Security Updates for Microsoft .NET Framework (October 2025)

critical Nessus Plugin ID 271264

Synopsis

The Microsoft .NET Framework installation on the remote host is missing a security update.

Description

The Microsoft .NET Framework installation on the remote host is missing a security update. It is, therefore, affected by the following vulnerability:

- An information disclosure vulnerability. An attacker can exploit this to disclose potentially sensitive information. (CVE-2025-55248)

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

Solution

Microsoft has released the following security updates to address this issue:
-KB5066128
-KB5066740
-KB5066742
-KB5066743
-KB5066738
-KB5066136

See Also

https://support.microsoft.com/en-us/help/5066128

https://support.microsoft.com/en-us/help/5066740

https://support.microsoft.com/en-us/help/5066742

https://support.microsoft.com/en-us/help/5066743

https://support.microsoft.com/en-us/help/5066738

https://support.microsoft.com/en-us/help/5066136

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-55248

Plugin Details

Severity: Critical

ID: 271264

File Name: smb_nt_ms25_oct_dotnet.nasl

Version: 1.1

Type: local

Agent: windows

Published: 10/23/2025

Updated: 10/23/2025

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Critical

Base Score: 10

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

CVSS Score Source: CVE-2025-55248

CVSS v3

Risk Factor: Critical

Base Score: 9.8

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

Vulnerability Information

CPE: cpe:/a:microsoft:.net_framework

Required KB Items: SMB/MS_Bulletin_Checks/Possible

Patch Publication Date: 10/15/2025

Vulnerability Publication Date: 10/15/2025

Reference Information

CVE: CVE-2025-55248

MSFT: MS25-5066128, MS25-5066136, MS25-5066738, MS25-5066740, MS25-5066742, MS25-5066743

MSKB: 5066128, 5066136, 5066738, 5066740, 5066742, 5066743