CVE-2025-55315

9.9 CRITICAL

Published: October 14, 2025 Modified: October 28, 2025

Description

Inconsistent interpretation of http requests ('http request/response smuggling') in ASP.NET Core allows an authorized attacker to bypass a security feature over a network.

AI Explanation

Get an AI-powered plain-language explanation of this vulnerability and remediation steps.

CVSS v3.x Details

0.0 Low Medium High Critical 10.0

Vector String

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-55315

Source: secure@microsoft.com

Vendor Advisory

https://andrewlock.net/understanding-the-worst-dotnet-vulnerability-request-smuggling-and-cve-2025-55315/

Source: af854a3a-2127-422b-91ae-364da2661108

https://gist.github.com/N3mes1s/d0897c13ca199e739ecc2b562f466040

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

3 reference(s) from NVD

Quick Stats

CVSS v3 Score

9.9 / 10.0

EPSS (Exploit Probability)

0.3%

51th percentile

Exploitation Status

Not in CISA KEV

Weaknesses (CWE)

CWE-444

Affected Vendors

microsoft

Related CVEs