CVE-2025-33073—Microsoft Windows SMB Client Improper Access Control Vulnerability

Vulnerability Name

Microsoft Windows SMB Client Improper Access Control Vulnerability

Description

Microsoft Windows SMB Client contains an improper access control vulnerability that could allow for privilege escalation. An attacker could execute a specially crafted malicious script to coerce the victim machine to connect back to the attack system using SMB and authenticate.

Known To Be Used in Ransomware Campaigns?

Ransomware Status:

Unknown

Action

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Additional Notes

• https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2025-33073
• https://nvd.nist.gov/vuln/detail/CVE-2025-33073

Related News Articles

• The Gentlemen Ransomware Claims 478 Victims, Can Spread Like a WormJune 11, 2026
• AI Chatbot Recommendations Redirect Users to Cryptojacking Malware SitesMay 27, 2026
• Five New Exploited Bugs Land in CISA's Catalog — Oracle and Microsoft Among TargetsOctober 20, 2025
• CISA: High-severity Windows SMB flaw now exploited in attacksOctober 20, 2025

Related Weaknesses

• CWE-284