoft","product":"microsoft exchange server subscription edition rtm"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-64666","tags":["vendor-advisory","patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-64666"},{"url":"https://github.com/advisories/GHSA-mr7p-99h9-v459"}],"sources":{"cve":[{"id":"CVE-2025-64666","title":"Microsoft Exchange Server Elevation of Privilege Vulnerability","description":"Improper input validation in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.","status":"published","published":"2025-12-09T17:55:45.263Z","modified":"2026-04-16T14:18:39.837Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"high","assessor":"cna"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:32:47.08757Z"}],"euvd":[{"id":"EUVD-2025-202236","description":"Improper input validation in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.","status":"published","published":"2025-12-09T17:55:45Z","modified":"2026-04-16T14:18:39Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"high"}],"updated_at":"2026-11-02T19:24:24.386229Z"}],"ghsa":[{"id":"GHSA-mr7p-99h9-v459","title":"Improper input validation in Microsoft Exchange Server allows an authorized attacker to elevate...","description":"Improper input validation in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.","status":"published","published":"2025-12-09T18:30:47Z","modified":"2025-12-09T18:30:55Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T15:05:06.989368Z"}],"nvd":[{"id":"CVE-2025-64666","description":"Improper input validation in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.","status":"published","published":"2025-12-09T18:16:05.91Z","modified":"2026-10-14T21:10:00.183Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:11:49.468427Z"}]}}