{"schema":"threatline.record/2","record":{"id":"CVE-2018-8639","aliases":[],"summary":"Microsoft Windows Win32k Improper Resource Shutdown or Release Vulnerability","details":"Microsoft Windows Win32k contains an improper resource shutdown or release vulnerability that allows for local, authenticated privilege escalation. An attacker who successfully exploited this vulnerability could run arbitrary code in kernel mode.","categories":["Operating systems"],"product":"Windows","vendor":"Microsoft","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2018-8639","source_modified_at":"2025-10-21T23:45:46.009Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Windows 7","vendor":"Microsoft","versions":[{"status":"affected","version":"32-bit Systems Service Pack 1"},{"status":"affected","version":"x64-based Systems Service Pack 1"}],"defaultStatus":null},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2018-8639","source_modified_at":"2025-10-21T23:45:46.009Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Windows Server 2012 R2","vendor":"Microsoft","versions":[{"status":"affected","version":"(Server Core installation)"}],"defaultStatus":null},{"source":"CVE 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Systems"},{"status":"affected","version":"x64-based Systems"}],"defaultStatus":null},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2018-8639","source_modified_at":"2025-10-21T23:45:46.009Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Windows 10 Servers","vendor":"Microsoft","versions":[{"status":"affected","version":"version 1709  (Server Core Installation)"},{"status":"affected","version":"version 1803  (Server Core Installation)"}],"defaultStatus":null}],"fixed_versions":[],"cvss":8.4,"severity":"High","kev":{"listed":true,"date_added":"2025-03-03","due_date":"2025-03-24","required_action":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","ransomware_campaign_use":"Known"},"epss":{"probability":0.22179,"percentile":0.97673,"score_date":"2026-10-23"},"published_at":"2018-12-12T00:00:00.000Z","modified_at":"2025-10-21T23:45:46.009Z","provenance":[{"source":"CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23T17:00:09.9001Z"},{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2018-8639","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2025-10-21T23:45:46.009Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2018-8639","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CISA KEV","CVE List","EPSS"],"references":[{"url":"https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2018-8639","source":"CISA KEV"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2018-8639","source":"CISA KEV"},{"source":"CVE List","url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8639","tags":["x_refsource_CONFIRM","x_transferred"]},{"source":"CVE List","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-8639","tags":["government-resource"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CISA ADP","ssvc":{"exploitation":"active","automatable":"no","technical_impact":"total","assessed_at":"2025-03-03T20:12:10.250486Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2025-10-21T23:45:46.009Z","content_hash":"afbb4c85b92b21c510e2e98a5569b51716ccbd3160c8c1b012ecc68b86883dd0"}}