CVE-2025-36854 describes a critical use-after-free vulnerability (CWE-416) in End-of-Life (EOL) ASP.NET versions 6.0.0 through 6.0.36. This race condition, occurring when closing an HTTP/3 stream while writing to the response body, can lead to Remote Code Execution. With a CVSS score of 8.1 (HIGH), it poses a significant risk due to its network-based attack vector, high impact on confidentiality, integrity, and availability, and low attack complexity. Although no active exploits, public exploit code, or significant community discussion have been observed, the vendor will not provide updates for this EOL software, necessitating immediate mitigation for affected self-contained applications through recompilation and redeployment.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
| Microsoft | Microsoft.AspNetCore.App.Runtime.Linux-Arm | >= >=6.0.0, <= 6.0.36CNA affecteddefault unaffected | |
| Microsoft | Microsoft.AspNetCore.App.Runtime.Linux-Arm64 | >= >=6.0.0, <= 6.0.36CNA affecteddefault unaffected | |
| Microsoft | Microsoft.AspNetCore.App.Runtime.Linux-Musl-Arm | >= >=6.0.0, <= 6.0.36CNA affecteddefault unaffected | |
| Microsoft | Microsoft.AspNetCore.App.Runtime.Linux-Musl-Arm64 | >= >=6.0.0, <= 6.0.36CNA affecteddefault unaffected | |
| Microsoft | Microsoft.AspNetCore.App.Runtime.Linux-Musl-X64 | >= >=6.0.0, <= 6.0.36CNA affecteddefault unaffected |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
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The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
Remediation records are not available for this CVE.