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Vulnerability Intelligence

CVE-2021-41379

HighExploitedPublic exploit

Windows Installer Elevation of Privilege Vulnerability

Published Nov 30, 2021 · Updated Aug 19, 2026

Key Facts

Patch immediately
  • CVE-2021-41379 is a high-severity vulnerability (CVSS 7.8 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 Nov 30, 2021 and is known to be used in ransomware campaigns. Public exploit code is available.
  • EPSS estimates a 19% probability of exploitation in the next 30 days.
  • Fixed versions are available, including Windows 10 1507 10.0.10240.19119, Windows 10 1607 10.0.14393.4770, Windows 10 1809 10.0.17763.2300.
  • Brandefense priority: patch immediately, because it is listed as exploited in the wild.

CVSS v3.1

7.8

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

EPSS (30-day exploit likelihood)

19%

Higher than 97.3% 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-2021-41379 brief as a PDF

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

Description

Windows Installer Elevation of Privilege Vulnerability

Known-Exploited Catalog Listings

CatalogAddedRemediation dueRansomware use
CISA KEVMar 3, 2022Mar 17, 2022Known
Industry KEV feedNov 30, 2021Mar 17, 2022Known
CIRCL KEVMar 3, 2022Mar 17, 2022Known
ENISA EUVDMar 3, 2022n/aNot reported

Required action: Apply updates per vendor instructions.

Affected Products

96 affected entries in total
ProductAffected versionsFixed in
Windows 10 1507Microsoft10.0.10240.1911910.0.10240.19119
Windows 10 1607Microsoft10.0.14393.477010.0.14393.4770
Windows 10 1809Microsoft10.0.17763.2300, 10.0.18363.1916, 10.0.19041.134810.0.17763.2300
Windows 10 1909Microsoft10.0.18363.191610.0.18363.1916
Windows 10 2004MicrosoftSee advisory10.0.19041.1348
20 more affected products in the full CVE brief

Patched Releases

Windows 10 1507

10.0.10240.19119

Windows 10 1607

10.0.14393.4770

Windows 10 1809

10.0.17763.2300, 10.0.18363.1916, 10.0.19041.1348

Windows 10 1909

10.0.18363.1916

Windows 10 2004

10.0.19041.1348

windows 10 20H2

10.0.19042.1348

windows 10 21H1

10.0.19043.1348

windows 11 21H2

10.0.22000.318

Windows 7

6.1.7601.25769

Windows 8.1

6.3.9600.20174

Windows Rt 8.1

6.3.9600.20174

Windows Server 2004

10.0.19041.1348

windows server 2008 R2

6.1.7601.25769

Windows Server 2008 Sp2

6.0.6003.21282

Windows Server 2012

6.2.9200.23517

windows server 2012 R2

6.3.9600.20174

Windows Server 2016

10.0.14393.4770

Windows Server 2019

10.0.17763.2300

Windows Server 2022

10.0.20348.350

windows server 20H2

10.0.19042.1348

Windows 10 Version 1507

10.0.10240.19119

Windows 10 Version 1607

10.0.14393.4770

Windows 10 Version 1809

10.0.17763.2300

Windows 10 Version 1909

10.0.18363.1916

Windows 10 Version 2004

10.0.19041.1348

Timeline

  1. Publicly disclosed

    Nov 30, 2021

  2. Added to Industry KEV feed

    Nov 30, 2021

  3. Added to CISA KEV

    Mar 3, 2022

  4. Added to CIRCL KEV

    Mar 3, 2022

  5. Added to ENISA EUVD

    Mar 3, 2022

  6. Last updated

    Aug 19, 2026

Weakness Type

  • CWE-59 Improper Link Resolution Before File Access ('Link Following')

References

15 more references in the full CVE brief

FAQ

Common Questions.

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