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CVE-2023-28252: Microsoft Windows Common Log File System (CLFS) Driver Privilege Escalation Vulnerability

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2023-04-11
• EPSS: 48.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2023-04-11 · updated 2026-06-17
• Weakness: CWE-122

Description

Windows Common Log File System Driver Elevation of Privilege Vulnerability

Affected products

• Microsoft Windows 10 Version 1507: before 10.0.10240.19869 — fixed in 10.0.10240.19869
• Microsoft Windows 10 1607: before 10.0.14393.5850 — fixed in 10.0.14393.5850
• Microsoft Windows 10: before 10.0.17763.4252 — fixed in 10.0.17763.4252
• Microsoft Windows 10 20H2: before 10.0.19042.2846 — fixed in 10.0.19042.2846
• Microsoft Windows 10: before 10.0.19044.2846 — fixed in 10.0.19044.2846
• Microsoft Windows 10: before 10.0.19045.2846 — fixed in 10.0.19045.2846
• Microsoft Windows 11 21H2: before 10.0.22000.1817 — fixed in 10.0.22000.1817
• Microsoft Windows 11: before 10.0.22621.1555 — fixed in 10.0.22621.1555
• Microsoft Windows Server 2008: r2-sp1
• Microsoft Windows Server 2012: r2
• Microsoft Windows Server 2016: all versions
• Microsoft Windows Server 2019: all versions
• Microsoft Windows Server 2022: all versions

How to fix

Upgrade to a fixed version: Microsoft Windows 10 Version 1507 10.0.10240.19869; Microsoft Windows 10 1607 10.0.14393.5850; Microsoft Windows 10 10.0.17763.4252; Microsoft Windows 10 20H2 10.0.19042.2846; Microsoft Windows 10 10.0.19044.2846; Microsoft Windows 10 10.0.19045.2846; Microsoft Windows 11 21H2 10.0.22000.1817; Microsoft Windows 11 10.0.22621.1555. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-28252
• http://packetstormsecurity.com/files/174668/Windows-Common-Log-File-System-Driver-clfs.sys-Privilege-Escalation.html
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-28252
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-28252

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