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Vulnerabilities

Vulnerability · CVE-2025-36854

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

Published Sep 8, 2025 · catalog updated Sep 8, 2025 · Microsoft Microsoft.AspNetCore.App.Runtime.linux-arm64

Check this week

CVE-2025-36854 is not in CISA KEV. FIRST estimates a 60.00% chance of exploitation in the next 30 days. Check whether you run Microsoft Microsoft.AspNetCore.App.Runtime.linux-arm64.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
60.00%
Remediation
Advisory link
Affected products
vendor Microsoft Microsoft.AspNetCore.App.Runtime.linux-arm64 6.0.0 ≤6.0.36

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 ope

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Microsoft Microsoft.AspNetCore.App.Runtime.linux-arm64 6.0.0 ≤6.0.366.0.0 ≤6.0.36

How to fix CVE-2025-36854

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2025-36854 is not in CISA KEV. FIRST estimates a 60.00% chance of exploitation in the next 30 days. Check whether you run Microsoft Microsoft.AspNetCore.App.Runtime.linux-arm64.

Which versions are affected?

Compare what you have installed with Microsoft Microsoft.AspNetCore.App.Runtime.linux-arm64 6.0.0 ≤6.0.36 6.0.0 ≤6.0.36. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 60.00%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 8, 2025 · EUVD

    Detected

    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 i

  2. Sep 8, 2025 · EUVD

    Updated

    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 i

Sources

  • CVE.orgVulnerability recordCVE-2025-36854

    Official CVE identifier

    cve.org
  • EUVDVulnerability recordEUVD-2025-27133

    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 Fre

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Sep 8, 2025. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.