New SMB Vulnerability opens door to privilege escalation
On September 9, 2025, Microsoft released details of CVE-2025-55234, a critical vulnerability in the Windows Server Message Block (SMB) protocol. With a CVSS v3 score of 8.8, it’s classified as High severity and poses a serious elevation-of-privilege (EoP) risk. An attacker exploiting this flaw could launch a relay attack, allowing them to gain the privileges of a legitimate user without elevated permissions or insider access.