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Fencer Intel
high 7.8

CVE-2021-34484 kev in the critical feed json

Windows User Profile Service Elevation of Privilege Vulnerability

published 5y ago modified 2mo ago also EUVD-2021-21139

cvss
7.8
version 3.1, CNA
cisa kev
Exploited
added 2022-03-31
epss
21.8%
EPSS 21.8% chance of exploitation in 30 days, percentile 97%
public exploits
0
none known

Summary

Windows User Profile Service Elevation of Privilege Vulnerability

Patch / fix

cisa required action Apply updates per vendor instructions.

  • Microsoft Windows 10 Version 1507 10.0.10240.19022
  • Microsoft Windows 10 Version 1607 10.0.14393.4583
  • Microsoft Windows 10 Version 1809 10.0.17763.2114
  • Microsoft Windows 10 Version 1909 10.0.18363.1734
  • Microsoft Windows 10 Version 2004 10.0.19041.1165
  • Microsoft Windows 10 Version 20H2 10.0.19042.1165
  • Microsoft Windows 10 Version 21H1 10.0.19043.1165
  • Microsoft Windows 7 6.1.7601.25685
  • Microsoft Windows 7 Service Pack 1 6.1.7601.25685
  • Microsoft Windows 8.1 6.3.9600.20094
  • Microsoft Windows Server 2008 R2 Service Pack 1 6.1.7601.25685
  • Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation) 6.1.7601.25685
  • Microsoft Windows Server 2008 Service Pack 2 6.0.6003.21192
  • Microsoft Windows Server 2008 Service Pack 2 (Server Core installation) 6.0.6003.21192
  • Microsoft Windows Server 2012 6.2.9200.23435
  • Microsoft Windows Server 2012 (Server Core installation) 6.2.9200.23435
  • Microsoft Windows Server 2012 R2 6.3.9600.20094
  • Microsoft Windows Server 2012 R2 (Server Core installation) 6.3.9600.20094
  • Microsoft Windows Server 2016 10.0.14393.4583
  • Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.4583
  • Microsoft Windows Server 2019 10.0.17763.2114
  • Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.2114
  • Microsoft Windows Server version 2004 10.0.19041.1165
  • Microsoft Windows Server version 20H2 10.0.19042.1165

Is CVE-2021-34484 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

Timeline

  1. Published
  2. Added to CISA KEV
  3. CISA patch deadline
  4. CISA SSVC: exploitation active

Known exploited

Added
4y ago
Patch by
2022-04-21 (4y ago)
Ransomware
Not known
Required action
Apply updates per vendor instructions.
Vendor, product
Microsoft, Windows
CISA name
Microsoft Windows User Profile Service Privilege Escalation Vulnerability

CISA SSVC

Exploitation
Active, exploited in the wild
Automatable
no
Technical impact
total
Assessed
last yr.

Exploit prediction

21.83% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 4.6 AV:L/AC:L/Au:N/C:P/I:P/A:P

Affected products

  • Microsoft Windows 10 Version 1507
  • Microsoft Windows 10 Version 1607
  • Microsoft Windows 10 Version 1809
  • Microsoft Windows 10 Version 1909
  • Microsoft Windows 10 Version 2004
  • Microsoft Windows 10 Version 20H2
  • Microsoft Windows 10 Version 21H1
  • Microsoft Windows 7
  • Microsoft Windows 7 Service Pack 1
  • Microsoft Windows 8.1
  • Microsoft Windows Server 2008 R2 Service Pack 1
  • Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation)
  • Microsoft Windows Server 2008 Service Pack 2
  • Microsoft Windows Server 2008 Service Pack 2 (Server Core installation)
  • Microsoft Windows Server 2012
  • Microsoft Windows Server 2012 (Server Core installation)
  • Microsoft Windows Server 2012 R2
  • Microsoft Windows Server 2012 R2 (Server Core installation)
  • Microsoft Windows Server 2016
  • Microsoft Windows Server 2016 (Server Core installation)
  • Microsoft Windows Server 2019
  • Microsoft Windows Server 2019 (Server Core installation)
  • Microsoft Windows Server version 2004
  • Microsoft Windows Server version 20H2

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.