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High, CVSS 7.5

MsQuic Remote Denial of Service Vulnerability

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

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (microsoft.native.quic.msquic.schannel 2.2.3; microsoft.native.quic.msquic.openssl 2.2.3), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
  • CVE-2023-36435: 5.72% estimated exploitation activity in the next 30 days; percentile 93.04 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

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.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-fr44-546p-7xcp

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2023-36435

Advisory: MsQuic Remote Denial of Service Vulnerability
IDs: CVE-2023-36435, GHSA-fr44-546p-7xcp
Record: https://patchnext.com/advisories/cve-2023-36435 (revision 1, source checked 26 Oct 2026, 17:00 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: microsoft.native.quic.msquic.schannel 2.2.3; microsoft.native.quic.msquic.openssl 2.2.3. A vendor fix does not mean a deployment is fixed.

## Affected components
- NuGet microsoft.native.quic.msquic.schannel: affected < 2.2.3; fixed in 2.2.3
- NuGet microsoft.native.quic.msquic.openssl: affected < 2.2.3; fixed in 2.2.3

## Suggested inspection (read-only)
- NuGet microsoft.native.quic.msquic.schannel: check the installed version with your package manager.
- NuGet microsoft.native.quic.msquic.openssl: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on microsoft.native.quic.msquic.schannel, microsoft.native.quic.msquic.openssl.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-fr44-546p-7xcp (GitHub-reviewed advisory GHSA-fr44-546p-7xcp lists affected ranges: NuGet microsoft.native.quic.msquic.openssl >=0 =0 <2.2.3)

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