CVE-2025-33073
Actively exploited. CVE-2025-33073 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-10-20) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.
Public exploit code is available. Proof-of-concept or working exploit code for CVE-2025-33073 is indexed in Exploit-DB and GitHub PoC. Expect opportunistic scanning and exploitation attempts — prioritize remediation.
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
- 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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Exploitation outlook
- Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 99% of all EPSS-scored CVEs.
Exploit availability
Public exploit or proof-of-concept code for CVE-2025-33073 is indexed in these free datasets. Available exploit code raises real-world risk independent of the CVSS score.
- Exploit-DBA public exploit is published in the Exploit-DB archive.look it up ↗
- GitHub PoCPublic proof-of-concept repositories on GitHub reference this CVE.look it up ↗
Advisory coverage (1)
- criticalexploitedCVE-2025-33073: Microsoft Windows SMB Client Improper Access Control Vulnerabilitycisa-kev · 2025-10-20
External references
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[](https://www.csirts.com/cve/CVE-2025-33073)