CVE-2025-21171: Microsoft .net

High severity, CVSS 7.5. EPSS: 1.7% chance of exploitation in the next 30 days.

.NET Remote Code Execution Vulnerability

Affected products

• Microsoft .net: version 9.0.0 only
• Microsoft PowerShell: version 7.5 only
• Microsoft Visual Studio 2022: from 17.6.0, before 17.6.22 (fixed in 17.6.22); from 17.8.0, before 17.8.17 (fixed in 17.8.17); from 17.10.0, before 17.10.10 (fixed in 17.10.10); from 17.12.0, before 17.12.4 (fixed in 17.12.4)

Published 2025-01-14. Last modified 2026-06-17.