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CVE-2021-31165: Windows Container Manager Service Elevation of Privilege Vulnerability

• Severity: medium (CVSS 4.6 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: 2021-05-11 · updated 2026-06-17
• Weakness: CWE-863

Description

Windows Container Manager Service Elevation of Privilege Vulnerability

Affected products

• Microsoft Windows 10 Version 1607: 20h2, 2004
• Microsoft Windows Server 2016: 20h2, 2004
• Microsoft Windows 10 2004: from 10.0.0 before 10.0.19041.982 — fixed in 10.0.19041.982
• Microsoft Windows 10 20H2: from 10.0.0 before 10.0.19042.982 — fixed in 10.0.19042.982
• Microsoft Windows Server version 2004: from 10.0.0 before 10.0.19041.982 — fixed in 10.0.19041.982
• Microsoft Windows Server version 20H2: from 10.0.0 before 10.0.19042.982 — fixed in 10.0.19042.982

How to fix

Upgrade to a fixed version: Microsoft Windows 10 2004 10.0.19041.982; Microsoft Windows 10 20H2 10.0.19042.982; Microsoft Windows Server version 2004 10.0.19041.982; Microsoft Windows Server version 20H2 10.0.19042.982. Check the vendor advisory for mitigations.

References

• http://packetstormsecurity.com/files/162555/Windows-Container-Manager-Service-CmsRpcSrv_CreateContainer-Privilege-Escalation.html
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31165
• http://packetstormsecurity.com/files/162555/Windows-Container-Manager-Service-CmsRpcSrv_CreateContainer-Privilege-Escalation.html
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31165

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