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Vulnerability Intelligence

CVE-2025-33073

HighExploitedPublic exploit

Windows SMB Client Elevation of Privilege Vulnerability

Published Jun 9, 2025 · Updated Feb 26, 2026

Key Facts

Patch immediately
  • CVE-2025-33073 is a high-severity vulnerability (CVSS 8.8 v3.1) affecting Windows 10 1507 (Microsoft), Windows 10 1607 (Microsoft), Windows 10 1809 (Microsoft) and 22 more products.
  • It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Oct 9, 2025 and is known to be used in ransomware campaigns. Public exploit code is available.
  • EPSS estimates a 83% probability of exploitation in the next 30 days.
  • Fixed versions are available, including Windows 10 1507 10.0.10240.21034, Windows 10 1607 10.0.14393.8148, Windows 10 1809 10.0.17763.7434.
  • Brandefense priority: patch immediately, because it is listed as exploited in the wild.

CVSS v3.1

8.8

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS (30-day exploit likelihood)

83%

Higher than 99.6% of all scored CVEs

Exploited in the wild

Yes

4 catalog listings, used by ransomware

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2025-33073 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

Description

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

Known-Exploited Catalog Listings

CatalogAddedRemediation dueRansomware use
CISA KEVOct 20, 2025Nov 10, 2025Not reported
Industry KEV feedOct 9, 2025Nov 10, 2025Known
CIRCL KEVOct 20, 2025Nov 10, 2025Not reported
ENISA EUVDOct 20, 2025n/aNot reported

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.

Affected Products

49 affected entries in total
ProductAffected versionsFixed in
Windows 10 1507MicrosoftSee advisory10.0.10240.21034
Windows 10 1607MicrosoftSee advisory10.0.14393.8148
Windows 10 1809MicrosoftSee advisory10.0.17763.7434
Windows 10 21h2MicrosoftSee advisory10.0.19044.5965
Windows 10 22h2MicrosoftSee advisory10.0.19045.5965
20 more affected products in the full CVE brief

Patched Releases

Windows 10 1507

10.0.10240.21034

Windows 10 1607

10.0.14393.8148

Windows 10 1809

10.0.17763.7434

Windows 10 21h2

10.0.19044.5965

Windows 10 22h2

10.0.19045.5965

Windows 11 22h2

10.0.22621.5472

Windows 11 23h2

10.0.22631.5472

Windows 11 24h2

10.0.26100.4270

Windows Server 2016

10.0.14393.8148

Windows Server 2019

10.0.17763.7434

Windows Server 2022

10.0.20348.3745, 10.0.20348.3807

Windows Server 2022 23h2

10.0.25398.1665

Windows Server 2025

10.0.26100.4270, 10.0.26100.4349

python311-impacket

0.13.1-1.1

python313-impacket

0.13.1-1.1

python314-impacket

0.13.1-1.1

Windows 10 Version 1507

10.0.10240.21034

Windows 10 Version 1607

10.0.14393.8148

Windows 10 Version 1809

10.0.17763.7434

Windows 10 Version 21H2

10.0.19044.5965

Windows 10 Version 22H2

10.0.19045.5965

Windows 11 version 22H2

10.0.22621.5472

Windows 11 version 22H3

10.0.22631.5472

Windows 11 Version 23H2

10.0.22631.5472

Windows 11 Version 24H2

10.0.26100.4349

Timeline

  1. Publicly disclosed

    Jun 9, 2025

  2. Added to Industry KEV feed

    Oct 9, 2025

  3. Added to CISA KEV

    Oct 20, 2025

  4. Added to CIRCL KEV

    Oct 20, 2025

  5. Added to ENISA EUVD

    Oct 20, 2025

  6. Last updated

    Feb 26, 2026

Weakness Type

  • CWE-284 Improper Access Control

References

7 more references in the full CVE brief

FAQ

Common Questions.

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