CVE-2025-55234: Windows SMB Elevation of Privilege Vulnerability
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.
Other sources
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.
— NVD
Windows SMB Elevation of Privilege Vulnerability
— Microsoft
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2025-55234?
CVE-2025-55234 has been classified as a high severity vulnerability due to its potential to allow relay attacks and elevation of privilege.
How do I fix CVE-2025-55234?
To mitigate CVE-2025-55234, apply the recommended security patches provided in the Microsoft update guide for the affected products.
What systems are affected by CVE-2025-55234?
CVE-2025-55234 affects various versions of Microsoft Windows Server, including 2008, 2012, 2016, and 2022, as well as Windows 10 and Windows 11.
What are the potential impacts of CVE-2025-55234?
If exploited, CVE-2025-55234 could allow an attacker to perform relay attacks, which may lead to unauthorized privilege escalation on vulnerable systems.
Is there a workaround for CVE-2025-55234 while patches are being applied?
A recommended workaround for CVE-2025-55234 is to review and adjust the SMB Server configuration to minimize exposure to potential relay attacks.