CVE-2025-33073

Windows SMB Client Elevation of Privilege Vulnerability

CVSS 3.1 High 8.8Known exploited (CISA KEV)

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C

Description

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

Key data

CVSS 3.1 High 8.8

Score published by microsoft in the CVE record.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C

Attack vector: Network
The vulnerable component can be reached over a network, possibly from the Internet.
Attack complexity: Low
No special conditions are needed. The attack can be repeated at will.
Privileges required: Low
A basic user account is needed.
User interaction: None
No action from any user is needed.
Scope: Unchanged
The impact stays within the vulnerable component.
Confidentiality impact: High
Serious or total effect on the secrecy of data.
Integrity impact: High
Serious or total effect on the trustworthiness of data.
Availability impact: High
Serious or total effect on availability.

Metric	Value	What it means
Attack vector	Network	The vulnerable component can be reached over a network, possibly from the Internet.
Attack complexity	Low	No special conditions are needed. The attack can be repeated at will.
Privileges required	Low	A basic user account is needed.
User interaction	None	No action from any user is needed.
Scope	Unchanged	The impact stays within the vulnerable component.
Confidentiality impact	High	Serious or total effect on the secrecy of data.
Integrity impact	High	Serious or total effect on the trustworthiness of data.
Availability impact	High	Serious or total effect on availability.

CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at first.org/cvss.

EPSS

Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.

Score: 0.82829 (82.8% probability)
Percentile: 99.7%
Scores of: Nov 10, 2026
Model: v2026.06.15

CISA Known Exploited Vulnerabilities

This CVE is listed in the CISA KEV catalog.

Name in the catalog: Microsoft Windows SMB Client Improper Access Control Vulnerability
Added to the catalog: Oct 20, 2025
Federal due date: Nov 10, 2025

CISA assessment as of Oct 21, 2025

Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA.

Exploitation: Recorded by CISA as active
Automatable: no
Technical impact: total

Weakness (CWE)

CWE catalog version 5.0.

CWE-284Improper Access Control

Affected products

Products listed in the CVE record, as the CNA published them.

Microsoft Windows 10 Version 1507
- affected: 10.0.10240.0 up to before 10.0.10240.21034
Microsoft Windows 10 Version 1607
- affected: 10.0.14393.0 up to before 10.0.14393.8148
Microsoft Windows 10 Version 1809
- affected: 10.0.17763.0 up to before 10.0.17763.7434
Microsoft Windows 10 Version 21H2
- affected: 10.0.19044.0 up to before 10.0.19044.5965
Microsoft Windows 10 Version 22H2
- affected: 10.0.19045.0 up to before 10.0.19045.5965
Microsoft Windows 11 version 22H2
- affected: 10.0.22621.0 up to before 10.0.22621.5472
Microsoft Windows 11 version 22H3
- affected: 10.0.22631.0 up to before 10.0.22631.5472
Microsoft Windows 11 Version 23H2
- affected: 10.0.22631.0 up to before 10.0.22631.5472
Microsoft Windows 11 Version 24H2
- affected: 10.0.26100.0 up to before 10.0.26100.4349
Microsoft Windows Server 2008 R2 Service Pack 1
- affected: 6.1.7601.0 up to before 6.1.7601.27769
Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation)
- affected: 6.1.7601.0 up to before 6.1.7601.27769
Microsoft Windows Server 2008 Service Pack 2
- affected: 6.0.6003.0 up to before 6.0.6003.23351
Microsoft Windows Server 2008 Service Pack 2 (Server Core installation)
- affected: 6.0.6003.0 up to before 6.0.6003.23351
Microsoft Windows Server 2012
- affected: 6.2.9200.0 up to before 6.2.9200.25522
Microsoft Windows Server 2012 (Server Core installation)
- affected: 6.2.9200.0 up to before 6.2.9200.25522
Microsoft Windows Server 2012 R2
- affected: 6.3.9600.0 up to before 6.3.9600.22620
Microsoft Windows Server 2012 R2 (Server Core installation)
- affected: 6.3.9600.0 up to before 6.3.9600.22620
Microsoft Windows Server 2016
- affected: 10.0.14393.0 up to before 10.0.14393.8148
Microsoft Windows Server 2016 (Server Core installation)
- affected: 10.0.14393.0 up to before 10.0.14393.8148
Microsoft Windows Server 2019
- affected: 10.0.17763.0 up to before 10.0.17763.7434
Microsoft Windows Server 2019 (Server Core installation)
- affected: 10.0.17763.0 up to before 10.0.17763.7434
Microsoft Windows Server 2022
- affected: 10.0.20348.0 up to before 10.0.20348.3807
Microsoft Windows Server 2022, 23H2 Edition (Server Core installation)
- affected: 10.0.25398.0 up to before 10.0.25398.1665
Microsoft Windows Server 2025
- affected: 10.0.26100.0 up to before 10.0.26100.4349
Microsoft Windows Server 2025 (Server Core installation)
- affected: 10.0.26100.0 up to before 10.0.26100.4349

References

Links listed in the CVE record. They lead to other sites, which CubePath does not control.

Windows SMB Client Elevation of Privilege Vulnerability (msrc.microsoft.com)vendor-advisorypatch
vicarius.io/vsociety/posts/cve-2025-33073-detection-script-…
vicarius.io/vsociety/posts/cve-2025-33073-mitigation-script…

Timeline

ID reservedApr 15, 2025
Record publishedJun 10, 2025
Added to CISA KEVOct 20, 2025
Record last updatedFeb 26, 2026

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Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:51 UTC. Sources and licenses