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Fencer Vulns
high 7.8

CVE-2021-34516 json

Win32k Elevation of Privilege Vulnerability

published 2021-07-14 5 y ago modified 2026-08-10 2 mo ago also EUVD-2021-21170

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.3%
EPSS 1.3% chance of exploitation in 30 days, percentile 70%
public exploits
0
none known

Summary

Win32k Elevation of Privilege Vulnerability

Patch / fix

  • Microsoft Windows 10 Version 1507 10.0.10240.19003
  • Microsoft Windows 10 Version 1607 10.0.14393.4530
  • Microsoft Windows 10 Version 1809 10.0.17763.2061
  • Microsoft Windows 10 Version 1909 10.0.18363.1679
  • Microsoft Windows 10 Version 2004 10.0.19041.1110
  • Microsoft Windows 10 Version 20H2 10.0.19042.1110
  • Microsoft Windows 10 Version 21H1 10.0.19043.1110
  • Microsoft Windows 7 6.1.7601.25661
  • Microsoft Windows 7 Service Pack 1 6.1.7601.25661
  • Microsoft Windows 8.1 6.3.9600.20069
  • Microsoft Windows Server 2008 R2 Service Pack 1 6.1.7601.25661
  • Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation) 6.1.7601.25661
  • Microsoft Windows Server 2008 Service Pack 2 6.0.6003.21167
  • Microsoft Windows Server 2008 Service Pack 2 (Server Core installation) 6.0.6003.21167
  • Microsoft Windows Server 2012 6.2.9200.23409
  • Microsoft Windows Server 2012 (Server Core installation) 6.2.9200.23409
  • Microsoft Windows Server 2012 R2 6.3.9600.20069
  • Microsoft Windows Server 2012 R2 (Server Core installation) 6.3.9600.20069
  • Microsoft Windows Server 2016 10.0.14393.4530
  • Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.4530
  • Microsoft Windows Server 2019 10.0.17763.2061
  • Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.2061
  • Microsoft Windows Server version 2004 10.0.19041.1110
  • Microsoft Windows Server version 20H2 10.0.19042.1110

Exploit prediction

1.30% chance of exploitation in the next 30 days, higher than 70% of all scored CVEs (FIRST EPSS, 2026-11-08).

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

Classification

Weakness
  • CWE-20 Improper Input Validation

References

Sources

Fencer Vulns 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.