Microsoft QUIC Denial of Service Vulnerability
Priority HIGH 76CWE-476Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Microsoft. Impact type from Microsoft.
Summary
Microsoft QUIC Denial of Service Vulnerability
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.71046 99th percentileScored 2026-11-07
Fix Fixed Microsoft.Native.Quic.MsQuic.Schannel (NuGet): 2.2.3Microsoft.Native.Quic.MsQuic.OpenSSL (NuGet): 2.2.3Microsoft: 4 updates
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Microsoft | Microsoft Visual Studio 2022 version 17.2 | 17.2.0 to before 17.2.21 | 17.2.21 | Patch available | CNA |
| Microsoft | Microsoft Visual Studio 2022 version 17.4 | 17.4.0 to before 17.4.13 | 17.4.13 | Patch available | CNA |
| Microsoft | Microsoft Visual Studio 2022 version 17.6 | 17.6.0 to before 17.6.9 | 17.6.9 | Patch available | CNA |
| Microsoft | Microsoft Visual Studio 2022 version 17.7 | 17.7.0 to before 17.7.6 | 17.7.6 | Patch available | CNA |
| Microsoft | Windows Server 2022 | 10.0.20348.0 to before 10.0.20348.2031 | 10.0.20348.2031 | Patch available | CNA |
| Microsoft | Windows 11 version 21H2 | 10.0.0 to before 10.0.22000.2538 | 10.0.22000.2538 | Patch available | CNA |
| Microsoft | Windows 11 version 22H2 | 10.0.22621.0 to before 10.0.22621.2428 | 10.0.22621.2428 | Patch available | CNA |
| Microsoft | .NET 7.0 | 7.0.0 to before 7.0.13 | 7.0.13 | Patch available | CNA |
| Microsoft | PowerShell 7.3 | 7.3.0 to before 7.3.9 | 7.3.9 | Patch available | CNA |
| — | Microsoft.Native.Quic.MsQuic.Schannel (NuGet) | before 2.2.3 | 2.2.3 | Patch available | GHSA-xh5m-8qqp-c5x7 |
| — | Microsoft.Native.Quic.MsQuic.OpenSSL (NuGet) | before 2.2.3 | 2.2.3 | Patch available | GHSA-xh5m-8qqp-c5x7 |
- Microsoft Visual Studio 2022 version 17.2 VendorMicrosoft Affected 17.2.0 to before 17.2.21 Fixed in 17.2.21 Patch available CNA
- Microsoft Visual Studio 2022 version 17.4 VendorMicrosoft Affected 17.4.0 to before 17.4.13 Fixed in 17.4.13 Patch available CNA
- Microsoft Visual Studio 2022 version 17.6 VendorMicrosoft Affected 17.6.0 to before 17.6.9 Fixed in 17.6.9 Patch available CNA
- Microsoft Visual Studio 2022 version 17.7 VendorMicrosoft Affected 17.7.0 to before 17.7.6 Fixed in 17.7.6 Patch available CNA
- Windows Server 2022 VendorMicrosoft Affected 10.0.20348.0 to before 10.0.20348.2031 Fixed in 10.0.20348.2031 Patch available CNA
- Windows 11 version 21H2 VendorMicrosoft Affected 10.0.0 to before 10.0.22000.2538 Fixed in 10.0.22000.2538 Patch available CNA
- Windows 11 version 22H2 VendorMicrosoft Affected 10.0.22621.0 to before 10.0.22621.2428 Fixed in 10.0.22621.2428 Patch available CNA
- .NET 7.0 VendorMicrosoft Affected 7.0.0 to before 7.0.13 Fixed in 7.0.13 Patch available CNA
- PowerShell 7.3 VendorMicrosoft Affected 7.3.0 to before 7.3.9 Fixed in 7.3.9 Patch available CNA
- Microsoft.Native.Quic.MsQuic.Schannel (NuGet) Vendor— Affected before 2.2.3 Fixed in 2.2.3 Patch available GHSA-xh5m-8qqp-c5x7
- Microsoft.Native.Quic.MsQuic.OpenSSL (NuGet) Vendor— Affected before 2.2.3 Fixed in 2.2.3 Patch available GHSA-xh5m-8qqp-c5x7
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:* | 7.0.0 to before 7.0.12 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:visual_studio_2022:*:*:*:*:*:*:*:* | 17.2.0 to before 17.2.20; 17.4.0 to before 17.4.12; 17.6.0 to before 17.6.8; 17.7.0 to before 17.7.5 | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_11_22h2:*:*:*:*:*:*:*:* | before 10.0.22621.2428 | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2022:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Microsoft |
- cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:* Versions 7.0.0 to before 7.0.12 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:visual_studio_2022:*:*:*:*:*:*:*:* Versions 17.2.0 to before 17.2.20; 17.4.0 to before 17.4.12; 17.6.0 to before 17.6.8; 17.7.0 to before 17.7.5 Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_11_22h2:*:*:*:*:*:*:*:* Versions before 10.0.22621.2428 Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2022:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
Remediation
- Fix · GHSA-xh5m-8qqp-c5x7 Microsoft.Native.Quic.MsQuic.Schannel (NuGet) Fixed in 2.2.3 Advisory →
- Fix · GHSA-xh5m-8qqp-c5x7 Microsoft.Native.Quic.MsQuic.OpenSSL (NuGet) Fixed in 2.2.3 Advisory →
Microsoft 4 updates
- Security Update
- .NET 7.0 7.0.13
- Security Update
- Windows Server 2022 10.0.20348.2031
- Windows Server 2022 (Server Core installation) 10.0.20348.2031
- Security Update
- Windows 11 version 21H2 for ARM64-based Systems 10.0.22000.2538
- Windows 11 version 21H2 for x64-based Systems 10.0.22000.2538
Show 1 more Microsoft updates
- Security Update
- Windows 11 Version 22H2 for ARM64-based Systems 10.0.22621.2428
- Windows 11 Version 22H2 for x64-based Systems 10.0.22621.2428
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
Not affected: 2 products
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
Microsoft
Microsoft's page for this CVE →
- Impact
- Denial of Service
- Exploited
- No
- Publicly disclosed
- No
- Exploitability
- Exploitation More Likely
| Product | Status | Plan or fix |
|---|---|---|
| Microsoft Visual Studio 2022 version 17.2 | Fixed | 17.2.21 · Security Update |
| Microsoft Visual Studio 2022 version 17.4 | Fixed | 17.4.13 · Security Update |
| Microsoft Visual Studio 2022 version 17.6 | Fixed | 17.6.9 · Security Update |
| Microsoft Visual Studio 2022 version 17.7 | Fixed | 17.7.6 · Security Update |
| PowerShell 7.3 | Fixed | 7.3.9 · Security Update |
Timeline
- 2026-10-02 Threatist record created from CVE-2023-38171
- 2026-10-03 Alias added: GHSA-xh5m-8qqp-c5x7
References
More Microsoft .net vulnerabilities
- TI-2026-79288 Out-of-bounds write in Google Brotli decoder KEVCVSS 4.0CRITICAL 9.2
- TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
- TI-2023-19596 .NET and Visual Studio Denial of Service Vulnerability KEVCVSS 3.1HIGH 7.5
- TI-2024-14152 .NET and Visual Studio Denial of Service Vulnerability CVSS 3.1HIGH 7.5
- TI-2021-08380 .NET Core Remote Code Execution Vulnerability CVSS 3.1CRITICAL 9.8
- TI-2023-18392 ASP.NET Core Security Feature Bypass Vulnerability CVSS 3.1MEDIUM 6.2
Sources
- CVE-2023-38171 · CVE Program
- CVE-2023-38171 · NVD
- FIRST EPSS
- GHSA-xh5m-8qqp-c5x7 · GitHub Advisory Database · CC BY 4.0
- CVE-2023-38171 · Microsoft Security Update Guide
- CVE-2023-38171 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences