What’s Vulnerable › Vulnerabilities
CVE-2020-1556: Windows WalletService Elevation of Privilege Vulnerability
- Severity: high (CVSS 7.8 v3.1)
- 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: 2020-08-17 · updated 2026-06-17
Description
An elevation of privilege vulnerability exists in the way that the Windows WalletService handles objects in memory. An attacker who successfully exploited the vulnerability could execute code with elevated permissions. To exploit the vulnerability, a locally authenticated attacker could run a specially crafted application. The security update addresses the vulnerability by ensuring the Windows WalletService properly handles objects in memory.
Affected products
- Microsoft Windows 10 Version 1607: 1607, 1709, 1803, 1809, 1903, 1909 (+1)
- Microsoft Windows Server 2016: 1903, 1909, 2004
- Microsoft Windows Server 2019: all versions
- Microsoft Windows 10 Version 1507: from 10.0.0 before publication — fixed in publication
- Microsoft Windows 10 1607: from 10.0.0 before publication — fixed in publication
- Microsoft Windows 10 1709: from 10.0.0 before publication — fixed in publication
- Microsoft Windows 10 Version 1709 for 32-bit Systems: from 10.0.0 before publication — fixed in publication
- Microsoft Windows 10 1803: from 10.0.0 before publication — fixed in publication
- Microsoft Windows 10: from 10.0.0 before publication — fixed in publication
- Microsoft Windows 10 Version 1903 for 32-bit Systems: from 10.0.0 before publication — fixed in publication
- Microsoft Windows 10 Version 1903 for ARM64-based Systems: from 10.0.0 before publication — fixed in publication
- Microsoft Windows 10 Version 1903 for x64-based Systems: from 10.0.0 before publication — fixed in publication
- Microsoft Windows 10 1909: from 10.0.0 before publication — fixed in publication
- Microsoft Windows 10 2004: from 10.0.0 before publication — fixed in publication
- Microsoft Windows Server 2016: from 10.0.0 before publication — fixed in publication
- Microsoft Windows Server 2019: from 10.0.0 before publication — fixed in publication
- Microsoft Windows Server, version 1903 (Server Core installation): from 10.0.0 before publication — fixed in publication
- Microsoft Windows Server, version 1909 (Server Core installation): from 10.0.0 before publication — fixed in publication
- Microsoft Windows Server version 2004: from 10.0.0 before publication — fixed in publication
How to fix
Upgrade to a fixed version: Microsoft Windows 10 Version 1507 publication; Microsoft Windows 10 1607 publication; Microsoft Windows 10 1709 publication; Microsoft Windows 10 Version 1709 for 32-bit Systems publication; Microsoft Windows 10 1803 publication; Microsoft Windows 10 publication; Microsoft Windows 10 Version 1903 for 32-bit Systems publication; Microsoft Windows 10 Version 1903 for ARM64-based Systems publication; Microsoft Windows 10 Version 1903 for x64-based Systems publication; Microsoft Windows 10 1909 publication; Microsoft Windows 10 2004 publication; Microsoft Windows Server 2016 publication. Check the vendor advisory for mitigations.
References
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1556
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1556
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