CVE-2020-24557

HIGH7.8

CISA KEV

Published 2020-09-01 · Updated 2026-06-17 · Source security@trendmicro.com

Summary

CVE-2020-24557 is a high-severity (CVSS 7.8) vulnerability in Trend Micro Apex One, OfficeScan, 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 May 3, 2022. 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 vulnerability in Trend Micro Apex One and Worry-Free Business Security 10.0 SP1 on Microsoft Windows may allow an attacker to manipulate a particular product folder to disable the security temporarily, abuse a specific Windows function and attain privilege escalation. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. Please note that version 1909 (OS Build 18363.719) of Microsoft Windows 10 mitigates hard links, but previous versions are affected.

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

CISA Known-Exploited Vulnerability

Product: Trend Micro — Apex One, OfficeScan, and Worry-Free Business Security

Name: Trend Micro Multiple Products Improper Access Control Vulnerability

Date added: 2021-11-03 · Due: 2022-05-03

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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