CVE-2023-38171

FAUCET Score

CVE-2023-38171 is a Microsoft QUIC Denial of Service vulnerability affecting Microsoft .NET, Visual Studio 2022, Windows 11 22H2, and Windows Server 2022. With a CVSS score of 7.5 (High), this vulnerability can be exploited remotely with low attack complexity, leading to a complete denial of service. While there is no evidence of active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), it has garnered some community discussion and media coverage, indicating awareness. It is not currently listed on CISA's KEV catalog.

Impacted Technologies

Vendor	Product	Version(s)	CPE
		>= 7.0.0, < 7.0.12CPE matchmatch criteria	cpe:2.3:a:microsoft:.net::::::::
		>= 17.2.0, < 17.2.20CPE matchmatch criteria	cpe:2.3:a:microsoft:visual_studio_2022::::::::
		>= 17.4.0, < 17.4.12CPE matchmatch criteria	cpe:2.3:a:microsoft:visual_studio_2022::::::::
		>= 17.6.0, < 17.6.8CPE matchmatch criteria	cpe:2.3:a:microsoft:visual_studio_2022::::::::
		>= 17.7.0, < 17.7.5CPE matchmatch criteria	cpe:2.3:a:microsoft:visual_studio_2022::::::::

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

Exploitability Score

3.9

Impact Score

3.6

CvssVersion

3.1

Exploit Intelligence

EPSS Score

69.49%

Probability of exploitation in next 30 days

EPSS Percentile

99.3%

Percentile rank of EPSS score among Peer Group

As of 2026-07-27

Model: v2026.06.15

This CVE's current EPSS score of 0.6949 is in the 99th percentile among its peer group of 51,551 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.