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CVE-2024-21338: Windows Kernel Elevation of Privilege Vulnerability

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2024-03-04
• EPSS: 59.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2024-02-13 · updated 2026-08-10
• Weakness: CWE-822

Description

Windows Kernel Elevation of Privilege Vulnerability

Affected products

• Microsoft Windows 10: before 10.0.17763.5458 — fixed in 10.0.17763.5458
• Microsoft Windows 10: before 10.0.19044.4046 — fixed in 10.0.19044.4046
• Microsoft Windows 10: before 10.0.19045.4046 — fixed in 10.0.19045.4046
• Microsoft Windows 11 21H2: before 10.0.22000.2777 — fixed in 10.0.22000.2777
• Microsoft Windows 11: before 10.0.22621.3155 — fixed in 10.0.22621.3155
• Microsoft Windows 11: before 10.0.22631.3155 — fixed in 10.0.22631.3155
• Microsoft Windows Server 2019: before 10.0.17763.5458 — fixed in 10.0.17763.5458
• Microsoft Windows Server 2022: before 10.0.20348.2322 — fixed in 10.0.20348.2322
• Microsoft Windows Server 2022, 23H2 Edition (Server Core installation): through 10.0.25398.709
• Microsoft Windows 10: from 10.0.17763.0 before 10.0.17763.5458 — fixed in 10.0.17763.5458
• Microsoft Windows 10: from 10.0.19043.0 before 10.0.19044.4046 — fixed in 10.0.19044.4046
• Microsoft Windows 10: from 10.0.19045.0 before 10.0.19045.4046 — fixed in 10.0.19045.4046
• Microsoft Windows 11 21H2: from 10.0.0 before 10.0.22000.2777 — fixed in 10.0.22000.2777
• Microsoft Windows 11: from 10.0.22621.0 before 10.0.22621.3155 — fixed in 10.0.22621.3155
• Microsoft Windows 11 version 22H3: from 10.0.22631.0 before 10.0.22631.3155 — fixed in 10.0.22631.3155
• Microsoft Windows 11: from 10.0.22631.0 before 10.0.22631.3155 — fixed in 10.0.22631.3155
• Microsoft Windows Server 2019: from 10.0.17763.0 before 10.0.17763.5458 — fixed in 10.0.17763.5458
• Microsoft Windows Server 2022: from 10.0.20348.0 before 10.0.20348.2322 — fixed in 10.0.20348.2322
• Microsoft Windows Server 2022, 23H2 Edition (Server Core installation): from 10.0.25398.0 before 10.0.25398.709 — fixed in 10.0.25398.709

How to fix

Upgrade to a fixed version: Microsoft Windows 10 10.0.17763.5458; Microsoft Windows 10 10.0.19044.4046; Microsoft Windows 10 10.0.19045.4046; Microsoft Windows 11 21H2 10.0.22000.2777; Microsoft Windows 11 10.0.22621.3155; Microsoft Windows 11 10.0.22631.3155; Microsoft Windows Server 2019 10.0.17763.5458; Microsoft Windows Server 2022 10.0.20348.2322; Microsoft Windows 10 10.0.17763.5458; Microsoft Windows 10 10.0.19044.4046; Microsoft Windows 10 10.0.19045.4046; Microsoft Windows 11 21H2 10.0.22000.2777. Check the vendor advisory for mitigations.

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

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