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CVE-2018-8639: Microsoft Windows Win32k Improper Resource Shutdown or Release Vulnerability
Microsoft Windows · in CISA KEV since 2025-03-03
2025-03-03added to KEV
2025-03-24federal remediation due date
22.18%EPSS exploit probability (30 days) 97.6th percentile
7.8 HIGHCVSS 3.1
Knownknown ransomware use
2,273days from NVD publication to KEV
What it is
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.
Required action (CISA)
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
| CWE | CWE-404 |
|---|---|
| CVSS vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVD published | 2018-12-12 (Analyzed) |
Original records: NVD · CISA KEV · JSON: /api/cve/CVE-2018-8639.json · all KEV CVEs
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Get the full file: Exploited Vulnerabilities Brief – September 2026 ($29): this month's KEV additions ranked by EPSS, ransomware use and due date, ready to hand to a patch team. Checkout by Polar.