CVE-2023-38171

Name: CVE-2023-38171
Creator: NVD / NIST
Published: 2023-10-10T18:15:18.087+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 69.49%

Last modified Jun 17, 2026

CVE-2023-38171 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Microsoft QUIC Denial of Service Vulnerability. EPSS estimates a 69.49% chance of exploitation in the next 30 days.

Description

Microsoft QUIC Denial of Service Vulnerability

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

69.49%

99.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-476

Affected Software

Vendor	Product	Versions
Microsoft	.Net	>= 7.0.0, < 7.0.12
Microsoft	Visual Studio 2022	>= 17.2.0, < 17.2.20
Microsoft	Visual Studio 2022	>= 17.4.0, < 17.4.12
Microsoft	Visual Studio 2022	>= 17.6.0, < 17.6.8
Microsoft	Visual Studio 2022	>= 17.7.0, < 17.7.5
Microsoft	Windows 11 22h2	< 10.0.22621.2428
Microsoft	Windows Server 2022	All versions

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-38171Patch, Vendor Advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-38171Patch, Vendor Advisory

Timeline

Published: Oct 10, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-38171?

Microsoft QUIC Denial of Service Vulnerability

How severe is CVE-2023-38171?

CVE-2023-38171 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 69.49% probability of exploitation in the next 30 days.

How do I fix CVE-2023-38171?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-38171?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST