CVE Watch—

CVE-2018-8639

Microsoft Windows Win32k Improper Resource Shutdown or Release Vulnerability

CVSS

—

No CVSS

EPSS

22.3%

p97

KEV

YES

Mar 3, 2025

Exploit Today

0-100

Published: — · Last modified: —

EPSS · 30d

22.3%EPSS · 30 days22.3%

2026-06-302026-07-16

KEV catalog record

Product

Microsoft / Windows

Vulnerability

Microsoft Windows Win32k Improper Resource Shutdown or Release Vulnerability

Added to KEV

Mar 3, 2025

Remediate by

Mar 24, 2025

Known ransomware use

Yes

Summary description

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

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Notes

https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2018-8639 ; https://nvd.nist.gov/vuln/detail/CVE-2018-8639

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