CVE-2021-41379
KEVRansomware UseMicrosoft Windows Installer Privilege Escalation Vulnerability
Description
Microsoft Windows Installer contains an unspecified vulnerability that allows for privilege escalation.
Windows Installer Elevation of Privilege Vulnerability
CVSS 3.1 vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HPublishedNov 10, 2021
Last modifiedAug 19, 2026
Added to KEVMar 3, 2022
Remediation dueMar 17, 2022
References
- msrc.microsoft.com/update-guide/vulnerability/CVE-2021-41379PatchVendor Advisory
- portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-41379PatchVendor Advisory
- zerodayinitiative.com/advisories/ZDI-21-1308/Third Party AdvisoryVDB Entry
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-41379US Government Resource
0 recent articles mention this CVE
69
Risk assessment · High
Actively exploited and used by ransomware crews. Patch immediately.
- Exploitation
- Confirmed in the wild (CISA KEV)
- Federal remediation deadline
- Overdue by 1685 days
- Ransomware
- Used in known ransomware campaigns
- CVSS
- 5.5 MEDIUM
- EPSS (30-day exploit probability)
- 19.5% · top 3% of all CVEs
- Weakness
- CWE-59
Recommended actions
- 1.Apply updates per vendor instructions.
- 2.Treat as emergency change: patch or isolate internet-facing instances first.
- 3.Hunt for compromise: review logs for the disclosure window, not just from the patch date.
- 4.Verify offline/immutable backups and segment the affected systems. This flaw is used for ransomware initial access.
Assessment is derived automatically from the live signals above; verify against your own asset inventory.