CVE-2024-38229Network attack vector

Remote code execution via HTTP/3 stream race

Published Oct 8, 2024 · Updated Aug 19, 2026

Use-after-free in ASP.NET Core in Microsoft .NET 8.0 and bundled Visual Studio releases allows remote attackers to execute code over HTTP/3. A race occurs when an HTTP/3 stream closes while application code writes to the response body, allowing freed stream state to be reused. Exploitation requires an ASP.NET Core application serving HTTP/3 and precise timing; successful abuse executes code in the application process.

CVSS severity8.1
High
EPSS probability2.08%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in ASP.NET Core in Microsoft .NET 8.0 and bundled Visual Studio releases allows remote attackers to execute code over HTTP/3. A race occurs when an HTTP/3 stream closes while application code writes to the response body, allowing freed stream state to be reused. Exploitation requires an ASP.NET Core application serving HTTP/3 and precise timing; successful abuse executes code in the application process.

The record

CVE
CVE-2024-38229
Published
Oct 8, 2024
Updated
Aug 19, 2026
Vendor
Microsoft
Product
Microsoft Visual Studio 2022 version 17.10
Classifications
CWE-416, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 8, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=17.10 <17.10.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · Microsoft Visual Studio 2022 version 17.10version=17.10 <17.10.8
Microsoft · Microsoft Visual Studio 2022 version 17.8version=17.8.0 <17.8.15
Microsoft · Microsoft Visual Studio 2022 version 17.6version=17.6.0 <17.6.20
Microsoft · .NET 8.0version=8.0.0 <8.0.10
Microsoft · Microsoft Visual Studio 2022 version 17.11version=17.11 <17.11.5

Published CVSS scores

8.1Microsoft CorporationCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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