What’s Vulnerable › Vulnerabilities

CVE-2021-26414: Windows DCOM Server Security Feature Bypass

• Severity: medium (CVSS 4.3 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 49.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-06-08 · updated 2026-06-17

Description

Windows DCOM Server Security Feature Bypass

Affected products

• Microsoft Windows 10 Version 1607: 20h2, 21h1, 21h2, 1809, 1909, 2004
• Microsoft Windows 7: all versions
• Microsoft Windows 8.1: all versions
• Microsoft Windows RT 8.1: all versions
• Microsoft Windows Server: 20h2, 2004
• Microsoft Windows Server 2008: r2-sp1
• Microsoft Windows Server 2012: r2
• Microsoft Windows Server 2016: all versions
• Microsoft Windows Server 2019: all versions
• Microsoft Windows Server 2022: all versions
• Microsoft Windows 10 Version 1507: from 10.0.0 before 10.0.10240.19802 — fixed in 10.0.10240.19802
• Microsoft Windows 10 1607: from 10.0.0 before 10.0.14393.5786 — fixed in 10.0.14393.5786
• Microsoft Windows 10: from 10.0.0 before 10.0.17763.4131 — fixed in 10.0.17763.4131
• Microsoft Windows 10 1909: from 10.0.0 before 10.0.18363.2344 — fixed in 10.0.18363.2344
• Microsoft Windows 10 20H2: from 10.0.0 before 10.0.19042.2728 — fixed in 10.0.19042.2728
• Microsoft Windows 10 21H1: from 10.0.0 before 10.0.19043.1766 — fixed in 10.0.19043.1766
• Microsoft Windows 10: from 10.0.0 before 10.0.19044.2728 — fixed in 10.0.19044.2728
• Microsoft Windows 11 21H2: from 10.0.0 before 10.0.22000.1696 — fixed in 10.0.22000.1696
• Microsoft Windows 7: from 6.1.0 before 6.1.7601.25984 — fixed in 6.1.7601.25984
• Microsoft Windows 7 Service Pack 1: from 6.1.0 before 6.1.7601.25984 — fixed in 6.1.7601.25984
• Microsoft Windows 8.1: from 6.3.0 before 6.3.9600.20402 — fixed in 6.3.9600.20402
• Microsoft Windows Server 2008 R2 Service Pack 1: from 6.1.0 before 6.1.7601.26415 — fixed in 6.1.7601.26415
• Microsoft Windows Server 2008 Service Pack 2: from 6.0.0 before 6.0.6003.21966 — fixed in 6.0.6003.21966
• Microsoft Windows Server 2012: from 6.2.0 before 6.2.9200.24168 — fixed in 6.2.9200.24168
• Microsoft Windows Server 2012 R2: from 6.3.0 before 6.3.9600.20865 — fixed in 6.3.9600.20865
• Microsoft Windows Server 2016: from 10.0.0 before 10.0.14393.5786 — fixed in 10.0.14393.5786
• Microsoft Windows Server 2019: from 10.0.0 before 10.0.17763.4131 — fixed in 10.0.17763.4131
• Microsoft Windows Server 2022: from 10.0.0 before 10.0.20348.1607 — fixed in 10.0.20348.1607

How to fix

Upgrade to a fixed version: Microsoft Windows 10 Version 1507 10.0.10240.19802; Microsoft Windows 10 1607 10.0.14393.5786; Microsoft Windows 10 10.0.17763.4131; Microsoft Windows 10 1909 10.0.18363.2344; Microsoft Windows 10 20H2 10.0.19042.2728; Microsoft Windows 10 21H1 10.0.19043.1766; Microsoft Windows 10 10.0.19044.2728; Microsoft Windows 11 21H2 10.0.22000.1696; Microsoft Windows 7 6.1.7601.25984; Microsoft Windows 7 Service Pack 1 6.1.7601.25984; Microsoft Windows 8.1 6.3.9600.20402; Microsoft Windows Server 2008 R2 Service Pack 1 6.1.7601.26415. Check the vendor advisory for mitigations.

References

• http://packetstormsecurity.com/files/163206/Windows-Kerberos-AppContainer-Enterprise-Authentication-Capability-Bypass.html
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26414
• http://packetstormsecurity.com/files/163206/Windows-Kerberos-AppContainer-Enterprise-Authentication-Capability-Bypass.html
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26414

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