CVE Watch—

CVE-2025-33073

Microsoft Windows SMB Client Improper Access Control Vulnerability

CVSS

—

No CVSS

EPSS

65.0%

p99

KEV

YES

Oct 20, 2025

Exploit Today

0-100

Published: — · Last modified: —

EPSS · 30d

65.0%EPSS · 30 days65.0%

2026-06-302026-07-16

KEV catalog record

Product

Microsoft / Windows

Vulnerability

Microsoft Windows SMB Client Improper Access Control Vulnerability

Added to KEV

Oct 20, 2025

Remediate by

Nov 10, 2025

Known ransomware use

Summary 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.

Required 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.

Notes

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

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