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CVE-2020-24557: Trend Micro Multiple Products Improper Access Control Vulnerability

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2021-11-03
• EPSS: 2.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-09-01 · updated 2026-06-17

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.

Affected products

• Trend Micro Apex One: 2019
• Trend Micro Worry-Free Business Security: 10.0-sp1

References

• https://success.trendmicro.com/solution/000263632
• https://success.trendmicro.com/solution/000267260
• https://www.zerodayinitiative.com/advisories/ZDI-20-1094/
• https://success.trendmicro.com/solution/000263632
• https://success.trendmicro.com/solution/000267260
• https://www.zerodayinitiative.com/advisories/ZDI-20-1094/
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-24557

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