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CVE-2025-21173: .NET Elevation of Privilege Vulnerability

• Severity: high (CVSS 7.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-01-14 · updated 2026-06-17
• Weakness: CWE-379

Description

.NET Elevation of Privilege Vulnerability

Affected products

• Microsoft .NET: 8.0.0, 9.0.0
• Microsoft Visual Studio 2022 version 17.14: from 17.6.0 before 17.6.22; from 17.8.0 before 17.8.17; from 17.10.0 before 17.10.10; from 17.12.0 before 17.12.4 — fixed in 17.10.10, 17.12.4, 17.6.22, 17.8.17
• Microsoft .NET 8.0: from 8.0.0 before 8.0.12 — fixed in 8.0.12
• Microsoft .NET 9.0: from 9.0.0 before 9.0.1 — fixed in 9.0.1
• Microsoft Visual Studio 2022 version 17.10: from 17.10.0 before 17.10.10 — fixed in 17.10.10
• Microsoft Visual Studio 2022 version 17.6: from 17.6.0 before 17.6.22 — fixed in 17.6.22
• Microsoft Visual Studio 2022 version 17.8: from 17.8.0 before 17.8.17 — fixed in 17.8.17
• Microsoft Visual Studio 2022 version 17.14: from 17.12.0 before 17.12.4 — fixed in 17.12.4

How to fix

Upgrade to a fixed version: Microsoft Visual Studio 2022 version 17.14 17.10.10, 17.12.4, 17.6.22, 17.8.17; Microsoft .NET 8.0 8.0.12; Microsoft .NET 9.0 9.0.1; Microsoft Visual Studio 2022 version 17.10 17.10.10; Microsoft Visual Studio 2022 version 17.6 17.6.22; Microsoft Visual Studio 2022 version 17.8 17.8.17; Microsoft Visual Studio 2022 version 17.14 17.12.4. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21173
• https://www.herodevs.com/vulnerability-directory/cve-2025-21173

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