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Fencer Vulns
high 8.1

CVE-2025-36854 json

EOL ASP.NET 6.0 Remote Code Execution Vulnerability

published 2025-09-08 14 mo ago modified 2026-09-18 51 d ago also BIT-dotnet-2025-36854 , BIT-dotnet-sdk-2025-36854 , EUVD-2025-27133

cvss
8.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 49%
public exploits
0
none known

Summary

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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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.

Patch / fix

  • bitnami dotnet 8.0.1
  • bitnami dotnet-sdk 6.0.418

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
14 mo ago

Exploit prediction

0.60% chance of exploitation in the next 30 days, higher than 49% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
OSV 3.1 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
bitnami dotnet
>=6.0.0, <8.0.1
8.0.1
bitnami dotnet-sdk
>=6.0.0, <6.0.418
6.0.418

Affected products

  • Microsoft .NET 6.0
  • Microsoft Microsoft.AspNetCore.Identity
  • Microsoft Microsoft.AspNetCore.App.Runtime.win-arm
  • Microsoft Microsoft.AspNetCore.App.Runtime.win-arm64
  • Microsoft Microsoft.AspNetCore.App.Runtime.win-x64
  • Microsoft Microsoft.AspNetCore.App.Runtime.win-x86
  • Microsoft Microsoft.AspNetCore.App.Runtime.linux-arm
  • Microsoft Microsoft.AspNetCore.App.Runtime.linux-arm64
  • Microsoft Microsoft.AspNetCore.App.Runtime.linux-musl-arm
  • Microsoft Microsoft.AspNetCore.App.Runtime.linux-musl-arm64
  • Microsoft Microsoft.AspNetCore.App.Runtime.linux-musl-x64
  • Microsoft Microsoft.AspNetCore.App.Runtime.linux-x64
  • Microsoft Microsoft.AspNetCore.App.Runtime.osx-arm64
  • Microsoft Microsoft.AspNetCore.App.Runtime.osx-x64

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.