Microsoft ASP.NET Core Security Feature Bypass (October 2025)

critical Nessus Plugin ID 270707

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Synopsis

The remote Windows host is affected by a security feature bypass vulnerability.

Description

The version of ASP.NET Core installed on the remote Windows host is 8.0.x prior to 8.0.21, 9.0.x prior to 9.0.10, or 10.0.0-rc.1.25451.107. It is, therefore, affected by a security feature bypass vulnerability.
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.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Update .NET Core to version 8.0.21, 9.0.10, 10.0.0-rc.2.25502.107 or later.

Plugin Details

Severity: Critical

ID: 270707

File Name: smb_nt_ms25_oct_aspdotnet_core.nasl

Version: 1.1

Type: local

Agent: windows

Family: Windows : Microsoft Bulletins

Published: 10/17/2025

Updated: 10/17/2025

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: High

Score: 8.1

CVSS v2

Risk Factor: High

Base Score: 8.7

Vector: CVSS2#AV:N/AC:L/Au:S/C:C/I:C/A:P

CVSS Score Source: CVE-2025-55315

CVSS v3

Risk Factor: Critical

Base Score: 9.9

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L

Vulnerability Information

CPE: cpe:/a:microsoft:asp.net_core

Required KB Items: SMB/Registry/Enumerated, installed_sw/ASP .NET Core Windows

Patch Publication Date: 10/14/2025

Vulnerability Publication Date: 10/14/2025

Reference Information

CVE: CVE-2025-55315

IAVA: 2025-A-0753

Detections

Analytics