CVE-2021-41379

Windows Installer Elevation of Privilege Vulnerability

MEDIUM

5.5

CVSS Score

Published: November 10, 2021 at 12:46 AM UTC

Updated: August 19, 2026 at 07:35 PM UTC

18 products affected across 1 vendorWindows Server 2016Windows Server 2019Windows Server 2012

Using Windows 10 Version 1809 by Microsoft?

Get instant alerts when new vulnerabilities affect Windows 10 Version 1809 - before attackers find them.

Real-time alertsTrack your software stackFree plan available

Start Free Sign In

Severity

MEDIUM5.5

Exploitation

CISA KEV

Exploit prediction

EPSS 19%

SSVC

Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score19.5%

EPSS (Exploit Prediction Scoring System) estimates a 19.5% chance this CVE is exploited in the wild within the next 30 days — higher than 97% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

Microsoft Windows Installer contains an unspecified vulnerability that allows for privilege escalation.

Required Action

Apply updates per vendor instructions.

Ransomware Use

Known

Added to KEV

Mar 3, 2022

Remediation Due

Mar 17, 2022

1686 days overdue

Notes

https://nvd.nist.gov/vuln/detail/CVE-2021-41379

Description

Windows Installer Elevation of Privilege Vulnerability

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Windows 10 1507 · Microsoft

95%

v < 10.0.10240.1911910.0.10240.0 ≤ v < 10.0.10240.1911910.0.10240.0

Affected range stops below 10.0.10240.19119, so it looks safe — our inference, not a vendor statement

Windows 10 1607 · Microsoft

95%

v < 10.0.14393.477010.0.14393.0 ≤ v < 10.0.14393.477010.0.14393.0

Affected range stops below 10.0.14393.4770, so it looks safe — our inference, not a vendor statement

Windows 10 1809 · Microsoft

95%

v < 10.0.17763.230010.0.0 ≤ v < 10.0.17763.230010.0.0 ≤ v < 10.0.19041.134810.0.17763.0 ≤ v < 10.0.17763.230010.0.0 10.0.17763.0

Affected range stops below 10.0.17763.2300, so it looks safe — our inference, not a vendor statement

Affected range stops below 10.0.19041.1348, so it looks safe — our inference, not a vendor statement

Windows 10 1909 · Microsoft

95%

v < 10.0.18363.191610.0.0 ≤ v < 10.0.18363.191610.0.0

Affected range stops below 10.0.18363.1916, so it looks safe — our inference, not a vendor statement

Windows 10 2004 · Microsoft

95%

v < 10.0.19041.134810.0.0 ≤ v < 10.0.19041.134810.0.0

Affected range stops below 10.0.19041.1348, so it looks safe — our inference, not a vendor statement

Windows 10 20H2 · Microsoft

95%

v < 10.0.19042.134810.0.0 ≤ v < 10.0.19042.134810.0.0

Affected range stops below 10.0.19042.1348, so it looks safe — our inference, not a vendor statement

Windows 10 21H1 · Microsoft

95%

v < 10.0.19043.134810.0.0 ≤ v < 10.0.19043.134810.0.0

Affected range stops below 10.0.19043.1348, so it looks safe — our inference, not a vendor statement

Windows 11 21H2 · Microsoft

95%

v < 10.0.22000.31810.0.22000.0 ≤ v < 10.0.22000.31810.0.22000.0

Affected range stops below 10.0.22000.318, so it looks safe — our inference, not a vendor statement

Windows 7 · Microsoft

95%

6.1.0 ≤ v < 6.1.7601.257696.1.0sp1

Affected range stops below 6.1.7601.25769, so it looks safe — our inference, not a vendor statement

Windows 8-1 · Microsoft

95%

6.3.0 ≤ v < 6.3.9600.201746.3.0

Affected range stops below 6.3.9600.20174, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (4)

PatchVendor Advisory

Source: [email protected]

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-41379

Third Party AdvisoryVDB Entry

Source: [email protected]

https://www.zerodayinitiative.com/advisories/ZDI-21-1308/

Vendor AdvisoryPatch

Source: cverecord

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-41379

US Government Resource

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-41379

SSVC — Action Prioritization

SSVCActiveNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.5MEDIUMmicrosoft

Vector?

Quick Info

StatusANALYZED

CWE

CWE-59

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Create account Sign in

Free plan, no card