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CVE-2021-31190: Windows Container Isolation FS Filter Driver Elevation of Privilege Vulnerability

• Severity: medium (CVSS 4.6 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-05-11 · updated 2026-06-17

Description

Windows Container Isolation FS Filter Driver Elevation of Privilege Vulnerability

Affected products

• Microsoft Windows 10 Version 1607: 1809
• Microsoft Windows Server 2019: all versions
• Microsoft Windows 10: from 10.0.0 before 10.0.17763.1935 — fixed in 10.0.17763.1935
• Microsoft Windows Server 2019: from 10.0.0 before 10.0.17763.1935 — fixed in 10.0.17763.1935

How to fix

Upgrade to a fixed version: Microsoft Windows 10 10.0.17763.1935; Microsoft Windows Server 2019 10.0.17763.1935. Check the vendor advisory for mitigations.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31190
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31190

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