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Vulnerabilities

Vulnerability · CVE-2021-28310

Microsoft Win32k Privilege Escalation Vulnerability

Published Apr 13, 2021 · catalog updated Jun 16, 2026 · Microsoft Win32k

Patch now

CVE-2021-28310 is in the CISA known-exploited catalog, due Nov 17, 2021. Confirm Microsoft Win32k against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
Severity
High7.8
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
8.40%
Remediation
Remediation guidance
Affected products
cpe microsoft/windows 10 1803 · cpe microsoft/windows 10 1809 · cpe microsoft/windows 10 1909 · cpe microsoft/windows 10 2004 · cpe microsoft/windows 10 20h2 · cpe microsoft/windows server 1909

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

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe microsoft/windows 10 1803version unspecified
  • cpe microsoft/windows 10 1809version unspecified
  • cpe microsoft/windows 10 1909version unspecified
  • cpe microsoft/windows 10 2004version unspecified
  • cpe microsoft/windows 10 20h2version unspecified
  • cpe microsoft/windows server 1909version unspecified
  • cpe microsoft/windows server 2004version unspecified
  • cpe microsoft/windows server 2019version unspecified
  • vendor Microsoft Win32kversion unspecified

How to fix CVE-2021-28310

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2021-28310 is in the CISA known-exploited catalog, due Nov 17, 2021. Confirm Microsoft Win32k against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Affected version ranges are not on this record. Apply updates per vendor instructions.

What should an analyst verify?

CWE-787: Out-of-bounds Write. EPSS 8.40%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Windows security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 13, 2021 · Catalog

    Detected

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

  2. Nov 3, 2021 · CISA KEV

    Known exploited

    Apply updates per vendor instructions.

  3. Nov 17, 2021 · CISA KEV

    Remediation due

    Apply updates per vendor instructions.

  4. Jun 16, 2026 · Catalog

    Updated

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

Sources

  • CISA KEVConfirmed exploitationCVE-2021-28310

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

    cisa.gov
  • CVE.orgVulnerability recordCVE-2021-28310

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2021-28310

    30-day exploitation probability 8.4%

    first.org
  • NIST NVDVulnerability recordCVE-2021-28310

    Win32k Elevation of Privilege Vulnerability

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-2021-28310

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

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.