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CVE-2025-33073

Microsoft Windows SMB Client Improper Access Control

8.8 HIGHActively exploited (CISA KEV)EPSS 82.7%
  1. Published10 Jun 2025
  2. Added to CISA KEV20 Oct 2025
  3. Remediation due10 Nov 2025
Actively exploited (CISA KEV)

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.

Added to KEV: 20 Oct 2025Federal remediation due: 10 Nov 2025

Description

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

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

Microsoft Windows 10 1507< 10.0.10240.21034
Microsoft Windows 10 1607< 10.0.14393.8148
Microsoft Windows 10 1809< 10.0.17763.7434
Microsoft Windows 10 21h2< 10.0.19044.5965
Microsoft Windows 10 22h2< 10.0.19045.5965
Microsoft Windows 11 22h2< 10.0.22621.5472
Microsoft Windows 11 23h2< 10.0.22631.5472
Microsoft Windows 11 24h2< 10.0.26100.4270
Microsoft Windows Server 2008r2
Microsoft Windows Server 2012r2
Microsoft Windows Server 2016< 10.0.14393.8148
Microsoft Windows Server 2019< 10.0.17763.7434
Microsoft Windows Server 2022< 10.0.20348.3745
Microsoft Windows Server 2022 23h2< 10.0.25398.1665
Microsoft Windows Server 2025< 10.0.26100.4270

Remediation

Fixed in
Microsoft Windows 10 1507≥ 10.0.10240.21034
Microsoft Windows 10 1607≥ 10.0.14393.8148
Microsoft Windows 10 1809≥ 10.0.17763.7434
Microsoft Windows 10 21h2≥ 10.0.19044.5965
Microsoft Windows 10 22h2≥ 10.0.19045.5965
Microsoft Windows 11 22h2≥ 10.0.22621.5472
Microsoft Windows 11 23h2≥ 10.0.22631.5472
Microsoft Windows 11 24h2≥ 10.0.26100.4270
Microsoft Windows Server 2016≥ 10.0.14393.8148
Microsoft Windows Server 2019≥ 10.0.17763.7434

References

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Frequently asked

Is CVE-2025-33073 being actively exploited?

Yes. CVE-2025-33073 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 20 Oct 2025.

How severe is CVE-2025-33073?

CVE-2025-33073 has a CVSS 3.1 base score of 8.8, rated high. EPSS estimates a 82.7% probability of exploitation.

Which products are affected by CVE-2025-33073?

Affected products include Microsoft Windows 10 1507, Microsoft Windows 10 1607, Microsoft Windows 10 1809, Microsoft Windows 10 21h2, Microsoft Windows 10 22h2, and 10 more.

How do I fix CVE-2025-33073?

Upgrade affected software to a fixed version, for example Microsoft Windows 10 1507 10.0.10240.21034, Microsoft Windows 10 1607 10.0.14393.8148, Microsoft Windows 10 1809 10.0.17763.7434 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-33073 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.