CVE-2021-34484
Published: March 31, 2022
Official Description
Microsoft Windows User Profile Service contains an unspecified vulnerability that allows for privilege escalation.
CISA KEV Advisory
Microsoft Windows User Profile Service Privilege Escalation Vulnerability
Microsoft Windows User Profile Service contains an unspecified vulnerability that allows for privilege escalation.
Apply updates per vendor instructions.
Risk Analysis
This high-severity unspecified vulnerability in Microsoft Windows User Profile Service allows for privilege escalation. While no CVSS score is provided, its inclusion in CISA's KEV catalog and an EPSS score of 0.02429 confirm active exploitation, making it a critical issue.
This vulnerability is actively exploited in the wild and is listed in CISA's KEV catalog. The specific exploitation details are not provided, but it leads to privilege escalation.
Apply the latest security updates from Microsoft to patch the Windows User Profile Service. Regularly apply security updates to all Windows systems.
Technical Analysis
CVE-2021-34484 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CISA has added CVE-2021-34484 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.
Affected Vendors & Products
Exploit & PoC Resources
All References (1)
Quick Facts
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2021-34484 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
- !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
- !Active exploitation confirmed — treat as P1