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Vulnerability · Published Sep 8, 2025 · Assigned by HeroDevs

CVE-2025-36854EOL ASP.NET 6.0 Remote Code Execution Vulnerability

High 8.1

In plain English

A high-severity use-after-free in Microsoft.AspNetCore.App.Runtime.linux-arm from Microsoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 49% of all known vulnerabilities).

Severity (CVSS 3.1)8.1High
Exploit odds (30 days)0.6%top 51.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

A vulnerability ( CVE-2024-38229 https://www.cve.org/CVERecord ) exists in EOL ASP.NET when closing an HTTP/3 stream while application code is writing to the response body, a race condition may lead to use-after-free, resulting in Remote Code Execution. Per CWE-416: Use After Free https://cwe.mitre.org/data/definitions/416.html , Use After Free is when a product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer. This issue affects EOL ASP.NET 6.0.0 <= 6.0.36 as represented in this CVE, as well as 8.0.0 <= 8.0.8, 9.0.0-preview.1.24081.5 <= 9.0.0.RC.1 as represented in  CVE-2024-38229 https://www.cve.org/CVERecord . Additionally, if you've deployed self-contained applications https://docs.microsoft.com/dotnet/core/deploying/#self-contained-deployments-scd  targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. NOTE: This CVE only represents End Of Life (EOL) software components. The vendor, Microsoft, has indicated there will be no future updates nor support provided upon inquiry.

Affected products (as reported)

VendorProductVersions
Microsoft .NET 6.0 6.0.0 – through 6.0.36
Microsoft Microsoft.AspNetCore.Identity >=6.0.0 – through 6.0.36
Microsoft Microsoft.AspNetCore.App.Runtime.win-arm >=6.0.0 – through 6.0.36
Microsoft Microsoft.AspNetCore.App.Runtime.win-arm64 >=6.0.0 – through 6.0.36
Microsoft Microsoft.AspNetCore.App.Runtime.win-x64 >=6.0.0 – through 6.0.36
Microsoft Microsoft.AspNetCore.App.Runtime.win-x86 >=6.0.0 – through 6.0.36
Microsoft Microsoft.AspNetCore.App.Runtime.linux-arm >=6.0.0 – through 6.0.36
Microsoft Microsoft.AspNetCore.App.Runtime.linux-arm64 >=6.0.0 – through 6.0.36
Microsoft Microsoft.AspNetCore.App.Runtime.linux-musl-arm >=6.0.0 – through 6.0.36
Microsoft Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 >=6.0.0 – through 6.0.36
Microsoft Microsoft.AspNetCore.App.Runtime.linux-musl-x64 >=6.0.0 – through 6.0.36
Microsoft Microsoft.AspNetCore.App.Runtime.linux-x64 >=6.0.0 – through 6.0.36
Microsoft Microsoft.AspNetCore.App.Runtime.osx-arm64 >=6.0.0 – through 6.0.36
Microsoft Microsoft.AspNetCore.App.Runtime.osx-x64 >=6.0.0 – through 6.0.36

Weakness: CWE-416 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

References