# CVE-2023-36435: MsQuic Remote Denial of Service Vulnerability

Source: https://junglewise.ai/threats/cve-2023-36435-msquic-remote-denial-of-service-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2023-10-10  
License: CC BY 4.0 with a link back

CVE-2023-36435 · Severity: low · CVSS 3.1 · Published 2023-10-10

MsQuic Remote Denial of Service Vulnerability

Technologies: [Microsoft.Native.Quic.MsQuic.OpenSSL (NuGet)](https://junglewise.ai/threats/technologies/microsoft-native-quic-msquic-openssl), [Microsoft.Native.Quic.MsQuic.Schannel (NuGet)](https://junglewise.ai/threats/technologies/microsoft-native-quic-msquic-schannel). Vendors: [NuGet](https://junglewise.ai/threats/vendors/nuget).

## Quick answers

**Is CVE-2023-36435 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2023-36435 being exploited in the wild.

**How severe is CVE-2023-36435?** Low severity, with a CVSS score of 3.1, published 10 October 2023.

**Which products and versions are affected?** Microsoft.Native.Quic.MsQuic.OpenSSL (NuGet) ECOSYSTEM:introduced=0,fixed=2.2.3; Microsoft.Native.Quic.MsQuic.Schannel (NuGet) ECOSYSTEM:introduced=0,fixed=2.2.3.

**Is there a fix for CVE-2023-36435?** Yes. Microsoft.Native.Quic.MsQuic.OpenSSL (NuGet): upgrade to 2.2.3 or later; Microsoft.Native.Quic.MsQuic.Schannel (NuGet): upgrade to 2.2.3 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2023-36435?** Check whether you run Microsoft.Native.Quic.MsQuic.OpenSSL (NuGet) or Microsoft.Native.Quic.MsQuic.Schannel (NuGet) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Microsoft.Native.Quic.MsQuic.OpenSSL (NuGet): upgrade to 2.2.3 or later

  ```sh
  dotnet add package Microsoft.Native.Quic.MsQuic.OpenSSL --version 2.2.3
  ```

- Microsoft.Native.Quic.MsQuic.Schannel (NuGet): upgrade to 2.2.3 or later

  ```sh
  dotnet add package Microsoft.Native.Quic.MsQuic.Schannel --version 2.2.3
  ```


## Affected products

- Microsoft.Native.Quic.MsQuic.OpenSSL (NuGet) ECOSYSTEM:introduced=0,fixed=2.2.3
- Microsoft.Native.Quic.MsQuic.Schannel (NuGet) ECOSYSTEM:introduced=0,fixed=2.2.3

## Identifiers

- CVE-2023-36435
- GHSA-fr44-546p-7xcp

## Related threats

- [Use after free in Microsoft QUIC allows an unauthorized attacker to disclose information over a network.](https://junglewise.ai/threats/cve-2026-85790-microsoft-security-advisory-net-information-disclosure)
- [Heap-based buffer overflow in Microsoft QUIC allows an unauthorized attacker to execute code over a network.](https://junglewise.ai/threats/cve-2026-105016-microsoft-security-advisory-microsoft-quic-remote-code-execution)
- [Microsoft MsQuic hostname validation bypass](https://junglewise.ai/threats/cve-2026-105794-msquic-is-a-cross-platform-c-implementation-of-the-ietf-quic)
- [Microsoft QUIC use-after-free in path migration](https://junglewise.ai/threats/cve-2026-62815-microsoft-quic-use-after-free-in-path-migration)
- [Microsoft QUIC use-after-free remote code execution](https://junglewise.ai/threats/microsoft-quic-use-after-free-remote-code-execution-bc730249)