CVE-2021-34486VulnerabilityPublished 03/28/2022Updated 10/24/2026

CVE-2021-34486: Microsoft Windows Event Tracing Privilege Escalation Vulnerability

Affects Microsoft WindowsSource CISA KEV

Severity

High

No CVSS score published yet

Exploitation: Actively exploited – in CISA KEV since 03/28/2022
KEV deadline: 04/18/2022
EPSS: 9.3% chance of exploitation in 30 days – higher than 95% of CVEs

What to do

CISA required action

Apply updates per vendor instructions.

nvd.nist.gov/vuln/detail/CVE-2021-34486 (opens in a new tab)

Description

CVE-2021-34486 is a high-severity privilege escalation vulnerability in Microsoft Windows Event Tracing. The vulnerability is unspecified in detail but has been exploited in the wild. It allows an attacker to elevate privileges on affected Windows systems. No specific affected versions or patch information is provided in the available data.

Summary

Microsoft Windows Event Tracing contains an unspecified vulnerability (CVE-2021-34486) that can be exploited to escalate privileges. The vulnerability has been observed in active exploitation scenarios. Details on the exact nature of the flaw or affected Windows versions are not provided. The vulnerability is associated with CWE-416 (Use After Free).

Impact

Successful exploitation of this vulnerability allows an attacker to escalate privileges on a Windows system, potentially gaining higher-level access than initially permitted. This can lead to unauthorized actions and compromise of system integrity. The vulnerability has been exploited in the wild, indicating active threat use.

Mitigation

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official patch or workaround information is provided in the available data. Organizations should monitor Microsoft advisories for updates and apply any released fixes promptly.

Weaknesses

CWE-416Use After Free (opens in a new tab)

What to do

Description

AnalysisAI-generated, updated 10/24/2026, 11:12:16 UTC

Weaknesses

References

Related threats