{"id":"CVE-2025-64666","title":"Improper input validation in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.","summary":"Improper input validation in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-20"],"vendor":"microsoft","product":"exchange_server","affected":["exchange_server = 2016","exchange_server = 2019","exchange_server_subscription_edition < 15.02.2562.035"],"patched":["exchange_server_subscription_edition 15.02.2562.035"],"published":"2025-12-09","updated":"2026-10-14","sourceUpdated":"2026-10-14T21:10:00.183","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-64666","references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-64666","label":"secure@microsoft.com"}],"tags":["nvd"],"epss":0.0102,"epssPercentile":0.62645,"ingestedAt":"2026-10-14T21:57:04.763Z","slug":"CVE-2025-64666","body":"## Overview\n\nImproper input validation in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.\n\n## Affected\n\n- `exchange_server = 2016`\n- `exchange_server = 2019`\n- `exchange_server_subscription_edition < 15.02.2562.035`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `exchange_server_subscription_edition 15.02.2562.035`","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.2,"exploitation":0,"ransomware":0},"changes":[]}