CVE-2025-33073

HIGH8.8

CISA KEV

Published 2025-06-10 · Updated 2026-06-17 · Source secure@microsoft.com

Summary

CVE-2025-33073 is a high-severity (CVSS 8.8) vulnerability in Microsoft Windows. CISA added it to the Known Exploited Vulnerabilities catalog on October 20, 2025, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by November 10, 2025. CISA does not currently list it as used in ransomware campaigns. Microsoft has 390 vulnerabilities in the KEV catalog, 117 of them linked to ransomware.

All 390 known-exploited Microsoft vulnerabilities →

Description

Improper access control in Windows SMB allows an authorized attacker to elevate privileges over a network.

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE-284

CISA Known-Exploited Vulnerability

Product: Microsoft — Windows

Name: Microsoft Windows SMB Client Improper Access Control Vulnerability

Date added: 2025-10-20 · Due: 2025-11-10

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.

References

View on NVD

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