Microsoft Windows SMB Client Improper Access Control Vulnerability

HOCH 8.8EXPLOITED (CISA KEV)CVE-2025-33073 · Published 10/06/2025 · updated 17/06/2026

Microsoft Windows SMB Client Improper Access Control Vulnerability. Actively exploited: CISA added this vulnerability to its Known Exploited Vulnerabilities catalog on 20/10/2025. Patch affected systems as an emergency.

Kurz gesagt

CVE-2025-33073 ist eine Schwachstelle (HOCH (CVSS 8.8)).
Wird aktiv ausgenutzt: CISA hat sie am 20/10/2025 in den KEV-Katalog aufgenommen.
Wahrscheinlichkeit einer Ausnutzung in den nächsten 30 Tagen (EPSS): 82.7%, höher als bei 99.7% aller Schwachstellen.
Noch keine gepatchte Version bekannt: Herstellerhinweise unter Referenzen verfolgen.

Package	Affected versions	Patched versions
Windows Microsoft	Versions not published yet (product named by CISA KEV)

Description

Improper access control in Windows SMB allows an authorized attacker to elevate privileges over a network.

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2025-33073 · Vendor Advisory
vicarius.io/vsociety/posts/cve-2025-33073-detection-script-improper-access-control-in-windows-smb-affects-microsoft-products · Third Party Advisory
vicarius.io/vsociety/posts/cve-2025-33073-mitigation-script-improper-access-control-in-windows-smb-affects-microsoft-products · Mitigation
cisa.gov/known-exploited-vulnerabilities-catalog · US Government Resource
CISA KEV · CVE-2025-33073

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