CVE-2021-1721: Microsoft .net

Medium severity, CVSS 6.5. EPSS: 3.3% chance of exploitation in the next 30 days.

.NET Core and Visual Studio Denial of Service Vulnerability

Affected products

• Microsoft .net: from 5.0, up to and including 5.0.2
• Microsoft .net Core: from 2.1, up to and including 2.1.24; from 3.1, up to and including 3.1.11
• Microsoft PowerShell Core: version 7.0 only; version 7.1 only
• Microsoft Visual Studio 2017: from 15.0, up to and including 15.9
• Microsoft Visual Studio 2019: from 16.0, up to and including 16.8

Published 2021-02-25. Last modified 2026-06-17.