Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
CVE-2020-24557
Trend Micro Apex One, OfficeScan, and Worry-Free Business Security
AV AC PR UI S C I A CVSS EPSS %ile KEV
L L L N U H H H 7.8 .0267 85.5 YES
AFFECTED
Product Versions Fixed
Trend Micro Apex One 2009 (on premise), SaaS – —
Trend Micro Worry-Free Business Security 10.0 SP1 – —
TIMELINE
Aug 20 Reserved by trendmicro
Sep 1 Published (CNA: trendmicro)
Nov 3 Added to CISA KEV, remediation due 2022-05-03
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.
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
| August 20, 2020 | Reserved | Reserved by trendmicro |
| September 1, 2020 | Published | Published (CNA: trendmicro) |
| November 3, 2021 | KEV ADDED | Added to CISA KEV, remediation due 2022-05-03 |
Affected
Affected products and packages — 2 rows
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
| Trend Micro | Trend Micro Apex One | — | 2009 (on premise), SaaS | — |
| Trend Micro | Trend Micro Worry-Free Business Security | — | 10.0 SP1 | — |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2020-24557 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Monday, October 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.