CVE-2024-21338
Published 2024-02-13 · Updated 2026-08-10 · Source secure@microsoft.com
Summary
CVE-2024-21338 is a high-severity (CVSS 7.8) vulnerability in Microsoft Windows. CISA added it to the Known Exploited Vulnerabilities catalog on March 4, 2024, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by March 25, 2024. CISA also lists it as known to be used in ransomware campaigns, so it should be prioritised accordingly. Microsoft has 390 vulnerabilities in the KEV catalog, 117 of them linked to ransomware.
All 390 known-exploited Microsoft vulnerabilities →Description
Windows Kernel Elevation of Privilege Vulnerability
CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CISA Known-Exploited Vulnerability
Product: Microsoft — Windows
Name: Microsoft Windows Kernel Exposed IOCTL with Insufficient Access Control Vulnerability
Date added: 2024-03-04 · Due: 2024-03-25
Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21338
- https://decoded.avast.io/janvojtesek/lazarus-and-the-fudmodule-rootkit-beyond-byovd-with-an-admin-to-kernel-zero-day/
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21338
- https://packetstorm.news/files/id/190586/
- https://www.exploit-db.com/exploits/52275
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-21338