CVE-2018-8589

7.8

HIGHCVSS v3.1 Base Score

50.44%

MEDIUM RiskEPSS (98th percentile)

KEV

NVD-CWE-noinfo

An elevation of privilege vulnerability exists when Windows improperly handles calls to Win32k.sys, aka "Windows Win32k Elevation of Privilege Vulnerability." This affects Windows Server 2008, Windows 7, Windows Server 2008 R2.

Published: 11/14/2018

Modified: 10/28/2025

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ACTIVELY EXPLOITED IN THE WILD

This vulnerability is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

Vulnerability Name:

Microsoft Win32k Privilege Escalation Vulnerability

Vendor / Product:

Microsoft Win32k

Required Action:

Apply updates per vendor instructions.

Due Date: 6/13/2022(OVERDUE)

Added to KEV:

5/23/2022

Notes:

https://nvd.nist.gov/vuln/detail/CVE-2018-8589

View CISA KEV Catalog

Vulnerability Summary

CVSS v3 Score

7.8HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v2 Score

7.2

AV:L/AC:L/Au:N/C:C/I:C/A:C

EPSS Score (Exploitation Probability)

50.44%MEDIUM Exploitation Risk

98th percentile

This vulnerability has a 50.44% probability of being exploited in the next 30 days, ranking higher than 98% of all scored CVEs.

CWE Classification

NVD-CWE-noinfo

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