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CVE-2021-34477: Visual Studio Code .NET Runtime 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: 2021-07-14 · updated 2026-08-10
• Weakness: CWE-269

Description

Visual Studio Code .NET Runtime Elevation of Privilege Vulnerability

Affected products

• Microsoft .NET Education Bundle SDK Install Tool: from 0.6.0 before 0.7.0 — fixed in 0.7.0
• Microsoft .NET Install Tool for Extension Authors: from 1.1.0 before 1.2.0 — fixed in 1.2.0
• Microsoft .NET Education Bundle SDK Install Tool: before 1.2.0 — fixed in 1.2.0
• Microsoft .NET Install Tool for Extension Authors: from 1.0.0 before 0.7.0 — fixed in 0.7.0

How to fix

Upgrade to a fixed version: Microsoft .NET Education Bundle SDK Install Tool 0.7.0; Microsoft .NET Install Tool for Extension Authors 1.2.0; Microsoft .NET Education Bundle SDK Install Tool 1.2.0; Microsoft .NET Install Tool for Extension Authors 0.7.0. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34477
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34477

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