How severe is CVE-2024-21338?

CVE-2024-21338 has a CVSS 3.1 base score of 7.8 (HIGH). EPSS estimates a 59.8% probability of exploitation in the next 30 days. It is listed in the CISA Known Exploited Vulnerabilities catalog.

CVE-2024-21338: Windows Kernel Elevation of Privilege

CISA Known Exploited Vulnerabilities

Microsoft Windows Kernel Exposed IOCTL with Insufficient Access Control Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.

Added to KEV

2024-03-04

Remediation due

2024-03-25

Ransomware

Known use

Required action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

CISA notes
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21338; https://nvd.nist.gov/vuln/detail/CVE-2024-21338

Description

Windows Kernel Elevation of Privilege Vulnerability

Severity

CVSS 3.1 · CNA7.8 HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C

SSVC · CISA-ADP

Exploitationactive

Automatableno

Technical impacttotal

Affected Products

Vendor	Product	Affected versions
Microsoft	Windows 10 Version 1809	10.0.17763.0 to <10.0.17763.5458
Microsoft	Windows 10 Version 1809	10.0.0 to <10.0.17763.5458
Microsoft	Windows 10 Version 21H2	10.0.19043.0 to <10.0.19044.4046
Microsoft	Windows 10 Version 22H2	10.0.19045.0 to <10.0.19045.4046
Microsoft	Windows 11 version 21H2	10.0.0 to <10.0.22000.2777
Microsoft	Windows 11 version 22H2	10.0.22621.0 to <10.0.22621.3155
Microsoft	Windows 11 version 22H3	10.0.22631.0 to <10.0.22631.3155
Microsoft	Windows 11 Version 23H2	10.0.22631.0 to <10.0.22631.3155
Microsoft	Windows Server 2019	10.0.17763.0 to <10.0.17763.5458
Microsoft	Windows Server 2019 (Server Core installation)	10.0.17763.0 to <10.0.17763.5458
Microsoft	Windows Server 2022	10.0.20348.0 to <10.0.20348.2322
Microsoft	Windows Server 2022, 23H2 Edition (Server Core installation)	10.0.25398.0 to <10.0.25398.709

References

4 Links

Vendor advisories

Windows Kernel Elevation of Privilege Vulnerability

Other references

Record Details

Published

2024-02-13

Last updated

2026-08-10

Assigner (CNA)

microsoft

Credited to

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Related Tool Categories

Tool categories that test for or protect against this vulnerability class.

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CVE record data © The MITRE Corporation, used under the CVE Terms of Use. Exploited-in-the-wild data from the CISA Known Exploited Vulnerabilities catalog (CC0). Exploit prediction scores by FIRST EPSS (first.org/epss). This site is not endorsed or certified by MITRE, NVD, CISA, or FIRST.