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CVE-2023-36435

Microsoft QUIC Denial of Service Vulnerability

7.5 HighFix available

Microsoft QUIC Denial of Service Vulnerability

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

5.72%Up 5.7 points since Oct 11, 2023
90%50%10%1%

What each source reports

CVE List Score used 7.5

Microsoft QUIC Denial of Service Vulnerability

Microsoft QUIC Denial of Service Vulnerability

Record
CVE-2023-36435
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C
Weakness
CWE-400
Updated
2026-11-02
EUVDEUVD-2023-2731 7.5

Microsoft QUIC Denial of Service Vulnerability

Record
EUVD-2023-2731
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C
Updated
2026-11-02
GitHub AdvisoriesGHSA-fr44-546p-7xcp 7.5

MsQuic Remote Denial of Service Vulnerability

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:

Workarounds

Beyond upgrading to the patched versions, there is no other workaround.

Record
GHSA-fr44-546p-7xcp
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-400, CWE-401
Updated
2026-11-02
NVD 7.5

Microsoft QUIC Denial of Service Vulnerability

Record
CVE-2023-36435
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-400
Updated
2026-11-02
OSVALPINE-CVE-2023-36435 7.5

Microsoft QUIC Denial of Service Vulnerability

Record
ALPINE-CVE-2023-36435
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-03
OSV 7.5

Microsoft QUIC Denial of Service Vulnerability

Record
CVE-2023-36435
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVGHSA-fr44-546p-7xcp 7.5

MsQuic Remote Denial of Service Vulnerability

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:

Workarounds

Beyond upgrading to the patched versions, there is no other workaround.

Record
GHSA-fr44-546p-7xcp
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-400, CWE-401
Updated
2026-11-02
OSVBIT-dotnet-2023-36435 No score

Microsoft QUIC Denial of Service Vulnerability

Microsoft QUIC Denial of Service Vulnerability

Record
BIT-dotnet-2023-36435
Updated
2026-11-02
OSVBIT-dotnet-sdk-2023-36435 No score

Microsoft QUIC Denial of Service Vulnerability

Microsoft QUIC Denial of Service Vulnerability

Record
BIT-dotnet-sdk-2023-36435
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
Microsoft.Native.Quic.MsQuic.OpenSSL
NuGet
 before 2.2.3
2.2.3
Microsoft.Native.Quic.MsQuic.Schannel
NuGet
 before 2.2.3
2.2.3
dotnet7-build
Alpine:v3.18
 before 7.0.112-r0
7.0.112-r07.0.113-r0
dotnet7-build
Alpine:v3.19
 before 7.0.112-r0
7.0.112-r07.0.113-r0
dotnet7-runtime
Alpine:v3.18
 before 7.0.12-r0
7.0.12-r07.0.13-r0
dotnet7-runtime
Alpine:v3.19
 before 7.0.12-r0
7.0.12-r07.0.13-r0
dotnet
Bitnami
 7.0.0 up to 7.0.13
7.0.13
dotnet-sdk
Bitnami
 7.0.0 up to 7.0.13
7.0.13
Microsoft.Native.Quic.MsQuic.OpenSSL
NuGet
 before 2.2.3, plus listed versions
1.8.0
2.2.3
Microsoft.Native.Quic.MsQuic.Schannel
NuGet
 before 2.2.3, plus listed versions
1.8.0
2.2.3

History

History
RecordedChangedSources
affected, aliases, referencesOSV
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2023-36435 is a high vulnerability (CVSS 7.5) in Microsoft .net, published October 10, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 5.72%, the 93rd percentile. Fixed in Microsoft.Native.Quic.MsQuic.OpenSSL 2.2.3.

References

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