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CVE-2023-38171· NVD / CVE Program· CNA microsoft

Microsoft QUIC Denial of Service Vulnerability

HighCVSS 7.5 · v3.1—No exploit Fix available
Published
Oct 10, 2023
Updated
Jun 17, 2026
EPSS
69.7% · 99th percentile
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Report tools

JSON

Action score

51

Plan

Add it to your regular patch cycle.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
21 / 30 · 69.7%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · microsoft
7.5
NVD has not scored this yet; the score shown is the CNA’s.

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Affected systems

VendorProduct
microsoft.net
microsoftvisual studio 2022
microsoftwindows 11 22h2
microsoftwindows server 2022

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • microsoft windows server 2022all versions

Versions reported by the vendor

Affected version ranges reported by the assigning authority (microsoft). Independent of NVD's CPE analysis and usually ahead of it.

  • Microsoft .NET 7.0

    • 7.0.0 and later · before 7.0.13affected

  • Microsoft Microsoft Visual Studio 2022 version 17.2

    • 17.2.0 and later · before 17.2.21affected

  • Microsoft Microsoft Visual Studio 2022 version 17.4

    • 17.4.0 and later · before 17.4.13affected

  • Microsoft Microsoft Visual Studio 2022 version 17.6

    • 17.6.0 and later · before 17.6.9affected

  • Microsoft Microsoft Visual Studio 2022 version 17.7

    • 17.7.0 and later · before 17.7.6affected

  • Microsoft PowerShell 7.3

    • 7.3.0 and later · before 7.3.9affected

  • Microsoft Windows 11 version 21H2

    • 10.0.0 and later · before 10.0.22000.2538affected

  • Microsoft Windows 11 version 22H2

    • 10.0.22621.0 and later · before 10.0.22621.2428affected

  • Microsoft Windows Server 2022

    • 10.0.20348.0 and later · before 10.0.20348.2031affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
NuGetMicrosoft.Native.Quic.MsQuic.OpenSSLbefore 2.2.32.2.3
NuGetMicrosoft.Native.Quic.MsQuic.Schannelbefore 2.2.32.2.3

Same product

microsoft: all records

Other highest-scoring records for the same primary product.

  • CVE-2023-38180.NET and Visual Studio Denial of Service VulnerabilityKEV
    64This week
  • CVE-2021-26701.NET Core Remote Code Execution Vulnerability
    41Plan
  • CVE-2024-43498.NET and Visual Studio Remote Code Execution Vulnerability
    40Plan
  • CVE-2025-21176.NET, .NET Framework, and Visual Studio Remote Code Execution Vulnerability
    36Monitor
  • CVE-2026-69439.NET and Visual Studio Elevation of Privilege Vulnerability
    35Monitor
  • CVE-2026-47303ASP.NET Core Elevation of Privilege Vulnerability
    35Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
NuGet:Microsoft.Native.Quic.MsQuic.OpenSSL2.2.3Package registry (OSV)
NuGet:Microsoft.Native.Quic.MsQuic.Schannel2.2.3Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-476 · NULL Pointer Dereference

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records