CVE WatchAug 10, 2026

CVE-2021-34484

Microsoft Windows User Profile Service Privilege Escalation Vulnerability

CVSS

7.8

High

EPSS

21.8%

p98

KEV

YES

Mar 31, 2022

Exploit Today

0-100

Published: Aug 12, 2021 · Last modified: Aug 10, 2026

EPSS · 30d

21.8%EPSS · 30 days21.8%

2026-09-172026-10-14

KEV catalog record

Product

Microsoft / Windows

Vulnerability

Microsoft Windows User Profile Service Privilege Escalation Vulnerability

Added to KEV

Mar 31, 2022

Remediate by

Apr 21, 2022

Known ransomware use

Summary description

Microsoft Windows User Profile Service contains an unspecified vulnerability that allows for privilege escalation.

Required action

Apply updates per vendor instructions.

Notes

https://nvd.nist.gov/vuln/detail/CVE-2021-34484

Technical description

Windows User Profile Service Elevation of Privilege Vulnerability

Official references

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