Actively exploited in the wild
Microsoft Windows SMB Client Improper Access Control Vulnerability
Microsoft - Windows · Listed in the CISA KEV since 2025-10-20. This indicates confirmed attacks in production environments.
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.
CVE-2025-33073
HighCVSS 8.8KEVSummary
Improper access control in Windows SMB allows an authorized attacker to elevate privileges over a network.
Risk Assessment
An authorized user could elevate privileges over the network, potentially leading to system or network compromise.
Recommendation
Apply security updates provided by Microsoft for Windows SMB.
Other vulnerabilities in Windows SMB
See all- CVE-2026-58531High
A race condition exists in Windows SMB during concurrent execution using a shared resource. An authenticated attacker can elevate privileges over the network.
- CVE-2026-50690Medium
Use of an uninitialized resource in Windows SMB allows an authorized attacker to disclose information locally.
- CVE-2026-54997Medium
A vulnerability in Windows SMB allows an authorized attacker to disclose information locally by using an uninitialized resource.
- CVE-2026-49801Medium
Use of uninitialized resource in Windows SMB allows an authorized attacker to disclose information locally.
- CVE-2021-36974High
Vulnerability in Windows SMB allows elevation of privilege. An attacker could exploit this flaw to gain higher privileges on the system.
- CVE-2021-36972Medium
Information disclosure vulnerability in Windows SMB. It may allow an attacker to access information that should be protected.
- CVE-2021-36960High
Information disclosure vulnerability in Windows SMB. Could lead to data exposure.
- CVE-2021-33783Medium
Information disclosure vulnerability in Windows SMB. Could allow access to sensitive data transmitted over SMB.
Original NVD description (English source)
Improper access control in Windows SMB allows an authorized attacker to elevate privileges over a network.