CVE-2025-33073

Name of the Vulnerable Software and Affected Versions Microsoft Windows (affected versions not specified)

Description Improper access control in the Windows SMB Client, specifically within the mrxsmb.sys driver, allows an authorized or unauthenticated remote attacker to elevate privileges to the NT AUTHORITYSYSTEM level. The issue stems from flaws in access restriction during authentication relay. Attackers can use authentication coercion techniques, such as forcing a request to a UNC path, to compel a Windows host to connect to a malicious system via SMB. By manipulating CREDENTIAL TARGET INFORMATIONW and forcing the use of Kerberos over NTLM, an attacker can capture a Kerberos ticket from a computer account (DOMAINMACHINE$) and relay it back to the same host. This process results in a session with full system control over the target machine via standard RPC/SMB services.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.