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

CVE-2021-34484 · Severity: critical · CVSS 7.8 · Exploited in the wild · Published 2022-03-31

The Microsoft Windows User Profile Service contains an elevation of privilege vulnerability that allows a local attacker to gain SYSTEM privileges. The vulnerability has been observed being exploited in the wild and is included in CISA's Known Exploited Vulnerabilities catalog.

Technologies: Microsoft Windows. Vendors: Microsoft.

Quick answers

Is CVE-2021-34484 exploited in the wild?
Yes. CVE-2021-34484 is known to be exploited in the wild, first recorded on 31 March 2022. Treat it as urgent.
How severe is CVE-2021-34484?
Critical severity, with a CVSS score of 7.8, published 31 March 2022.
Which products and versions are affected?
Microsoft Windows 10 up to (excluding) 10.0.10240.19022; Microsoft Windows 7 Service Pack 1; Microsoft Windows 8.1; Microsoft Windows Server 2008 Service Pack 2; and 3 more.
Is there a fix for CVE-2021-34484?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2021-34484 attacked?
It is attacked with local access, in an operating system.
Am I affected by CVE-2021-34484?
Check whether you run Microsoft Windows. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Affected products

  • Microsoft Windows 10 up to (excluding) 10.0.10240.19022
  • Microsoft Windows 7 Service Pack 1
  • Microsoft Windows 8.1
  • Microsoft Windows Server 2008 Service Pack 2
  • Microsoft Windows Server 2012
  • Microsoft Windows Server 2016 up to (excluding) 10.0.14393.4583
  • Microsoft Windows Server 2019 up to (excluding) 10.0.17763.2114

Timeline

  • 2021-08-23: disclosed: Initial analysis by NIST and CVSS assignment.
  • 2022-03-31: kev added: Added to CISA Known Exploited Vulnerabilities Catalog.
  • 2022-03-31: advisory: NVD publication date.

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.