October 20, 2025 · Applied Cybernetics Group
CVE-2025-33073 — Microsoft Windows
Microsoft Windows SMB Client Improper Access Control Vulnerability
- Added to KEV
2025-10-20- Federal due date
2025-11-10- Vendor
- Microsoft
- Product
- Windows
- EPSS
- 99.2th percentile (score 0.650, as of
2026-07-13) - NVD CVSS v3.1
- —
- Ransomware use
- Unknown
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2025-33073
CISA short 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
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.