Known exploited vulnerability
CVE-2025-33073
The short answer
CVE-2025-33073 affects Microsoft Windows 10 Version 1507 and is rated high (CVSS 8.8). CISA added it to the Known Exploited Vulnerabilities catalog on 2025-10-20: attackers are using it, so patch it first.
What it is
Improper access control in Windows SMB allows an authorized attacker to elevate privileges over a network.
Weakness: CWE-284.
Severity
8.8 high
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Exploited (CISA KEV)
Yes, since Oct 20, 2025
Federal due date Nov 10, 2025
EPSS, next 30 days
83%
Higher than 100% of scored CVEs
How it can be exploited
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
What CISA says to do
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Affected products
Windows 10 Version 1507, Windows 10 Version 1607, Windows 10 Version 1809, Windows 10 Version 21H2, Windows 10 Version 22H2, Windows 11 version 22H2, Windows 11 version 22H3, Windows 11 Version 23H2, Windows 11 Version 24H2, Windows Server 2008 R2 Service Pack 1, Windows Server 2008 R2 Service Pack 1 (Server Core installation), Windows Server 2008 Service Pack 2. NVD's record lists the exact affected versions.
References
- msrc.microsoft.com/update-guide/vulnerability/CVE-2025-33073 Vendor Advisory
- www.vicarius.io/vsociety/posts/cve-2025-33073-detection-script-improper-access-control-in-windows-smb-affects-microsoft-products Third Party Advisory
- www.vicarius.io/vsociety/posts/cve-2025-33073-mitigation-script-improper-access-control-in-windows-smb-affects-microsoft-products MitigationThird Party Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-33073 US Government Resource
Questions
Is CVE-2025-33073 being exploited?
Yes. CISA added CVE-2025-33073 to its Known Exploited Vulnerabilities catalog on 2025-10-20, with a federal remediation due date of 2025-11-10.
How do I fix CVE-2025-33073?
CISA's 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.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.
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