What’s Vulnerable › Vulnerabilities

CVE-2021-40488: Storage Spaces Controller Elevation of Privilege Vulnerability

• Severity: high (CVSS 7.2 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-10-13 · updated 2026-06-17
• Weakness: CWE-269

Description

Storage Spaces Controller Elevation of Privilege Vulnerability

Affected products

• Microsoft Windows 10 Version 1607: 20h2, 21h1, 1607, 1809, 1909, 2004
• Microsoft Windows 11 version 21H2: all versions
• Microsoft Windows 8.1: all versions
• Microsoft Windows RT 8.1: all versions
• Microsoft Windows Server 2012: r2
• Microsoft Windows Server 2016: 20h2, 2004
• Microsoft Windows Server 2019: all versions
• Microsoft Windows Server 2022: all versions
• Microsoft Windows 10 Version 1507: from 10.0.0 before 10.0.10240.19086 — fixed in 10.0.10240.19086
• Microsoft Windows 10 1607: from 10.0.0 before 10.0.14393.4704 — fixed in 10.0.14393.4704
• Microsoft Windows 10: from 10.0.0 before 10.0.17763.2237 — fixed in 10.0.17763.2237
• Microsoft Windows 10 1909: from 10.0.0 before 10.0.18363.1854 — fixed in 10.0.18363.1854
• Microsoft Windows 10 2004: from 10.0.0 before 10.0.19041.1288 — fixed in 10.0.19041.1288
• Microsoft Windows 10 20H2: from 10.0.0 before 10.0.19042.1288 — fixed in 10.0.19042.1288
• Microsoft Windows 10 21H1: from 10.0.0 before 10.0.19043.1288 — fixed in 10.0.19043.1288
• Microsoft Windows 11 21H2: from 10.0.0 before 10.0.22000.258 — fixed in 10.0.22000.258
• Microsoft Windows 8.1: from 6.3.0 before 6.3.9600.20144 — fixed in 6.3.9600.20144
• Microsoft Windows Server 2012: from 6.2.0 before 6.2.9200.23490 — fixed in 6.2.9200.23490
• Microsoft Windows Server 2012 R2: from 6.3.0 before 6.3.9600.20144 — fixed in 6.3.9600.20144
• Microsoft Windows Server 2016: from 10.0.0 before 10.0.14393.4704 — fixed in 10.0.14393.4704
• Microsoft Windows Server 2019: from 10.0.0 before 10.0.17763.2237 — fixed in 10.0.17763.2237
• Microsoft Windows Server 2022: from 10.0.0 before 10.0.20348.288 — fixed in 10.0.20348.288
• Microsoft Windows Server version 2004: from 10.0.0 before 10.0.19041.1288 — fixed in 10.0.19041.1288
• Microsoft Windows Server version 20H2: from 10.0.0 before 10.0.19042.1288 — fixed in 10.0.19042.1288

How to fix

Upgrade to a fixed version: Microsoft Windows 10 Version 1507 10.0.10240.19086; Microsoft Windows 10 1607 10.0.14393.4704; Microsoft Windows 10 10.0.17763.2237; Microsoft Windows 10 1909 10.0.18363.1854; Microsoft Windows 10 2004 10.0.19041.1288; Microsoft Windows 10 20H2 10.0.19042.1288; Microsoft Windows 10 21H1 10.0.19043.1288; Microsoft Windows 11 21H2 10.0.22000.258; Microsoft Windows 8.1 6.3.9600.20144; Microsoft Windows Server 2012 6.2.9200.23490; Microsoft Windows Server 2012 R2 6.3.9600.20144; Microsoft Windows Server 2016 10.0.14393.4704. Check the vendor advisory for mitigations.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-40488
• https://www.zerodayinitiative.com/advisories/ZDI-21-1153/
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-40488
• https://www.zerodayinitiative.com/advisories/ZDI-21-1153/

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