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CVE-2020-17103: Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability

• Severity: high (CVSS 7.2 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 23.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-12-09 · updated 2026-06-17
• Weakness: CWE-269

Description

Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability

Affected products

• Microsoft Windows 10 Version 1607: 20h2, 1803, 1809, 1903, 1909, 2004
• Microsoft Windows Server 2016: 20h2, 1903, 1909, 2004
• Microsoft Windows Server 2019: all versions
• Microsoft Windows 10: from 10.0.17763.0 before 10.0.17763.8880 — fixed in 10.0.17763.8880
• Microsoft Windows 11: from 10.0.22631.0 before 10.0.22631.7219 — fixed in 10.0.22631.7219
• Microsoft Windows 11: from 10.0.26100.0 before 10.0.26100.8655 — fixed in 10.0.26100.8655
• Microsoft Windows 11 25H2: from 10.0.26200.0 before 10.0.26200.8655 — fixed in 10.0.26200.8655
• Microsoft Windows 11 version 26H1: from 10.0.28000.0 before 10.0.28000.2269 — fixed in 10.0.28000.2269
• Microsoft Windows Server 2019: from 10.0.17763.0 before 10.0.17763.8880 — fixed in 10.0.17763.8880
• Microsoft Windows Server 2025: from 10.0.26100.0 before 10.0.26100.32995 — fixed in 10.0.26100.32995

How to fix

Upgrade to a fixed version: Microsoft Windows 10 10.0.17763.8880; Microsoft Windows 11 10.0.22631.7219; Microsoft Windows 11 10.0.26100.8655; Microsoft Windows 11 25H2 10.0.26200.8655; Microsoft Windows 11 version 26H1 10.0.28000.2269; Microsoft Windows Server 2019 10.0.17763.8880; Microsoft Windows Server 2025 10.0.26100.32995. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-17103
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-17103

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