CVE-2021-41379 Microsoft CVE debrief

Who should care

Windows administrators, endpoint security teams, vulnerability management teams, and incident responders should prioritize this issue, especially on systems where local privilege escalation would materially increase attacker access.

Technical summary

The available official sources identify the issue as a Microsoft Windows Installer privilege escalation vulnerability affecting Windows. CISA’s KEV entry confirms it as known exploited, with required action to apply updates per vendor instructions. The source metadata also marks known ransomware campaign use as "Known". No further technical details are provided in the supplied corpus.

Defensive priority

High. CISA added the vulnerability to KEV on 2022-03-03 and set a remediation due date of 2022-03-17, indicating urgent patching expectations for affected Windows systems.

Recommended defensive actions

• Apply the Microsoft updates referenced by vendor guidance as soon as possible.
• Prioritize internet-exposed, high-value, and privilege-sensitive Windows systems.
• Verify patch deployment across endpoints and servers that use Windows Installer components.
• Monitor for signs of unauthorized privilege escalation and anomalous administrative activity.
• Use vulnerability management reporting to confirm remediation before the KEV due date and continue to track any affected assets.

Evidence notes

CISA’s Known Exploited Vulnerabilities feed lists "Microsoft Windows Microsoft Windows Installer Privilege Escalation Vulnerability" with vendorProject Microsoft, product Windows, dateAdded 2022-03-03, dueDate 2022-03-17, requiredAction "Apply updates per vendor instructions.", and knownRansomwareCampaignUse "Known". The supplied official NVD and CVE.org links are included for record validation, but no additional details were provided in the corpus.

Official resources