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CVE-2021-1732

Microsoft Win32k Privilege Escalation

7.8 HIGHActively exploited (CISA KEV)Used in ransomwarePublic exploitEPSS 78.4%
  1. Published25 Feb 2021
  2. Added to CISA KEV3 Nov 2021
  3. Remediation due17 Nov 2021
Actively exploited (CISA KEV)

Microsoft Win32k contains an unspecified vulnerability that allows for privilege escalation.

Added to KEV: 3 Nov 2021Federal remediation due: 17 Nov 2021Used in ransomware

Description

Windows Win32k Elevation of Privilege Vulnerability

CVSS 3.1 breakdown

Attack vectorLocal
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

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Frequently asked

Is CVE-2021-1732 being actively exploited?

Yes. CVE-2021-1732 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 3 Nov 2021. It has been used in ransomware campaigns.

How severe is CVE-2021-1732?

CVE-2021-1732 has a CVSS 3.1 base score of 7.8, rated high. EPSS estimates a 78.4% probability of exploitation.

Which products are affected by CVE-2021-1732?

Affected products include Microsoft Windows 10 1803, Microsoft Windows 10 1809, Microsoft Windows 10 1909, Microsoft Windows 10 2004, Microsoft Windows 10 20h2, and 4 more.

How do I fix CVE-2021-1732?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2021-1732 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, a risk for it never ranks below high, and the update that fixes it moves to the Emergency patch lane. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.