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CVE-2021-36938: Windows Cryptographic Primitives Library Information Disclosure Vulnerability

• Severity: low (CVSS 2.1 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-08-12 · updated 2026-08-10

Description

Windows Cryptographic Primitives Library Information Disclosure Vulnerability

Affected products

• Microsoft Windows 10 Version 1607: 1607, 1809
• Microsoft Windows Server 2016: all versions
• Microsoft Windows Server 2019: all versions
• Microsoft Windows 10 Version 1507: from 10.0.10240.0 before 10.0.10240.19022 — fixed in 10.0.10240.19022
• Microsoft Windows 10 1607: from 10.0.14393.0 before 10.0.14393.4583 — fixed in 10.0.14393.4583
• Microsoft Windows 10: from 10.0.17763.0 before 10.0.17763.2114 — fixed in 10.0.17763.2114
• Microsoft Windows Server 2016: from 10.0.14393.0 before 10.0.14393.4583 — fixed in 10.0.14393.4583
• Microsoft Windows Server 2019: from 10.0.17763.0 before 10.0.17763.2114 — fixed in 10.0.17763.2114

How to fix

Upgrade to a fixed version: Microsoft Windows 10 Version 1507 10.0.10240.19022; Microsoft Windows 10 1607 10.0.14393.4583; Microsoft Windows 10 10.0.17763.2114; Microsoft Windows Server 2016 10.0.14393.4583; Microsoft Windows Server 2019 10.0.17763.2114. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-36938
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-36938

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