{"id":"CVE-2026-27917","title":"Use after free in Windows WFP NDIS Lightweight Filter Driver (wfplwfs.sys) allows an authorized attacker to elevate privileges locally.","summary":"Use after free in Windows WFP NDIS Lightweight Filter Driver (wfplwfs.sys) allows an authorized attacker to elevate privileges locally.","severity":"high","cvss":7,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-416"],"vendor":"microsoft","product":"windows_10_1607","affected":["windows_10_1607 < 10.0.14393.9060","windows_10_1809 < 10.0.17763.8644","windows_10_21h2 < 10.0.19044.7184","windows_10_22h2 < 10.0.19045.7184","windows_11_23h2 < 10.0.22631.6936","windows_11_24h2 < 10.0.26100.8246","windows_11_25h2 < 10.0.26200.8246","windows_11_26h1 < 10.0.28000.1836","windows_server_2012 = r2","windows_server_2016 < 10.0.14393.9060","windows_server_2019 < 10.0.17763.8644","windows_server_2022 < 10.0.20348.5020","windows_server_2022_23h2 < 10.0.25398.2274","windows_server_2025 < 10.0.26100.32690"],"patched":["windows_10_1607 10.0.14393.9060","windows_10_1809 10.0.17763.8644","windows_10_21h2 10.0.19044.7184","windows_10_22h2 10.0.19045.7184","windows_11_23h2 10.0.22631.6936","windows_11_24h2 10.0.26100.8246","windows_11_25h2 10.0.26200.8246","windows_11_26h1 10.0.28000.1836","windows_server_2016 10.0.14393.9060","windows_server_2019 10.0.17763.8644","windows_server_2022 10.0.20348.5020","windows_server_2022_23h2 10.0.25398.2274","windows_server_2025 10.0.26100.32690"],"published":"2026-04-14","updated":"2026-10-14","sourceUpdated":"2026-10-14T23:17:38.803","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-27917","references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-27917","label":"secure@microsoft.com"}],"tags":["nvd","cve.org"],"epss":0.00243,"epssPercentile":0.15409,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-04-15T03:58:09.300198Z"},"ingestedAt":"2026-09-25T18:14:20.455Z","slug":"CVE-2026-27917","body":"## Overview\n\nUse after free in Windows WFP NDIS Lightweight Filter Driver (wfplwfs.sys) allows an authorized attacker to elevate privileges locally.\n\n## Affected\n\n- `windows_10_1607 < 10.0.14393.9060`\n- `windows_10_1809 < 10.0.17763.8644`\n- `windows_10_21h2 < 10.0.19044.7184`\n- `windows_10_22h2 < 10.0.19045.7184`\n- `windows_11_23h2 < 10.0.22631.6936`\n- `windows_11_24h2 < 10.0.26100.8246`\n- `windows_11_25h2 < 10.0.26200.8246`\n- `windows_11_26h1 < 10.0.28000.1836`\n- `windows_server_2012 = r2`\n- `windows_server_2016 < 10.0.14393.9060`\n- `windows_server_2019 < 10.0.17763.8644`\n- `windows_server_2022 < 10.0.20348.5020`\n- `windows_server_2022_23h2 < 10.0.25398.2274`\n- `windows_server_2025 < 10.0.26100.32690`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `windows_10_1607 10.0.14393.9060`\n- `windows_10_1809 10.0.17763.8644`\n- `windows_10_21h2 10.0.19044.7184`\n- `windows_10_22h2 10.0.19045.7184`\n- `windows_11_23h2 10.0.22631.6936`\n- `windows_11_24h2 10.0.26100.8246`\n- `windows_11_25h2 10.0.26200.8246`\n- `windows_11_26h1 10.0.28000.1836`\n- `windows_server_2016 10.0.14393.9060`\n- `windows_server_2019 10.0.17763.8644`\n- `windows_server_2022 10.0.20348.5020`\n- `windows_server_2022_23h2 10.0.25398.2274`\n- `windows_server_2025 10.0.26100.32690`","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}