CISA KEV · Known exploitedHigh

CVE-2018-8589

Microsoft Win32k

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.

CVSS: 7.8
EPSS: 3.02%
CISA KEV: Listed
Published: 2018.11.14

PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV

Exploit probability3.02%

Technical severityCVSS 7.8

Vulnerability overview

Affected product and versions

Product: Microsoft Win32k
Affected versions: 32-bit Systems Service Pack 2, 32-bit Systems Service Pack 2 (Server Core installation), Itanium-Based Systems Service Pack 2, x64-based Systems Service Pack 2, x64-based Systems Service Pack 2 (Server Core installation), 32-bit Systems Service Pack 1, x64-based Systems Service Pack 1, Itanium-Based Systems Service Pack 1, x64-based Systems Service Pack 1 (Server Core installation), r2
Fixed versions: No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

CISA required action

Apply updates per vendor instructions.

Due date: 2022.06.13

1
Identify
Confirm that Microsoft Win32k and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE: Not available
KEV added: 2022.05.23
Ransomware use: 미확인