CVE-2025-55234

9.8

CRITICAL CVSS 3.1

Windows SMB Elevation of Privilege Vulnerability

Description

SMB Server might be susceptible to relay attacks depending on the configuration. An attacker who successfully exploited these vulnerabilities could perform relay attacks and make the users subject to elevation of privilege attacks. The SMB Server already supports mechanisms for hardening against relay attacks: SMB Server signing SMB Server Extended Protection for Authentication (EPA) Microsoft is releasing this CVE to provide customers with audit capabilities to help them to assess their environment and to identify any potential device or software incompatibility issues before deploying SMB Server hardening measures that protect against relay attacks. If you have not already enabled SMB Server hardening measures, we advise customers to take the following actions to be protected from these relay attacks: Assess your environment by utilizing the audit capabilities that we are exposing in the September 2025 security updates. See Support for Audit Events to deploy SMB Server Hardening—SMB Server Signing & SMB Server EPA. Adopt appropriate SMB Server hardening measures.

INFO

Published Date :

Sept. 9, 2025, 5:16 p.m.

Last Modified :

Oct. 17, 2025, 4:15 p.m.

Remotely Exploit :

Yes !

Source :

[email protected]

Affected Products

The following products are affected by CVE-2025-55234 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID	Vendor	Product
1	Microsoft	windows_server_2008
2	Microsoft	windows_server_2012
3	Microsoft	windows_server_2016
4	Microsoft	windows_server_2019
5	Microsoft	windows_10_1607
6	Microsoft	windows_10_1809
7	Microsoft	windows_10_21h2
8	Microsoft	windows_10_22h2
9	Microsoft	windows_server_2022
10	Microsoft	windows_11_22h2
11	Microsoft	windows_10_1507
12	Microsoft	windows_11_23h2
13	Microsoft	windows_server_2022_23h2
14	Microsoft	windows_server_23h2
15	Microsoft	windows_server_2012_r2
16	Microsoft	windows_server_2008_r2
17	Microsoft	windows_server_2008_sp2
18	Microsoft	windows_11_24h2
19	Microsoft	windows_server_2025

: Total Affected Vendor : 1 | Products : 19

CVSS Scores

The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.

Version	Severity	Source
CVSS 3.1	HIGH	f38d906d-7342-40ea-92c1-6c4a2c6478c8
CVSS 3.1	HIGH	[email protected]
CVSS 3.1	CRITICAL	[email protected]

Solution

Remediate SMB relay attacks by applying security updates.

Apply relevant security updates.
Enable SMB Server signing.
Enable Extended Protection for Authentication.

Public PoC/Exploit Available at Github

CVE-2025-55234 has a 3 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2025-55234.

URL	Resource
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-55234	Vendor Advisory
https://www.vicarius.io/vsociety/posts/cve-2025-55234-detection-script-smb-server-vulnerability-affecting-microsoft-systems
https://www.vicarius.io/vsociety/posts/cve-2025-55234-mitigation-script-smb-server-vulnerability-affecting-microsoft-systems

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2025-55234 is associated with the following CWEs:

CWE-287: Improper Authentication

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2025-55234 weaknesses.

CAPEC-22: Exploiting Trust in Client Exploiting Trust in Client CAPEC-57: Utilizing REST's Trust in the System Resource to Obtain Sensitive Data Utilizing REST's Trust in the System Resource to Obtain Sensitive Data CAPEC-94: Adversary in the Middle (AiTM) Adversary in the Middle (AiTM) CAPEC-114: Authentication Abuse Authentication Abuse CAPEC-115: Authentication Bypass Authentication Bypass CAPEC-151: Identity Spoofing Identity Spoofing CAPEC-194: Fake the Source of Data Fake the Source of Data CAPEC-593: Session Hijacking Session Hijacking CAPEC-633: Token Impersonation Token Impersonation CAPEC-650: Upload a Web Shell to a Web Server Upload a Web Shell to a Web Server

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

h4xnz/CVE-2025-55234-POC

Windows SMB Server Elevation of Privilege Vulnerability

Updated: 1 month ago

1 stars 0 fork 0 watcher

Born at : Nov. 1, 2025, 10:43 a.m. This repo has been linked 1 different CVEs too.

mrk336/Patch-the-Path-CVE-2025-55234-Detection-Defense

This playbook outlines detection, containment, and remediation strategies for CVE-2025-55234, a critical Windows SMB privilege escalation flaw.

Updated: 2 months, 3 weeks ago

0 stars 0 fork 0 watcher

Born at : Sept. 15, 2025, 3:21 a.m. This repo has been linked 1 different CVEs too.

mrk336/CVE-2025-55234

This vulnerability allows attackers to perform relay attacks against the SMB (Server Message Block) protocol. If successful, it can lead to Elevation of Privilege (EoP) essentially allowing unauthorized users to gain higher-level access on a system

Updated: 2 months, 3 weeks ago

0 stars 0 fork 0 watcher

Born at : Sept. 13, 2025, 2:39 a.m. This repo has been linked 4 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2025-55234 vulnerability anywhere in the article.

Daily CyberSecurity

Curly COMrades APT Bypasses EDR by Hiding Linux Backdoor Inside Covert Hyper-V VM

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Published Date: Nov 06, 2025 (1 month ago)

CrowdStrike.com

September 2025 Patch Tuesday: Two Publicly Disclosed Zero-Days and Eight Critical Vulnerabilities Among 84 CVEs

Microsoft has addressed 84 vulnerabilities in its September 2025 security update release. This month's patches address two publicly disclosed zero-day vulnerabilities and eight Critical vulnerabilitie ...