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TI-2021-08637 Aliases CVE-2021-27064GHSA-x544-2j43-9gqx

Visual Studio Installer Elevation of Privilege Vulnerability

Priority LOW 37Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

Visual Studio Installer Elevation of Privilege Vulnerability

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00631 50th percentileScored 2026-11-07
Fix Fixed Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8) (Microsoft): publicationMicrosoft Visual Studio 2019 version 16.4 (includes 16.0 - 16.3) (Microsoft): publication+2 more products

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MicrosoftMicrosoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8)15.9.0 to before publicationpublicationPatch availableCNA
MicrosoftMicrosoft Visual Studio 2019 version 16.4 (includes 16.0 - 16.3)16.0 to before publicationpublicationPatch availableCNA
MicrosoftMicrosoft Visual Studio 2019 version 16.7 (includes 16.0 – 16.6)16.0.0 to before publicationpublicationPatch availableCNA
MicrosoftMicrosoft Visual Studio 2019 version 16.9 (includes 16.0 - 16.8)15.0.0 to before publicationpublicationPatch availableCNA
  • Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8) VendorMicrosoft Affected 15.9.0 to before publication Fixed in publication Patch available CNA
  • Microsoft Visual Studio 2019 version 16.4 (includes 16.0 - 16.3) VendorMicrosoft Affected 16.0 to before publication Fixed in publication Patch available CNA
  • Microsoft Visual Studio 2019 version 16.7 (includes 16.0 – 16.6) VendorMicrosoft Affected 16.0.0 to before publication Fixed in publication Patch available CNA
  • Microsoft Visual Studio 2019 version 16.9 (includes 16.0 - 16.8) VendorMicrosoft Affected 15.0.0 to before publication Fixed in publication Patch available CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:microsoft:visual_studio_2017:*:*:*:*:*:*:*:*15.0 – 15.9VulnerableMicrosoft
cpe:2.3:a:microsoft:visual_studio_2019:*:*:*:*:*:*:*:*16.0 – 16.4; 16.6 – 16.7; 16.8 – 16.9VulnerableMicrosoft
  • cpe:2.3:a:microsoft:visual_studio_2017:*:*:*:*:*:*:*:* Versions 15.0 – 15.9 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:visual_studio_2019:*:*:*:*:*:*:*:* Versions 16.0 – 16.4; 16.6 – 16.7; 16.8 – 16.9 Vulnerable ·Microsoft

Remediation

  • Fix · CNA Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8) (Microsoft) Fixed in publication
  • Fix · CNA Microsoft Visual Studio 2019 version 16.4 (includes 16.0 - 16.3) (Microsoft) Fixed in publication
  • Fix · CNA Microsoft Visual Studio 2019 version 16.7 (includes 16.0 – 16.6) (Microsoft) Fixed in publication
  • Fix · CNA Microsoft Visual Studio 2019 version 16.9 (includes 16.0 - 16.8) (Microsoft) Fixed in publication

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-27064
  2. 2026-10-03 Alias added: GHSA-x544-2j43-9gqx
  3. 2026-11-02 EPSS moved to the 50th–90th percentile

References

Patch 1

  • TI-2020-01112 A remote code execution vulnerability exists in .NET Framework, Microsoft SharePoint, and… KEVCVSS 3.1HIGH 7.8
  • TI-2022-16266 Visual Studio Remote Code Execution Vulnerability CVSS 3.1HIGH 8.8
  • TI-2021-15028 Visual Studio Remote Code Execution Vulnerability CVSS 3.1HIGH 7.8
  • TI-2019-01063 Improper input validation in Microsoft Visual Studio 2017 version 15.9 CVSS 3.1HIGH 8.8
  • TI-2019-01064 Improper input validation in Microsoft Visual Studio 2019 version 16.4 CVSS 3.1HIGH 8.8
  • TI-2019-01066 Improper input validation in Microsoft Visual Studio 2019 version 16.4 CVSS 3.1HIGH 8.8
See all 93 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences