CVE-2023-36435: Microsoft QUIC Denial of Service Vulnerability
First published: Tue Oct 10 2023(Updated: )
### Impact The MsQuic server will continue to leak memory until no more is available, resulting in a denial of service. ### Patches The following patch was made: - Fix Memory Leak from Multiple Decodes of TP - https://github.com/microsoft/msquic/commit/d364feeda0dd8b729eca6fef149c1ef98630f0cb ### Workarounds Beyond upgrading to the patched versions, there is no other workaround.
Credit: secure@microsoft.com secure@microsoft.com secure@microsoft.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Microsoft PowerShell 7.3 | ||
| nuget/Microsoft.Native.Quic.MsQuic.Schannel | <2.2.3 | 2.2.3 |
| nuget/Microsoft.Native.Quic.MsQuic.OpenSSL | <2.2.3 | 2.2.3 |
| Microsoft Windows 11 | =21H2 | |
| Microsoft Windows Server 2022 | ||
| Microsoft Windows 11 | =22H2 | |
| Microsoft Windows Server 2022 | ||
| Microsoft Windows 11 | =22H2 | |
| Microsoft Windows 11 | =21H2 | |
| Microsoft .NET 7.0 | ||
| Microsoft .NET | >=7.0.0<=7.0.12 | |
| Microsoft Windows 11 21h2 | <10.0.22000.2538 | |
| Microsoft Windows 11 22h2 | <10.0.22621.2428 | |
| Microsoft Windows Server 2022 | ||
| >=7.0.0<=7.0.12 | ||
| <10.0.22000.2538 | ||
| <10.0.22621.2428 | ||
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Reference Links
- https://github.com/microsoft/msquic/security/advisories/GHSA-fr44-546p-7xcp
- https://nvd.nist.gov/vuln/detail/CVE-2023-36435
- https://github.com/microsoft/msquic/commit/d364feeda0dd8b729eca6fef149c1ef98630f0cb
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-36435 (Advisory)
- https://github.com/advisories/GHSA-fr44-546p-7xcp (Advisory)
Frequently Asked Questions
What is CVE-2023-36435?
CVE-2023-36435 is a Microsoft QUIC Denial of Service Vulnerability.
What is the severity of CVE-2023-36435?
The severity of CVE-2023-36435 is high with a CVSS score of 7.5.
Which software products are affected by CVE-2023-36435?
Microsoft Windows 11 (versions 21H2 and 22H2), Microsoft Windows Server 2022, and Microsoft .NET 7.0 are affected by CVE-2023-36435.
How can I fix CVE-2023-36435 on Windows 11 (version 21H2)?
To fix CVE-2023-36435 on Windows 11 (version 21H2), install the patch KB5031358 from the Microsoft Catalog Update site.
How can I fix CVE-2023-36435 on Windows Server 2022?
To fix CVE-2023-36435 on Windows Server 2022, install the patch KB5031364 from the Microsoft Catalog Update site.
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