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CVE-2025-33073

Windows SMB Client Elevation of Privilege Vulnerability

Published: Jun 10, 2025Updated: Oct 27, 2025 Sources: CVE List NVD BDUCWE-284
8.8HIGH
NVD MITRE
EPSS Score
65.0%
Top 0.9%
CISA KEV
Active Exploitation
Since Oct 20, 2025
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

Description

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

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-284

Affected Products

Microsoft Corp
commercial·USaka microsoft, microsoft corporation
Windows Server 2008 Service Pack 2 (Server Core Installation)On-premOS
Operating Systems / windows
Windows Server 2012 (Server Core installation)On-premOS
Operating Systems / windows
Windows Server 2012 R2 (Server Core installation)On-premOS
Operating Systems / windows
Windows Server 2008 R2 Service Pack 1 (Server Core installation)On-premOS
Operating Systems / windows
Windows 10 Version 1507On-premOS
Operating Systems / windows
Windows Server 2016 (Server Core installation)On-premOS
Operating Systems / windows
Windows Server 2019 (Server Core installation)On-premOS
Operating Systems / windows
Windows Server 2022 (Server Core installation)On-premOS
Operating Systems / windows
and 57 more affected products View all →

Exploitability

CISA Known Exploited Vulnerability
Added to KEV:Oct 20, 2025
Remediation due:Nov 10, 2025

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.

Official Patch Available
Workaround Available
Is your org exposed to CVE-2025-33073?We can run the check for you — a free external exposure review, no install. Check my exposure

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-33073
msrc.microsoft.com
https://www.helpnetsecurity.com/2025/06/11/microsoft-fixes-zero-day-exploited-for-cyber-espionage-cve-2025-33053/
helpnetsecurity.com
https://www.synacktiv.com/publications/ntlm-reflection-is-dead-long-live-ntlm-reflection-an-in-depth-analysis-of-cve-2025
synacktiv.com
and 6 more references View all →
News mentions
3

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