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CVE-2025-33073: Microsoft Windows SMB Client Improper Access Control Vulnerability

criticalknown exploitedpublic exploitCVE-2025-33073
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
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.

CSIRTS triage

vendor: Microsoftproduct: Windows SMB ClientPrivilege escalation
What
An improper access control vulnerability could allow for privilege escalation.
Who is affected
Deployments of Microsoft Windows SMB Client.
Urgency
Immediate remediation is necessary due to active exploitation and critical severity.
Action
Install the latest updates from Microsoft.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2025-10-20
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2025-33073

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2025-33073coverage & exploitation statusNVD · CVE.org

Recent advisories for Microsoft Windows SMB

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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