CVE-2018-8639 Known ransomware use

Microsoft Windows Win32k Improper Resource Shutdown or Release Vulnerability

Microsoft — Windows

Added to KEV catalog: 3 March 2025
Federal remediation due date: 24 March 2025
Weakness classification (CWE): CWE-404

CISA 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

View on NVD View on MITRE CVE View full CISA catalog

More Microsoft Vulnerabilities

CVE-2026-65660

Microsoft SharePoint Code Injection Vulnerability

CVE-2026-81963

Microsoft Windows Link Following Vulnerability

CVE-2026-85880

Microsoft Windows Heap-Based Buffer Overflow Vulnerability

CVE-2019-1068

Microsoft SQL Server Remote Code Execution Vulnerability

CVE-2026-33824

Microsoft Internet Key Exchange (IKE) Service Extensions Double Free Vulnerability

Confirm Your Exposure

Is this vulnerability present in your environment?

CRS delivers independent VAPT assessments that identify exactly which known-exploited vulnerabilities exist in your network, applications, and infrastructure.

Explore VAPT Services