CVE-2024-21338
High 7.8 Exploited in the wild (KEV) Used in ransomware campaigns
Confirmed active exploitation — CISA KEV catalog
- Name
- Microsoft Windows Kernel Exposed IOCTL with Insufficient Access Control Vulnerability
- Added to catalog
- Remediation due date (US federal)
- Required action
- Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Description
Windows Kernel Elevation of Privilege Vulnerability
Metrics
- CVSS 3.1
-
7.8 (HIGH)
Score source: CNA
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 60% (percentile: 99) as of 2 November 2026
- CWE
- CWE-822
Affected products
microsoft: windows 10 1809; microsoft: windows 10 21h2; microsoft: windows 10 22h2; microsoft: windows 11 21h2; microsoft: windows 11 22h2; microsoft: windows 11 23h2; microsoft: windows server 2019; microsoft: windows server 2022; microsoft: windows server 2022 23h2
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21338 PatchVendor Advisory
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21338 PatchVendor Advisory
- https://decoded.avast.io/janvojtesek/lazarus-and-the-fudmodule-rootkit-beyond-b… ExploitTechnical DescriptionThird Party Advisory
- https://packetstorm.news/files/id/190586/ ExploitVDB Entry
- https://www.exploit-db.com/exploits/52275 ExploitVDB Entry
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024… US Government Resource