CVE-2021-36742VulnerabilityPublished 11/03/2021Updated 10/24/2026

CVE-2021-36742: Trend Micro Multiple Products Improper Input Validation Vulnerability

Affects Trend Micro Apex One, Apex One as a Service, and Worry-Free Business SecuritySource 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: 1.5% chance of exploitation in 30 days – higher than 73% of CVEs

What to do

CISA required action

Apply updates per vendor instructions.

Description

CVE-2021-36742 is an improper input validation vulnerability in Trend Micro Apex One, Apex One as a Service, and Worry-Free Business Security products that allows privilege escalation. This vulnerability has been exploited in the wild. No specific affected versions or patch information are provided.

Summary

Trend Micro Apex One, Apex One as a Service, and Worry-Free Business Security contain an improper input validation vulnerability (CWE-20) that enables attackers to escalate privileges. The vulnerability has been confirmed to be exploited in the wild. No detailed version or patch information is available from the provided data.

Impact

Successful exploitation of this vulnerability allows an attacker to escalate privileges within the affected Trend Micro products, potentially leading to unauthorized access or control over the system. The vulnerability is actively exploited in the wild, indicating a real and present risk to affected environments.

Mitigation

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no patch or official fix information is provided, users should monitor Trend Micro advisories for updates and apply patches as soon as they become available.

Weaknesses

CWE-20Improper Input Validation (opens in a new tab)

What to do

Description

AnalysisAI-generated, updated 10/24/2026, 08:43:18 UTC

Weaknesses

References

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