high8.8Known exploitedPublic exploit code
CVE-2025-33073
Microsoft Windows SMB Client Improper Access Control Vulnerability
Exploited in the wild
This vulnerability is on the CISA Known Exploited Vulnerabilities list, added 2025-10-20. Federal due date: 2025-11-10.
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Public exploit code
Working exploit or proof of concept code has been published for this vulnerability. Treat unpatched systems as at risk.
- Windows 11 SMB Client - Privilege Escalation & Remote Code Execution (RCE)2025-06-15 · remote · windows
Impact
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.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Microsoft | Windows 10 1507 | before 10.0.10240.21034 |
| Microsoft | Windows 10 1607 | before 10.0.14393.8148 |
| Microsoft | Windows 10 1809 | before 10.0.17763.7434 |
| Microsoft | Windows 10 21h2 | before 10.0.19044.5965 |
| Microsoft | Windows 10 22h2 | before 10.0.19045.5965 |
| Microsoft | Windows 11 22h2 | before 10.0.22621.5472 |
| Microsoft | Windows 11 23h2 | before 10.0.22631.5472 |
| Microsoft | Windows 11 24h2 | before 10.0.26100.4270 |
| Microsoft | Windows Server 2008 | All versions Version r2 |
| Microsoft | Windows Server 2012 | All versions Version r2 |
| Microsoft | Windows Server 2016 | before 10.0.14393.8148 |
| Microsoft | Windows Server 2019 | before 10.0.17763.7434 |
Weakness classification
References
- NVD record
- CVE.org record
- CISA KEV catalog
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-33073
- https://www.vicarius.io/vsociety/posts/cve-2025-33073-detection-script-improper-access-control-in-windows-smb-affects-microsoft-products
- https://www.vicarius.io/vsociety/posts/cve-2025-33073-mitigation-script-improper-access-control-in-windows-smb-affects-microsoft-products
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-33073