{"id":"CVE-2025-21391","title":"Windows Storage Elevation of Privilege Vulnerability","summary":"Windows Storage Elevation of Privilege Vulnerability","severity":"high","cvss":7.1,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H","cwe":["CWE-59"],"vendor":"microsoft","product":"windows_10_1507","affected":["windows_10_1507 < 10.0.10240.20915","windows_10_1607 < 10.0.14393.7785","windows_10_1809 < 10.0.17763.6893","windows_10_21h2 < 10.0.19044.5487","windows_10_22h2 < 10.0.19045.5487","windows_11_22h2 < 10.0.22621.4890","windows_11_23h2 < 10.0.22631.4890","windows_11_24h2 < 10.0.26100.3107","windows_server_2016 < 10.0.14393.7785","windows_server_2019 < 10.0.17763.6893","windows_server_2022 < 10.0.20348.3148","windows_server_2022_23h2 < 10.0.25398.1425","windows_server_2025 < 10.0.26100.3107"],"patched":["windows_10_1507 10.0.10240.20915","windows_10_1607 10.0.14393.7785","windows_10_1809 10.0.17763.6893","windows_10_21h2 10.0.19044.5487","windows_10_22h2 10.0.19045.5487","windows_11_22h2 10.0.22621.4890","windows_11_23h2 10.0.22631.4890","windows_11_24h2 10.0.26100.3107","windows_server_2016 10.0.14393.7785","windows_server_2019 10.0.17763.6893","windows_server_2022 10.0.20348.3148","windows_server_2022_23h2 10.0.25398.1425","windows_server_2025 10.0.26100.3107"],"published":"2025-02-11","updated":"2026-09-24","sourceUpdated":"2026-09-24T13:10:00.320","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-21391","references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21391","label":"secure@microsoft.com"},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-21391","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","kev","in-the-wild"],"epss":0.02303,"epssPercentile":0.82595,"kev":true,"kevDateAdded":"2025-02-11","kevDueDate":"2025-03-04","kevRansomware":false,"exploited":true,"zeroDay":true,"ingestedAt":"2026-09-24T13:43:25.652Z","slug":"CVE-2025-21391","body":"## Overview\n\nWindows Storage Elevation of Privilege Vulnerability\n\n## Affected\n\n- `windows_10_1507 < 10.0.10240.20915`\n- `windows_10_1607 < 10.0.14393.7785`\n- `windows_10_1809 < 10.0.17763.6893`\n- `windows_10_21h2 < 10.0.19044.5487`\n- `windows_10_22h2 < 10.0.19045.5487`\n- `windows_11_22h2 < 10.0.22621.4890`\n- `windows_11_23h2 < 10.0.22631.4890`\n- `windows_11_24h2 < 10.0.26100.3107`\n- `windows_server_2016 < 10.0.14393.7785`\n- `windows_server_2019 < 10.0.17763.6893`\n- `windows_server_2022 < 10.0.20348.3148`\n- `windows_server_2022_23h2 < 10.0.25398.1425`\n- `windows_server_2025 < 10.0.26100.3107`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `windows_10_1507 10.0.10240.20915`\n- `windows_10_1607 10.0.14393.7785`\n- `windows_10_1809 10.0.17763.6893`\n- `windows_10_21h2 10.0.19044.5487`\n- `windows_10_22h2 10.0.19045.5487`\n- `windows_11_22h2 10.0.22621.4890`\n- `windows_11_23h2 10.0.22631.4890`\n- `windows_11_24h2 10.0.26100.3107`\n- `windows_server_2016 10.0.14393.7785`\n- `windows_server_2019 10.0.17763.6893`\n- `windows_server_2022 10.0.20348.3148`\n- `windows_server_2022_23h2 10.0.25398.1425`\n- `windows_server_2025 10.0.26100.3107`","depth":"abyssal","depthScore":65,"depthScoreParts":{"impact":39.1,"likelihood":0.5,"exploitation":25,"ransomware":0},"changes":[]}