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Exploited· due 2021-11-177.8highHighused in ransomware

CVE-2021-1732

Microsoft Windows 10 1803

Windows Win32k Elevation of Privilege Vulnerability

Exploitation status

  • CISA has confirmed this is being exploited in the wild. That is an observation of real attacks, not a prediction.
  • It is known to have been used in ransomware campaigns.
  • US federal civilian agencies are required to remediate it by 2021-11-17. That deadline does not bind private companies, but it is a reasonable benchmark for how urgently CISA views it.
  • A vendor advisory or patch reference has been published.

Required action

Apply updates per vendor instructions.

CISA’s wording, unedited.

What the metrics mean

  • It is requires local access to the machine.
  • For an attacker who can reach it, no special conditions are needed to exploit it.
  • To exploit it, an ordinary user account is needed.
  • Beyond that, no action by a user is required.

Scoring

CVSS
7.8 (v3.1)
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-787
Assigned by
secure@microsoft.com

Dates

Published
2021-02-25
Last modified
2026-08-12
Added to KEV
2021-11-03
Remediation due
2021-11-17
Sources
CISA KEV, NVD

Affected products

  • Microsoft Windows 10 1803all versions
  • Microsoft Windows 10 1809all versions
  • Microsoft Windows 10 1909all versions
  • Microsoft Windows 10 2004all versions
  • Microsoft Windows 10 20h2all versions
  • Microsoft Windows Server 1909all versions
  • Microsoft Windows Server 2004all versions
  • Microsoft Windows Server 2019all versions
  • Microsoft Windows Server 20h2all versions

As listed in the NVD configuration data. Not a statement about your estate.

References