CVE-2021-34484VulnerabilityPublished 03/31/2022Updated 10/24/2026

CVE-2021-34484: Microsoft Windows User Profile Service Privilege Escalation Vulnerability

Affects Microsoft WindowsSource CISA KEV

Severity

High

No CVSS score published yet

Exploitation: Actively exploited – in CISA KEV since 03/31/2022
KEV deadline: 04/21/2022
EPSS: 21.8% chance of exploitation in 30 days – higher than 97% of CVEs

What to do

CISA required action

Apply updates per vendor instructions.

nvd.nist.gov/vuln/detail/CVE-2021-34484 (opens in a new tab)

Description

CVE-2021-34484 is a high-severity privilege escalation vulnerability in the Microsoft Windows User Profile Service. It allows an attacker to gain elevated privileges on affected systems. The vulnerability has been exploited in the wild. No specific affected versions or patch information is provided in the available data.

Summary

Microsoft Windows User Profile Service contains an unspecified vulnerability (CVE-2021-34484) that enables privilege escalation. The vulnerability has been confirmed to be exploited in the wild, indicating active threat usage. No detailed technical information or affected version ranges are provided. No patch or remediation details are included in the source data.

Impact

Successful exploitation of this vulnerability allows an attacker to escalate privileges on a Windows system, potentially gaining higher-level access than intended. This can lead to unauthorized actions and compromise of system integrity.

Mitigation

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no patch or official fix information is provided, users should monitor Microsoft security advisories for updates and apply any released patches promptly.

Weaknesses

CWE-269Improper Privilege Management (opens in a new tab)

What to do

Description

AnalysisAI-generated, updated 10/24/2026, 11:25:30 UTC

Weaknesses

References

Related threats