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

> CVE-2020-24557: Trend Micro Multiple Products Improper Access Control Vulnerability. CVSS 7.8 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2020-24557
Last updated: 2025-10-21T23:35:37Z

- Published: 2020-09-01 18:55 UTC · Updated: 2025-10-21 23:35 UTC · Assigner: trendmicro
- CVSS: 7.8 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS: 2.7%, 86th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2021-11-03, federal due date 2022-05-03, ransomware use: Unknown

## 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.

## CISA required action

Apply updates per vendor instructions.

## Affected vendors and products

- Trend Micro: Trend Micro Apex One
- Trend Micro: Trend Micro Worry-Free Business Security

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2020-24557)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2020-24557)
- [https://success.trendmicro.com/solution/000263632](https://success.trendmicro.com/solution/000263632)
- [https://success.trendmicro.com/solution/000267260](https://success.trendmicro.com/solution/000267260)
- [https://www.zerodayinitiative.com/advisories/ZDI-20-1094/](https://www.zerodayinitiative.com/advisories/ZDI-20-1094/)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2020-24557 · Markdown: https://rewindex.com/cve/CVE-2020-24557.md · JSON: https://rewindex.com/api/v1/cves/CVE-2020-24557 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:11:24.745Z