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Fencer Vulns
high 7.5

CVE-2023-36435 json

Microsoft QUIC Denial of Service Vulnerability

published 2023-10-10 3 y ago modified 2026-09-08 2 mo ago also BIT-dotnet-2023-36435 , BIT-dotnet-sdk-2023-36435 , EUVD-2023-2731 , GHSA-fr44-546p-7xcp

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
5.7%
EPSS 5.7% chance of exploitation in 30 days, percentile 93%
public exploits
0
none known

Summary

Microsoft QUIC Denial of Service Vulnerability

Patch / fix

  • nuget Microsoft.Native.Quic.MsQuic.OpenSSL 2.2.3
  • nuget Microsoft.Native.Quic.MsQuic.Schannel 2.2.3
  • bitnami dotnet 7.0.13
  • bitnami dotnet-sdk 7.0.13
  • Microsoft PowerShell 7.3 7.3.9
  • Microsoft Windows Server 2022 10.0.20348.2031
  • Microsoft Windows 11 version 21H2 10.0.22000.2538
  • Microsoft Windows 11 version 22H2 10.0.22621.2428
  • Microsoft .NET 7.0 7.0.13
  • dotnet7-build Alpine 3.19, Alpine 3.18 7.0.112-r0
  • dotnet7-build Alpine 3.19, Alpine 3.18 7.0.113-r0
  • dotnet7-runtime Alpine 3.19, Alpine 3.18 7.0.12-r0
  • dotnet7-runtime Alpine 3.19, Alpine 3.18 7.0.13-r0

alpine advisories ALPINE-CVE-2023-36435

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-36435 updated cvss 7.5

dotnet: memory leak in MsQuic.dll may lead to denial of service

  • Red Hat Enterprise Linux 8 dotnet, dotnet6.0, dotnet7.0, dotnet-host, dotnet-sdk-6.0, dotnet-sdk-7.0, +17 more Red Hat Enterprise Linux 9 dotnet6.0, dotnet7.0, dotnet8.0, dotnet-host, dotnet-sdk-6.0, dotnet-sdk-7.0, +29 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-24-165-04 updated cvss 7.5

Siemens ST7 ScadaConnect

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
20 mo ago

Exploit prediction

5.72% chance of exploitation in the next 30 days, higher than 93% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
nuget Microsoft.Native.Quic.MsQuic.OpenSSL
<2.2.3
2.2.3
nuget Microsoft.Native.Quic.MsQuic.Schannel
<2.2.3
2.2.3
bitnami dotnet
>=7.0.0, <7.0.13
7.0.13
bitnami dotnet-sdk
>=7.0.0, <7.0.13
7.0.13

Affected products

  • Microsoft PowerShell 7.3
  • Microsoft Windows Server 2022
  • Microsoft Windows 11 version 21H2
  • Microsoft Windows 11 version 22H2
  • Microsoft .NET 7.0

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption
  • CWE-401 Missing Release of Memory after Effective Lifetime

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.