CVE-2025-33073 — Microsoft Windows SMB Client Improper Access Control Vulnerability
CVE-2025-33073: Microsoft Windows SMB Client Improper Access Control Vulnerability
CISA Known Exploited Vulnerability (KEV)
| Vendor / project | Microsoft |
| Product | Windows |
| Date added | 2025-10-20 |
| Due date | 2025-11-10 |
| Ransomware campaign use | Unknown |
Description
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.
Required action (CISA)
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Notes
https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2025-33073 ; https://nvd.nist.gov/vuln/detail/CVE-2025-33073
References
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-33073
- KEV catalog: https://www.cisa.gov/known-exploited-vulnerabilities-catalog