What’s Vulnerable › Vulnerabilities

CVE-2021-41378: Windows NTFS Remote Code Execution Vulnerability

• Severity: medium (CVSS 6.5 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-11-10 · updated 2026-08-19

Description

Windows NTFS Remote Code Execution Vulnerability

Affected products

• Microsoft Windows 10 Version 1607: 20h2, 21h1, 1809, 1909, 2004
• Microsoft Windows 11 version 21H2: all versions
• Microsoft Windows Server 2016: 20h2, 2004
• Microsoft Windows Server 2019: all versions
• Microsoft Windows Server 2022: all versions
• Microsoft Windows 10: from 10.0.17763.0 before 10.0.17763.2300 — fixed in 10.0.17763.2300
• Microsoft Windows 10 1909: from 10.0.0 before 10.0.18363.1916 — fixed in 10.0.18363.1916
• Microsoft Windows 10 2004: from 10.0.0 before 10.0.19041.1348 — fixed in 10.0.19041.1348
• Microsoft Windows 10 20H2: from 10.0.0 before 10.0.19042.1348 — fixed in 10.0.19042.1348
• Microsoft Windows 10 21H1: from 10.0.0 before 10.0.19043.1348 — fixed in 10.0.19043.1348
• Microsoft Windows 11 21H2: from 10.0.22000.0 before 10.0.22000.318 — fixed in 10.0.22000.318
• Microsoft Windows Server 2019: from 10.0.17763.0 before 10.0.17763.2300 — fixed in 10.0.17763.2300
• Microsoft Windows Server 2022: from 10.0.20348.0 before 10.0.20348.350 — fixed in 10.0.20348.350
• Microsoft Windows Server version 2004: from 10.0.0 before 10.0.19041.1348 — fixed in 10.0.19041.1348
• Microsoft Windows Server version 20H2: from 10.0.0 before 10.0.19041.1348 — fixed in 10.0.19041.1348

How to fix

Upgrade to a fixed version: Microsoft Windows 10 10.0.17763.2300; Microsoft Windows 10 1909 10.0.18363.1916; Microsoft Windows 10 2004 10.0.19041.1348; Microsoft Windows 10 20H2 10.0.19042.1348; Microsoft Windows 10 21H1 10.0.19043.1348; Microsoft Windows 11 21H2 10.0.22000.318; Microsoft Windows Server 2019 10.0.17763.2300; Microsoft Windows Server 2022 10.0.20348.350; Microsoft Windows Server version 2004 10.0.19041.1348; Microsoft Windows Server version 20H2 10.0.19041.1348. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-41378
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-41378

Get alerted when CVE-2021-41378 or the next vulnerability affects your stack