CVE-2018-8589

ENISA EUVD: EUVD-2018-20204 ↗
Exploited in the Wild ✓ Confirmed 0-Day ★ Google Project Zero
Triaged: March 5, 2026 4 articles Published: 2018-11-14
VulnLookup ↗ NVD ↗ EUVD ↗ MITRE ↗ Advisory ↗ P0 Sheet ↗ CISA KEV ↗

EPSS Score

Source: FIRST.org · 2026-05-23
50.44%
probability
This CVE has a 50.44% probability of being exploited in the next 30 days.
0% Top 97.9th percentile of all CVEs 100%

CVSS v3.1

Source: VulnerabilityLookup (CIRCL)
7.8
HIGH
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v2 (legacy)

7.2
HIGH
Access Vector
Local
Access Complexity
Low
Authentication
None
Confidentiality
Complete
Integrity
Complete
Availability
Complete
AV:L/AC:L/Au:N/C:C/I:C/A:C

Description

VulnerabilityLookup (CNA)
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.

Affected Products

Microsoft
Windows Server 2008
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)
Microsoft
Windows 7
32-bit Systems Service Pack 1 x64-based Systems Service Pack 1
Microsoft
Windows Server 2008 R2
Itanium-Based Systems Service Pack 1 x64-based Systems Service Pack 1 x64-based Systems Service Pack 1 (Server Core installation)

Google Project Zero

Discovered
Oct. 17, 2018
Patched
Nov. 13, 2018
Reported by
Boris Larin (Oct0xor) & Igor Soumenkov (2igosha) of Kaspersky Lab
Root Cause Analysis
???

Signal Intelligence

Confidenceⓘ
95%
EPSS 50.44%
CVSS v3.1 7.8
Mentions 4
Last Seen Apr 15, 2019

CNA Information

CNA Assigner
microsoft

Analyst Note

Auto-imported from Google Project Zero — confirmed zero-day by definition.

Triage Info

Decided atMar 05, 2026
Published DateNov 14, 2018