CVE-2021-28310VulnerabilityPublished 11/03/2021Updated 10/24/2026

CVE-2021-28310: Microsoft Win32k Privilege Escalation Vulnerability

Affects Microsoft Win32kSource CISA KEV

Severity

High

No CVSS score published yet

Exploitation: Actively exploited – in CISA KEV since 11/03/2021
KEV deadline: 11/17/2021
EPSS: 8.4% chance of exploitation in 30 days – higher than 94% of CVEs

What to do

CISA required action

Apply updates per vendor instructions.

nvd.nist.gov/vuln/detail/CVE-2021-28310 (opens in a new tab)

Description

CVE-2021-28310 is a high-severity privilege escalation vulnerability in the Microsoft Windows Win32k component. It involves an unspecified flaw that allows attackers to elevate their privileges on affected systems. The vulnerability has been exploited in the wild. No specific affected versions or patch information is provided in the available data.

Summary

Microsoft Windows Win32k contains an unspecified vulnerability (CVE-2021-28310) that enables privilege escalation. The vulnerability is classified under CWE-787 (Out-of-bounds Write). It has been confirmed as exploited in the wild, indicating active threat usage. However, no detailed technical information or patch status is available from the provided data.

Impact

Successful exploitation of this vulnerability allows attackers to escalate privileges on affected Windows systems, potentially enabling them to execute code with elevated rights. This can lead to further compromise of the system's security posture. The vulnerability has been observed in active exploitation campaigns.

Mitigation

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no patch or official fix information is provided, organizations should monitor Microsoft security advisories for updates and apply any released patches promptly. Until a fix is available, consider restricting access to vulnerable systems and applying standard privilege management controls.

Weaknesses

CWE-787Out-of-bounds Write (opens in a new tab)

What to do

Description

AnalysisAI-generated, updated 10/24/2026, 09:12:08 UTC

Weaknesses

References

Related threats