Use After Free in Microsoft Microsoft.aspnetcore.app.runtime.linux-arm

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 condition may lead to use-after-free, resulting in Remote C…

Vulnerability class: Use-After-Free

EPSS: 0.003 (55.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2025-36854?
CVE-2025-36854 is a high-severity vulnerability in Microsoft Microsoft.aspnetcore.app.runtime.linux-arm, classified under Use After Free. CVSS score: 8.1/10. Published 2025-09-08.
How severe is CVE-2025-36854?
High severity. CVSS v3 base score is 8.1 out of 10.
Is CVE-2025-36854 known to be exploited?
1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.