Actively exploited
Listed in CISA’s Known Exploited Vulnerabilities catalog since October 20, 2025.
CVE-2025-33073
Microsoft Windows SMB Client Improper Access Control Vulnerability
Added to KEV October 20, 2025
Alert details
- Source feed
- CISA KEV
- CVE ID
- CVE-2025-33073
- CWE
- CWE-284
- Affected products
- Windows · Microsoft Windows · Microsoft
What happened
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.
What it means for your business
Microsoft Windows is listed in CISA's Known Exploited Vulnerabilities catalog (CVE-2025-33073). 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. CISA remediation due date: 2025-11-10. If you need help checking exposure, call (864) 335-9223.
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.
CISA due date: November 10, 2025
Sources
Related briefs
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