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CVE-2021-27064: Visual Studio Installer Elevation of Privilege Vulnerability

• Severity: medium (CVSS 4.6 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-04-13 · updated 2026-06-17

Description

Visual Studio Installer Elevation of Privilege Vulnerability

Affected products

• Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8): from 15.0 through 15.9
• Microsoft Visual Studio 2019: from 16.0 through 16.4; from 16.6 through 16.7; from 16.8 through 16.9
• Microsoft Visual Studio 2019 version 16.4 (includes 16.0 - 16.3): from 16.0 before publication — fixed in publication
• Microsoft Visual Studio 2019 version 16.7 (includes 16.0 – 16.6): from 16.0.0 before publication — fixed in publication
• Microsoft Visual Studio 2019 version 16.9 (includes 16.0 - 16.8): from 15.0.0 before publication — fixed in publication
• Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8): from 15.9.0 before publication — fixed in publication

How to fix

Upgrade to a fixed version: Microsoft Visual Studio 2019 version 16.4 (includes 16.0 - 16.3) publication; Microsoft Visual Studio 2019 version 16.7 (includes 16.0 – 16.6) publication; Microsoft Visual Studio 2019 version 16.9 (includes 16.0 - 16.8) publication; Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8) publication. Check the vendor advisory for mitigations.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-27064
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-27064

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