CVE-2024-21338
HighExploitedPublic exploitWindows Kernel Elevation of Privilege Vulnerability
Published Feb 16, 2024 · Updated Aug 10, 2026
Key Facts
Patch immediately- CVE-2024-21338 is a high-severity vulnerability (CVSS 7.8 v3.1) affecting Windows 10 1809 (Microsoft), Windows 10 21h2 (Microsoft), Windows 10 22h2 (Microsoft) and 15 more products.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Feb 13, 2024 and is known to be used in ransomware campaigns. Public exploit code is available.
- EPSS estimates a 60% probability of exploitation in the next 30 days.
- Fixed versions are available, including Windows 10 1809 10.0.17763.5458, Windows 10 21h2 10.0.19044.4046, Windows 10 22h2 10.0.19045.4046.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
7.8
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
60%
Higher than 99.1% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings, used by ransomware
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2024-21338 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
Windows Kernel Elevation of Privilege Vulnerability
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Mar 4, 2024 | Mar 25, 2024 | Known |
| Industry KEV feed | Feb 13, 2024 | Mar 25, 2024 | Known |
| CIRCL KEV | Mar 4, 2024 | Mar 25, 2024 | Known |
| ENISA EUVD | Mar 4, 2024 | n/a | Not reported |
Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Affected Products
20 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Windows 10 1809Microsoft | See advisory | 10.0.17763.5458 |
| Windows 10 21h2Microsoft | See advisory | 10.0.19044.4046 |
| Windows 10 22h2Microsoft | See advisory | 10.0.19045.4046 |
| Windows 11 21h2Microsoft | See advisory | 10.0.22000.2777 |
| Windows 11 22h2Microsoft | See advisory | 10.0.22621.3155 |
Patched Releases
Windows 10 1809
10.0.17763.5458
Windows 10 21h2
10.0.19044.4046
Windows 10 22h2
10.0.19045.4046
Windows 11 21h2
10.0.22000.2777
Windows 11 22h2
10.0.22621.3155
Windows 11 23h2
10.0.22631.3155
Windows Server 2019
10.0.17763.5458
Windows Server 2022
10.0.20348.2322
Windows Server 2022 23h2
<=10.0.25398.709
Windows 10 Version 1809
10.0.17763.5458
Windows 10 Version 21H2
10.0.19044.4046
Windows 10 Version 22H2
10.0.19045.4046
Windows 11 version 21H2
10.0.22000.2777
Windows 11 version 22H2
10.0.22621.3155
Windows 11 version 22H3
10.0.22631.3155
Windows 11 Version 23H2
10.0.22631.3155
Windows Server 2019 (Server Core installation)
10.0.17763.5458
Windows Server 2022, 23H2 Edition (Server Core installation)
10.0.25398.709
Timeline
Added to Industry KEV feed
Feb 13, 2024
Publicly disclosed
Feb 16, 2024
Added to CISA KEV
Mar 4, 2024
Added to CIRCL KEV
Mar 4, 2024
Added to ENISA EUVD
Mar 4, 2024
Last updated
Aug 10, 2026
Weakness Type
- CWE-822 Untrusted Pointer Dereference
References
- advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-20673
- advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-20684
- advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21315
- advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21327
- advisoryWindows Kernel Elevation of Privilege Vulnerability
FAQ
Common Questions.
Windows Kernel Elevation of Privilege Vulnerability
Affected: Windows 10 1809 (Microsoft); Windows 10 21h2 (Microsoft); Windows 10 22h2 (Microsoft), among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Feb 13, 2024 and is known to be used in ransomware campaigns.
Yes. It was added on Mar 4, 2024 with a federal remediation due date of Mar 25, 2024.
Public exploit code is available.
Fixed versions are available, including Windows 10 1809 10.0.17763.5458, Windows 10 21h2 10.0.19044.4046, Windows 10 22h2 10.0.19045.4046.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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