Microsoft Windows Kernel Exposed IOCTL with Insufficient Access Control Vulnerability

HIGH 7.8EXPLOITED (CISA KEV)CVE-2024-21338 · Published 13/02/2024 · updated 10/08/2026

Microsoft Windows Kernel Exposed IOCTL with Insufficient Access Control Vulnerability. Actively exploited: CISA added this vulnerability to its Known Exploited Vulnerabilities catalog on 04/03/2024. Patch affected systems as an emergency. It is known to be used in ransomware campaigns.

In short

CVE-2024-21338 is a HIGH (CVSS 7.8) vulnerability.
Exploited in the wild: CISA added it to the KEV catalog on 04/03/2024.
Chance of exploitation in the next 30 days (EPSS): 59.8%, higher than 99.1% of all vulnerabilities.
No patched version is listed yet: follow the vendor's advisory in References.

Package	Affected versions	Patched versions
Windows Microsoft	Versions not published yet (product named by CISA KEV)

Description

Windows Kernel Elevation of Privilege Vulnerability

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21338 · Patch
decoded.avast.io/janvojtesek/lazarus-and-the-fudmodule-rootkit-beyond-byovd-with-an-admin-to-kernel-zero-day · Exploit
packetstorm.news/files/id/190586 · Exploit
exploit-db.com/exploits/52275 · Exploit
cisa.gov/known-exploited-vulnerabilities-catalog · US Government Resource
CISA KEV · CVE-2024-21338

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