CVE-2021-1732VulnerabilityPublished 11/03/2021Updated 10/24/2026

CVE-2021-1732: 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
Ransomware: Used in ransomware campaigns
EPSS: 78.4% chance of exploitation in 30 days – higher than 99% of CVEs

What to do

CISA required action

Apply updates per vendor instructions.

nvd.nist.gov/vuln/detail/CVE-2021-1732 (opens in a new tab)

Description

CVE-2021-1732 is a high-severity privilege escalation vulnerability in Microsoft Win32k. The vulnerability is unspecified in detail but has been exploited in the wild and is known to be used in ransomware campaigns. No specific affected versions or patch information is provided in the available data.

Summary

Microsoft Win32k contains an unspecified vulnerability (CVE-2021-1732) that allows an attacker to escalate privileges on a vulnerable system. The vulnerability is classified under CWE-787 (Out-of-bounds Write). It has been exploited in the wild and is associated with ransomware campaigns. No detailed technical information or patch status is provided in the input data.

Impact

Successful exploitation of this vulnerability allows an attacker to escalate privileges, potentially gaining higher-level access on affected systems. This can facilitate further malicious activities such as ransomware deployment. The vulnerability is actively exploited in the wild, increasing the risk to affected systems.

Mitigation

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Due to the lack of explicit patch information, organizations should monitor official Microsoft advisories for updates and apply any available security updates promptly.

Weaknesses

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

What to do

Description

AnalysisAI-generated, updated 10/24/2026, 09:12:19 UTC

Weaknesses

References

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