Live › vulnerability › CVE-2025-33073
Go to dashboardWindows SMB client has an improper access control flaw that lets an attacker escalate privileges on a Windows machine. A crafted script can make the victim machine connect back over SMB and authenticate to the attacker, which can expose credentials for relay or theft.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 19:11 UTC, 5h before NVD. All times on this page are UTC.
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
| Product | Ecosystem | Affected | Fixed in |
|---|---|---|---|
| Microsoft Windows | vendor | – | – |
| microsoft windows 10 1507 | vendor | < 10.0.10240.21034 | 10.0.10240.21034 |
| microsoft windows 10 1607 | vendor | < 10.0.14393.8148 | 10.0.14393.8148 |
| microsoft windows 10 1809 | vendor | < 10.0.17763.7434 | 10.0.17763.7434 |
| microsoft windows 10 21h2 | vendor | < 10.0.19044.5965 | 10.0.19044.5965 |
| microsoft windows 10 22h2 | vendor | < 10.0.19045.5965 | 10.0.19045.5965 |
| microsoft windows 11 22h2 | vendor | < 10.0.22621.5472 | 10.0.22621.5472 |
| microsoft windows 11 23h2 | vendor | < 10.0.22631.5472 | 10.0.22631.5472 |
| microsoft windows 11 24h2 | vendor | < 10.0.26100.4270 | 10.0.26100.4270 |
| microsoft windows server 2008 | vendor | – | – |
| microsoft windows server 2008 | vendor | = r2 | – |
| microsoft windows server 2012 | vendor | – | – |
| microsoft windows server 2012 | vendor | = r2 | – |
| microsoft windows server 2016 | vendor | < 10.0.14393.8148 | 10.0.14393.8148 |
| microsoft windows server 2019 | vendor | < 10.0.17763.7434 | 10.0.17763.7434 |
| microsoft windows server 2022 | vendor | < 10.0.20348.3745 | 10.0.20348.3745 |
| microsoft windows server 2022 23h2 | vendor | < 10.0.25398.1665 | 10.0.25398.1665 |
| microsoft windows server 2025 | vendor | < 10.0.26100.4270 | 10.0.26100.4270 |
Unknown from the sources.
Apply the Microsoft mitigations for CVE-2025-33073 and install the current Windows security update; the exact patch version is not in the sources.
Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
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 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.
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