HIGHCVSS v3.1 7.8Actively exploited · CISA KEV since 2021-11-17Vulnerability

CVE-2021-40449

Unspecified vulnerability allows for an authenticated user to escalate privileges.

Properties

Euvd product
Windows 10 Version 20H2, Windows Server 2008 Service Pack 2, Windows 11 version 21H2, Windows 10 Version 1809, Windows 10 Version 1507, Windows Server 2008 R2 Service Pack 1 (Server Core installation), Windows 8.1, Windows Server 2012 (Server Core installation), Windows Server 2012 R2 (Server Core installation), Windows 7 Service Pack 1, Windows Server 2019 (Server Core installation), Windows 10 Version 21H1, Windows Server 2012 R2, Windows Server version 2004, Windows Server 2016 (Server Core installation), Windows 10 Version 1607, Windows Server 2019, Windows Server 2008 R2 Service Pack 1, Windows Server 2022, Windows 7, Windows Server version 20H2, Windows Server 2008 Service Pack 2 (Server Core installation), Windows Server 2012, Windows 10 Version 1909, Windows 10 Version 2004
Vulnerability name
Microsoft Windows Win32k Privilege Escalation Vulnerability
First seen
2025-10-21T23:25:29+00:00
Cvss score
7.8
Epss score
0.81936
Last seen
2026-10-19T12:00:27+00:00
Due date
2021-12-01
Euvd assigner
microsoft
Retrieved at
2026-10-21T01:24:47+00:00
Exploited euvd since
2021-11-17T00:00:00+00:00
Src batch id
epss_history-20261020T103617Z-728ddd
Source url
https://epss.empiricalsecurity.com/epss_scores-2026-10-19.csv.gz
Date added
2021-11-17
Score
7.8
Euvd base score version
3.1
Fetched at
2026-10-20T10:36:20+00:00
Euvd vendor
Microsoft
Cvss vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
In Signal since
initial import (Sep 2026)
Euvd base score
7.8

Related Entities (24 · showing 23)

AFFECTS_PRODUCT (21 · showing 20)

→[Product]cpe:2.3:o:microsoft:windows_server_2004:*:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_8.1:-:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_server_20h2:*:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_10_20h2:*:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_7:-:sp1:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_10_21h1:*:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:*
→[Product]cpe:2.3:o:microsoft:windows_11_21h2:*:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_rt_8.1:-:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_11:*:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_10_1909:*:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_10_2004:*:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*

DESCRIBES (1)

←[KEVEntry]Microsoft Windows Win32k Privilege Escalation Vulnerability

HAS_WEAKNESS (1)

→[Weakness]Use After Free

INVOLVES (1)

←[Signal]kev_added · 2021-11-17

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CVE-2021-40449 (CVSS v3.1 7.8) — Ninja Signal Threat Intelligence | Ninja Signal