CVE-2021-36742

HIGH7.8

CISA KEV

Published 2021-07-29 · Updated 2026-06-17 · Source security@trendmicro.com

Summary

CVE-2021-36742 is a high-severity (CVSS 7.8) vulnerability in Trend Micro Apex One, Apex One as a Service, and Worry-Free Business Security. CISA added it to the Known Exploited Vulnerabilities catalog on November 3, 2021, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by November 17, 2021. CISA does not currently list it as used in ransomware campaigns. Trend Micro has 12 vulnerabilities in the KEV catalog, 0 of them linked to ransomware.

All 12 known-exploited Trend Micro vulnerabilities →

Description

A improper input validation vulnerability in Trend Micro Apex One, Apex One as a Service, OfficeScan XG and Worry-Free Business Security 10.0 SP1 allows a local attacker to escalate privileges on affected installations. Please note: an attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.

CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE-20CWE-20

CISA Known-Exploited Vulnerability

Product: Trend Micro — Apex One, Apex One as a Service, and Worry-Free Business Security

Name: Trend Micro Multiple Products Improper Input Validation Vulnerability

Date added: 2021-11-03 · Due: 2021-11-17

Required action: Apply updates per vendor instructions.

References

View on NVD

More exploited Trend Micro vulnerabilities

Most recently added to CISA KEV

CVE-2026-34926
Apex One — Trend Micro Apex One (On-Premise) Directory Traversal Vulnerability
added 2026-05-21
CVE-2025-54948
Apex One — Trend Micro Apex One OS Command Injection Vulnerability
added 2025-08-18
CVE-2023-41179
Apex One and Worry-Free Business Security — Trend Micro Apex One and Worry-Free Business Security Remote Code Execution Vulnerability
added 2023-09-21
CVE-2022-40139
Apex One and Apex One as a Service — Trend Micro Apex One and Apex One as a Service Improper Validation Vulnerability
added 2022-09-15
CVE-2022-26871
Apex Central — Trend Micro Apex Central Arbitrary File Upload Vulnerability
added 2022-03-31
CVE-2019-18187
OfficeScan — Trend Micro OfficeScan Directory Traversal Vulnerability
added 2021-11-03

View all →

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