Actively exploited · Published Jun 10, 2025 · Assigned by microsoft
CVE-2025-33073Windows SMB Client Elevation of Privilege Vulnerability
High 8.8 Exploited
In plain English
A high-severity improper access control in Windows 10 Version 1507 from Microsoft. Attackers are actively exploiting it in the wild (listed by CISA on October 20, 2025). The chance it is exploited in the next 30 days is estimated at 82.8% (higher than 99.7% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
CISA guidance
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Federal agencies must remediate by Nov 10, 2025.
Official description
Improper access control in Windows SMB allows an authorized attacker to elevate privileges over a network.
Affected products (as reported)
Weakness: CWE-284 · Vector: 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
References
- Windows SMB Client Elevation of Privilege Vulnerability vendor-advisory, patch
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-33073 government-resource
- 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