CVE-2023-38171
HighRemote Denial of Service Vulnerability in Microsoft.Native.Quic.MsQuic.Schannel
Published Oct 10, 2023 · Updated Sep 8, 2026 · Also known as BIT-dotnet-2023-38171, BIT-dotnet-sdk-2023-38171, GHSA-xh5m-8qqp-c5x7
Key Facts
Patch immediately- CVE-2023-38171 is a high-severity vulnerability (CVSS 7.5 v3.1) affecting .net (Microsoft), Visual Studio 2022 (Microsoft), Windows 11 22h2 (Microsoft) and 15 more products.
- It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
- EPSS estimates a 71% probability of exploitation in the next 30 days.
- Fixed versions are available, including .NET 7.0 7.0.13, dotnet 7.0.12, dotnet-sdk 7.0.12.
- Brandefense priority: patch immediately, because it is very likely to be exploited soon.
CVSS v3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS (30-day exploit likelihood)
71%
Higher than 99.4% of all scored CVEs
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
None known
Get the full CVE-2023-38171 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
Microsoft QUIC Denial of Service Vulnerability
Affected Products
21 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| .netMicrosoft | See advisory | 7.0.12 |
| Visual Studio 2022Microsoft | See advisory | 17.2.20 |
| Windows 11 22h2Microsoft | See advisory | 10.0.22621.2428 |
| Windows Server 2022Microsoft | >= 10.0.20348.0 | 10.0.20348.2031 |
| dotnet7-buildalpine | See advisory | 7.0.113-r0 |
Patched Releases
.NET 7.0
7.0.13
dotnet
7.0.12
dotnet-sdk
7.0.12
dotnet7-build
7.0.112-r0, 7.0.113-r0
dotnet7-runtime
7.0.12-r0, 7.0.13-r0
.net
7.0.12
Visual Studio 2022
17.2.20
Microsoft Visual Studio 2022 version 17.2
17.2.21
Microsoft Visual Studio 2022 version 17.4
17.4.13
Microsoft Visual Studio 2022 version 17.6
17.6.9
Microsoft Visual Studio 2022 version 17.7
17.7.6
Windows 11 22h2
10.0.22621.2428
Microsoft.Native.Quic.MsQuic.OpenSSL
2.2.3
Microsoft.Native.Quic.MsQuic.Schannel
2.2.3
PowerShell 7.3
7.3.9
Windows 11 version 21H2
10.0.22000.2538
Windows 11 version 22H2
10.0.22621.2428
Windows Server 2022
10.0.20348.2031
Timeline
Publicly disclosed
Oct 10, 2023
Last updated
Sep 8, 2026
Weakness Type
- CWE-400 Uncontrolled Resource Consumption
- CWE-476 NULL Pointer Dereference
References
- advisoryGHSA advisory
- advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2023-38171
- articlehttps://github.com/microsoft/msquic/commit/3226cff07d22662f16fc98d605656860e64cd343
- articlehttps://github.com/microsoft/msquic/security/advisories/GHSA-xh5m-8qqp-c5x7
- articleMicrosoft QUIC Denial of Service Vulnerability
FAQ
Common Questions.
Microsoft QUIC Denial of Service Vulnerability
Affected: .net (Microsoft); Visual Studio 2022 (Microsoft); Windows 11 22h2 (Microsoft), among others. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including .NET 7.0 7.0.13, dotnet 7.0.12, dotnet-sdk 7.0.12.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.
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