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

criticalknown exploitedpublic exploitCVE-2021-34484
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Microsoft Windows User Profile Service contains an unspecified vulnerability that allows for privilege escalation.

CSIRTS triage

vendor: Microsoftproduct: WindowsPrivilege escalation
What
Microsoft Windows User Profile Service contains an unspecified vulnerability that allows for privilege escalation.
Who is affected
Users of Microsoft Windows are affected by this vulnerability.
Urgency
Remediation is urgent as the vulnerability is actively exploited and has critical severity.
Action
Install the latest security updates provided by Microsoft.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2022-03-31
Exploitation
Observed in the wild (CISA KEV)

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

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2021-34484coverage & exploitation statusNVD · CVE.org

Recent advisories for Microsoft Windows User

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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