Microsoft Windows Installer Privilege Escalation Vulnerability

MEDIUM 5.5EXPLOITED (CISA KEV)CVE-2021-41379 · Published 10/11/2021 · updated 19/08/2026

Microsoft Windows Installer Privilege Escalation Vulnerability. Actively exploited: CISA added this vulnerability to its Known Exploited Vulnerabilities catalog on 03/03/2022. Patch affected systems as an emergency. It is known to be used in ransomware campaigns.

Package	Affected versions	Patched versions
Windows Microsoft	Versions not published yet (product named by CISA KEV)

Description

Windows Installer Elevation of Privilege Vulnerability

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2021-41379 · Patch
portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-41379 · Patch
zerodayinitiative.com/advisories/ZDI-21-1308 · Third Party Advisory
cisa.gov/known-exploited-vulnerabilities-catalog · US Government Resource
CISA KEV · CVE-2021-41379

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