Remote Denial of Service Vulnerability in Microsoft.Native.Quic.MsQuic.Schannel
Impact
The MsQuic server application or process will crash, resulting in a denial of service.
Patches
The following patch was made:
- Don't Allow Version Negotiation Packets for Server Connections - https://github.com/microsoft/msquic/commit/3226cff07d22662f16fc98d605656860e64cd343
Workarounds
Beyond upgrading to the patched versions, there is no other workaround. You must upgrade or disable MsQuic functionality.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| .NET (NuGet) | Microsoft.Native.Quic.MsQuic.OpenSSL | < 2.2.3 | 2.2.3 |
| .NET (NuGet) | Microsoft.Native.Quic.MsQuic.Schannel | < 2.2.3 | 2.2.3 |
References
- https://github.com/microsoft/msquic/security/advisories/GHSA-xh5m-8qqp-c5x7
- https://nvd.nist.gov/vuln/detail/CVE-2023-38171
- https://github.com/microsoft/msquic/commit/3226cff07d22662f16fc98d605656860e64cd343
- https://github.com/microsoft/msquic
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-38171
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- Weakness (CWE)
CWE-400, CWE-476- Platform
- .NET (NuGet)
- Package
Microsoft.Native.Quic.MsQuic.OpenSSL, Microsoft.Native.Quic.MsQuic.Schannel- Disclosed
- 10.10.2023
- Updated
- 11.10.2026 11:23
Sources and licenses
OSV / GitHub Advisory Database - GHSA-xh5m-8qqp-c5x7 - CC BY 4.0
Vulnerability history: Microsoft.Native.Quic.MsQuic.OpenSSL
All published vulnerabilities of this package (.NET (NuGet)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 6
- First → latest
- 10.2023 10.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 3
- High 3
Disclosures per year
- 2023: 2
- 2024: 1
- 2025: 0
- 2026: 3
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Remote Denial of Service Vulnerability in Microsoft.Native.Quic.MsQuic.Schannel this entry
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