CVE-2018-8639

highpriority · act · 90OT risk · criticalKEV · exploitedEPSS 0.222 · 98 %ileexploit · PoCEURUUS

grimoire priorityP0 · Act now

Exploitable?

Yes · in the wild

CISA KEV · 2 exploits · PoC

Likely / severe?

22.2% (98th) EPSS

CVSS 7.2 · high

Is it mine?

70 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · fstec_bdu

added 2025-03-03remediate by 2025-03-24

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.

EPSS · scored 2026-10-26

Microsoft Windows Win32k Improper Resource Shutdown or Release Vulnerability

An elevation of privilege vulnerability exists in Windows when the Win32k component fails to properly handle objects in memory, aka "Win32k Elevation of Privilege Vulnerability." This affects Windows 7, Windows Server 2012 R2, Windows RT 8.1, Windows Server 2008, Windows Server 2019, Windows Server 2012, Windows 8.1, Windows Server 2016, Windows Server 2008 R2, Windows 10, Windows 10 Servers. This CVE ID is unique from CVE-2018-8641.

cvss

Technical severity, 0–10. One row per scoring source.

8.4

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.07.2highAV:L/AC:L/Au:N/C:C/I:C/A:Cprimary · NVD / NIST USexploitability 3.9 · impact 10

v3.17.8highCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 1.8 · impact 5.9

v3.17highAV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.18.4highCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · ENISA EU

v3.18.4highCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondaryexploitability 2.5 · impact 5.9

v3.17.8highCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:Hsecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: active · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-404USprimaryCWE-119USCWE-269US

exploits (2)

Public proof-of-concept and weaponised exploit code.

timwhitez/CVE-2018-8639-EXPCVE-2018-8639-EXPPoC · poc_in_github
ze0r/CVE-2018-8639-expze0r/CVE-2018-8639-expPoC · poc_in_github

affected products (70)

Products and version ranges known to be affected.

Microsoft Windows 10≤ Version 1703 for x64-based Systemsenisa_euvdEU
Microsoft Windows 10≤ 32-bit Systemsenisa_euvdEU
Microsoft Windows 10≤ Version 1809 for 32-bit Systemsenisa_euvdEU
Microsoft Windows 10≤ Version 1809 for ARM64-based Systemsenisa_euvdEU
Microsoft Windows 10≤ Version 1709 for 32-bit Systemsenisa_euvdEU
Microsoft Windows 10≤ Version 1803 for ARM64-based Systemsenisa_euvdEU
Microsoft Windows 10≤ Version 1809 for x64-based Systemsenisa_euvdEU
Microsoft Windows 10≤ Version 1709 for ARM64-based Systemsenisa_euvdEU
Microsoft Windows 10≤ Version 1803 for 32-bit Systemsenisa_euvdEU
Microsoft Windows 10≤ Version 1703 for 32-bit Systemsenisa_euvdEU
Microsoft Windows 10≤ x64-based Systemsenisa_euvdEU
Microsoft Windows 10≤ Version 1803 for x64-based Systemsenisa_euvdEU
Microsoft Windows 10≤ Version 1607 for x64-based Systemsenisa_euvdEU
Microsoft Windows 10≤ Version 1709 for x64-based Systemsenisa_euvdEU
Microsoft Windows 10≤ Version 1607 for 32-bit Systemsenisa_euvdEU
Microsoft Windows 10 Servers≤ version 1803 (Server Core Installation)enisa_euvdEU
Microsoft Windows 10 Servers≤ version 1709 (Server Core Installation)enisa_euvdEU
Microsoft Windows 7≤ x64-based Systems Service Pack 1enisa_euvdEU
Microsoft Windows 7≤ 32-bit Systems Service Pack 1enisa_euvdEU
Microsoft Windows 8.1≤ 32-bit systemsenisa_euvdEU

showing 20 of 70

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu NVD CVE.org MITRE

published 2018-12-12modified 2026-06-17

related (2,015)

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ID	severity	EPSS	exploitable	published
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CVE-2018-8611US	high7.8OT critical	4.20% (91st)	KEV	2018-12-12
An elevation of privilege vulnerability exists when the Windows kernel fails to properly handle objects in memory, aka "Windows Kernel Elevation of Privilege Vulnerability." This a…
CVE-2018-8406US	high7.8OT critical	3.44% (89th)	KEV	2018-08-15
An elevation of privilege vulnerability exists when the DirectX Graphics Kernel (DXGKRNL) driver improperly handles objects in memory, aka "DirectX Graphics Kernel Elevation of Pri…
CVE-2018-8405US	high7.8OT critical	3.44% (89th)	KEV	2018-08-15
An elevation of privilege vulnerability exists when the DirectX Graphics Kernel (DXGKRNL) driver improperly handles objects in memory, aka "DirectX Graphics Kernel Elevation of Pri…
CVE-2018-8120US	high7.0OT critical	73.3% (99th)	KEV	2018-05-09
An elevation of privilege vulnerability exists in Windows when the Win32k component fails to properly handle objects in memory, aka "Win32k Elevation of Privilege Vulnerability." T…

+2010 more

references (9)

External citations — patches, advisories, analysis.

scry

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