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CVE-2025-55315

CRITICAL Exploitation: PoC

9.9

CVSS 3.1

Metadata

CVE ID: CVE-2025-55315
State: PUBLISHED
Assigner: microsoft
Reserved: 2025-08-12 20:19 UTC
Published: 2025-10-14 17:00 UTC
Last updated: 2026-02-22 17:24 UTC
Primary CWE: CWE-444
CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP…
Vendor / Product: Microsoft / ASP.NET Core 2.3
Sources: cve.org · NVD

Severity & Metrics

9.9 CRITICAL CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L/E:U/RL:O/RC:C

SSVC — CISA Coordinator

Exploitation: PoC
Automatable: no
Tech. Impact: total

Affected products (6)

Vendor	Product	Platform	Versions
Microsoft	ASP.NET Core 2.3	—	2.3 < 2.3.6
Microsoft	ASP.NET Core 8.0	—	8.0 < 8.0.21
Microsoft	ASP.NET Core 9.0	—	9.0 < 9.0.10
Microsoft	Microsoft Visual Studio 2022 version 17.10	—	17.10.0 < 17.10.20
Microsoft	Microsoft Visual Studio 2022 version 17.12	—	17.12.0 < 17.12.13
Microsoft	Microsoft Visual Studio 2022 version 17.14	—	17.14.0 < 17.14.17

Weakness (CWE)

CWE	Source	Description
CWE-444	cna	CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

CVSS scores (1)

Score	Severity	Version	Source	Vector
9.9	CRITICAL	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L/E:U/RL:O/RC:C

References (1)

ASP.NET Security Feature Bypass Vulnerability https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-55315

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