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CVE-2021-31187: Windows WalletService Elevation of Privilege Vulnerability

• Severity: high (CVSS 7.2 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% 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-59

Description

Windows WalletService Elevation of Privilege Vulnerability

Affected products

• Microsoft Windows 10 Version 1607: 20h2, 1607, 1803, 1809, 1909, 2004
• Microsoft Windows 10 Version 1507: from 10.0.0 before 10.0.10240.18931 — fixed in 10.0.10240.18931
• Microsoft Windows 10 1607: from 10.0.0 before 10.0.14393.4401 — fixed in 10.0.14393.4401
• Microsoft Windows 10 1803: from 10.0.0 before 10.0.17134.2207 — fixed in 10.0.17134.2207
• Microsoft Windows 10: from 10.0.0 before 10.0.17763.1935 — fixed in 10.0.17763.1935
• Microsoft Windows 10 1909: from 10.0.0 before 10.0.18363.1556 — fixed in 10.0.18363.1556
• 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

How to fix

Upgrade to a fixed version: Microsoft Windows 10 Version 1507 10.0.10240.18931; Microsoft Windows 10 1607 10.0.14393.4401; Microsoft Windows 10 1803 10.0.17134.2207; Microsoft Windows 10 10.0.17763.1935; Microsoft Windows 10 1909 10.0.18363.1556; Microsoft Windows 10 2004 10.0.19041.982; Microsoft Windows 10 20H2 10.0.19042.982. Check the vendor advisory for mitigations.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31187
• https://www.zerodayinitiative.com/advisories/ZDI-21-571/
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31187
• https://www.zerodayinitiative.com/advisories/ZDI-21-571/

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