Home/CVE/Microsoft Windows Installer Privilege Escalation Vulnerability
CVE

CVE-2021-41379

Microsoft Windows Installer Privilege Escalation Vulnerability

Windows Installer Elevation of Privilege Vulnerability.

MEDIUM · CVSS 5.5 ⚠ CISA KEV EPSS 0.01021 Ransomware: known
Act now
  • Listed on CISA KEV (known exploited in the wild)
  • Linked to known ransomware campaigns
  • SSVC exploitation status: active
Sigma rules0 YARA rules0
⬢

Required Remediation

Apply updates per vendor instructions.

⬡

Weakness Classification

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

Affected Products & Versions

18
microsoft windows 10 1507< 10.0.10240.19119
microsoft windows 10 1607< 10.0.14393.4770
microsoft windows 10 1809< 10.0.17763.2300
microsoft windows 10 1909< 10.0.18363.1916
microsoft windows 10 2004< 10.0.19041.1348
microsoft windows 10 20h2< 10.0.19042.1348
microsoft windows 10 21h1< 10.0.19043.1348
microsoft windows 11 21h2< 10.0.22000.318
▣

Scoring & Timeline

5.5
MEDIUM · CVSS v3.1 · secure@microsoft.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD10 Nov 2021 · 01:19 AM
CVSS VectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC triage · cisa-vulnrichment
Exploitation
active
Automatable
no
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

4
cisaKEV-CVE-2021-41379
msrcCVE-2021-41379Elevation of Privilege
splunk-security-contentccb98a66-5851-11ec-b91c-acde48001122
elastic-detectionelastic-detection-rules-windows-privilege_escalation_installertakeover
🔗

References & Sources

3
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-41379PatchVendor Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-1308/Third Party AdvisoryVDB Entry
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-41379US Government Resource
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