5.5

CVE-2021-41379: Microsoft Windows Installer Privilege Escalation Vulnerability

CVSS: 5.5v3.1MediumKEVRansomwareAnalyzed
Published 10-11-2021Last modified 19-08-2026
Open JSON

Vulnerability summary

CVE-2021-41379 is a medium (CVSS 5.5) Link Following vulnerability in Microsoft Windows. It is known to be exploited: CISA lists it, first on 03-03-2022. It has been used in ransomware campaigns. EPSS estimates a 19.45% chance of exploitation in the next 30 days, higher than 97.3% of scored vulnerabilities.

Overall risk
90/100
0100
Critical · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
19.45%
0%100%
Medium · -0.08 pp in 30 days
KEVListedCISA
RansomwareKnown useFlagged by CISA
Public exploits0No public exploits recorded

Timeline

  1. 10-11-2021
    PublishedVulnerability first disclosed.
  2. 03-03-2022
    Added to CISA KEVMicrosoft Windows Installer Privilege Escalation Vulnerability
  3. 17-03-2022
    CISA remediation dueApply updates per vendor instructions.
  4. 19-08-2026
    Last modifiedVulnerability information updated.

Description

Windows Installer Elevation of Privilege Vulnerability

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

19.45%

Chance of exploitation in the next 30 days

Percentile

97%

Versus all other CVEs

30-day change

-0.08 pp

From 19.53% on 19-09-2026

19-09-202619-10-2026
EPSS score
19.45%

Known exploited

Compare KEV catalogs
CISA KEVListed
Added
03-03-2022
Federal due date
17-03-2022
Ransomware

CISA required action

Apply updates per vendor instructions. nvd.nist.gov/vuln/detail/CVE-2021-41379

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Microsoft38 products

1 vendor · 38 products

References

4 links