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CVE-2022-26937: Windows Network File System Remote Code Execution Vulnerability

• Severity: high (CVSS 7.5 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 76.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-05-10 · updated 2026-06-17

Description

Windows Network File System Remote Code Execution Vulnerability

Affected products

• Microsoft Windows Server: 20h2
• Microsoft Windows Server 2008: r2-sp1, sp2
• 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 Server 2008 R2 Service Pack 1: from 6.1.7601.0 before 6.1.7601.25954 — fixed in 6.1.7601.25954
• Microsoft Windows Server 2008 Service Pack 2: from 6.0.6003.0 before 6.0.6003.21481 — fixed in 6.0.6003.21481
• Microsoft Windows Server 2012: from 6.2.9200.0 before 6.2.9200.23714 — fixed in 6.2.9200.23714
• Microsoft Windows Server 2012 R2: from 6.3.9600.0 before 6.3.9600.20371 — fixed in 6.3.9600.20371
• Microsoft Windows Server 2016: from 10.0.14393.0 before 10.0.14393.5125 — fixed in 10.0.14393.5125
• Microsoft Windows Server 2019: from 10.0.17763.0 before 10.0.17763.2928 — fixed in 10.0.17763.2928
• Microsoft Windows Server 2022: from 10.0.20348.0 before 10.0.20348.707 — fixed in 10.0.20348.707
• Microsoft Windows Server version 20H2: from 10.0.0 before 10.0.19042.1706 — fixed in 10.0.19042.1706

How to fix

Upgrade to a fixed version: Microsoft Windows Server 2008 R2 Service Pack 1 6.1.7601.25954; Microsoft Windows Server 2008 Service Pack 2 6.0.6003.21481; Microsoft Windows Server 2012 6.2.9200.23714; Microsoft Windows Server 2012 R2 6.3.9600.20371; Microsoft Windows Server 2016 10.0.14393.5125; Microsoft Windows Server 2019 10.0.17763.2928; Microsoft Windows Server 2022 10.0.20348.707; Microsoft Windows Server version 20H2 10.0.19042.1706. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2022-26937
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2022-26937

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