CVE-2024-35264Network attack vector

Remote code execution via HTTP/3 stream race

Published Jul 9, 2024 · Updated Feb 10, 2026

Remote code execution in ASP.NET Core 8.0 through 8.0.6 allows remote attackers to execute code through crafted Kestrel HTTP/3 requests. Kestrel's Http3Stream processes DATA frames without locking against concurrent stream aborts, allowing writes or flushes after the request-body pipe is aborted. Exposure requires an application listening with HTTP/3; .NET 6.0 is affected only when its experimental HTTP/3 support is used.

CVSS severity8.1
High
EPSS probability2.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Remote code execution in ASP.NET Core 8.0 through 8.0.6 allows remote attackers to execute code through crafted Kestrel HTTP/3 requests. Kestrel's Http3Stream processes DATA frames without locking against concurrent stream aborts, allowing writes or flushes after the request-body pipe is aborted. Exposure requires an application listening with HTTP/3; .NET 6.0 is affected only when its experimental HTTP/3 support is used.

The record

CVE
CVE-2024-35264
Published
Jul 9, 2024
Updated
Feb 10, 2026
Vendor
Microsoft
Product
.NET 6.0
Classifications
CWE-416, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 9, 2024CVE publishedPublication date reported by the CVE source.
  2. Feb 10, 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=-

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · .NET 6.0version=-
Microsoft · Microsoft Visual Studio 2022 version 17.10version=17.10 <17.10.4
Microsoft · Microsoft Visual Studio 2022 version 17.8version=17.8.0 <17.8.12
Microsoft · Microsoft Visual Studio 2022 version 17.6version=17.6.0 <17.6.17
Microsoft · Microsoft Visual Studio 2022 version 17.4version=17.4.0 <17.4.21
Microsoft · .NET 8.0version=1.0.0 <8.0.7

Published CVSS scores

8.1GitHub Advisory DatabaseCVSS: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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