CVE-2021-40450 kev in the critical feed json
Win32k Elevation of Privilege Vulnerability
published 2021-10-13 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-27627
- cvss
- 7.8
- version 3.1, CNA
- cisa kev
- Exploited
- added 2022-04-25
- epss
- 1.5%
- EPSS 1.5% chance of exploitation in 30 days, percentile 74%
- public exploits
- 0
- none known
Summary
Win32k Elevation of Privilege Vulnerability
Patch / fix
cisa required action Apply updates per vendor instructions.
- Microsoft Windows 10 Version 1809 10.0.17763.2237
- Microsoft Windows Server 2019 10.0.17763.2237
- Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.2237
- Microsoft Windows 10 Version 1909 10.0.18363.1854
- Microsoft Windows 10 Version 21H1 10.0.19043.1288
- Microsoft Windows Server 2022 10.0.20348.288
- Microsoft Windows 10 Version 2004 10.0.19041.1288
- Microsoft Windows Server version 2004 10.0.19041.1288
- Microsoft Windows 10 Version 20H2 10.0.19042.1288
- Microsoft Windows Server version 20H2 10.0.19042.1288
- Microsoft Windows 11 version 21H2 10.0.22000.258
Timeline
- Published
- Added to CISA KEV
- CISA patch deadline
- CISA SSVC: exploitation active
Known exploited
- Added
- 4 y ago
- Patch by
- 2022-05-16 (4 y ago)
- Ransomware
- Not known
- Required action
- Apply updates per vendor instructions.
- Vendor, product
- Microsoft, Win32k
- CISA name
- Microsoft Win32k Privilege Escalation Vulnerability
CISA SSVC
- Exploitation
- Active, exploited in the wild
- Automatable
- no
- Technical impact
- total
- Assessed
- 21 mo ago
Exploit prediction
1.52% chance of exploitation in the next 30 days, higher than 74% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C |
| CNA | 3.1 | 7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 4.6 | AV:L/AC:L/Au:N/C:P/I:P/A:P |
Affected products
- Microsoft Windows 10 Version 1809
- Microsoft Windows Server 2019
- Microsoft Windows Server 2019 (Server Core installation)
- Microsoft Windows 10 Version 1909
- Microsoft Windows 10 Version 21H1
- Microsoft Windows Server 2022
- Microsoft Windows 10 Version 2004
- Microsoft Windows Server version 2004
- Microsoft Windows 10 Version 20H2
- Microsoft Windows Server version 20H2
- Microsoft Windows 11 version 21H2
References
-
portal.msrc.microsoft.com
/en-US/security-guidance/advisory/CVE-2021-40450
patch, vendor-advisory
-
cisa.gov
/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-40450
government-resource, us-government-resource
Sources
- CVE List CVE-2021-40450
- NVD CVE-2021-40450
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