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Findings

CVE-2020-24557

Trend Micro Multiple Products Improper Access Control Vulnerability

Published Sep 1, 2020 · corrected/updated Jun 16, 2026 · Trend Micro Apex One, OfficeScan and Worry-Free Business Security Agents · evidence confidence very high

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.

Grounded briefings

Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.

Executive

CVE-2020-24557 is a high public vulnerability record for Trend Micro Apex One, OfficeScan and Worry-Free Business Security Agents. CISA lists it as known exploited. Published remediation guidance: Apply updates per vendor instructions. This summary is a catalog interpretation of the ingested metadata and cites the original advisories below.

System administrator

Identify whether Trend Micro Apex One, OfficeScan and Worry-Free Business Security Agents is in your estate, then compare installed versions with the affected ranges. Affected packages or ranges on record: trendmicro/apex one; trendmicro/apex one (2019); trendmicro/worry-free business security (10.0); Trend Micro Apex One, OfficeScan and Worry-Free Business Security Agents. Published remediation guidance: Apply updates per vendor instructions. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.

Security analyst

Signals on file: CVSS 7.8, EPSS 2.7%. CISA lists it as known exploited. Sources contributing to this record: cisa_kev, cve_org, epss, nvd. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.

Exploitation and remediation

  • Exploitation evidence

    Confirmed in CISA KEV since Apr 21, 2021. Listed in CISA KEV and VulnCheck KEV.

  • Patch and remediation

    Apply updates per vendor instructions. CISA due date May 3, 2022.

  • Safe detection guidance

    Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 1, 2020 · Catalog

    Detected

    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 vulnerabil

  2. Nov 3, 2021 · CISA KEV

    Known exploited

    Apply updates per vendor instructions.

  3. May 3, 2022 · CISA KEV

    Remediation due

    Apply updates per vendor instructions.

  4. Jun 16, 2026 · Catalog

    Updated

    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 vulnerabil

Affected

  • cpe trendmicro/apex oneversion unspecified
  • cpe trendmicro/apex one2019
  • cpe trendmicro/worry-free business security10.0
  • vendor Trend Micro Apex One, OfficeScan and Worry-Free Business Security Agentsversion unspecified
  • vendor Trend Micro Apex One, OfficeScan, and Worry-Free Business Securityversion unspecified

Sources

  • CISA KEVConfirmed exploitationCVE-2020-24557

    Trend Micro Apex One, OfficeScan, and Worry-Free Business Security on Microsoft Windows contain an improper access control vulnerability that may allow an attacker to manipulate a particular product folder to disable the security temporarily, abuse a specific Windows function, and attain privilege escalation.

    cisa.gov
  • CVE.orgVulnerability recordCVE-2020-24557

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2020-24557

    30-day exploitation probability 2.7%

    first.org
  • NIST NVDVulnerability recordCVE-2020-24557

    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 attack

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-2020-24557

    Trend Micro Apex One, OfficeScan, and Worry-Free Business Security on Microsoft Windows contain an improper access control vulnerability that may allow an attacker to manipulate a particular product folder to disable the security temporarily, abuse a specific Windows function, an

    vulncheck.com

References