CVE-2020-24557
Trend Micro Multiple Products Improper Access Control Vulnerability
- High 7.8
- Exploited: added to CISA KEV 3 Nov 2021
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.
Key facts
- Published
- 1 Sep 2020
- Last changed
- 21 Oct 2025
- Assigned by
- trendmicro
- KEV added
- 3 Nov 2021
- KEV fix due
- 3 May 2022
- EPSS
- 2.666% likely to be exploited in the next 30 days, higher than 85.973% of CVEs (scores for 15 Nov 2026)
- SSVC (CISA)
- Exploitation: active; Automatable: no; Technical impact: total
Severity scores
Each score is shown as its source gave it. They are not averaged or merged.
- 7.8CVSS 3.1, Highfrom CISA (ADP container)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
What to do
- Apply updates per vendor instructions.CISA KEV required action
Historical context and remediation
This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.
No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.
Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Trend Micro | Trend Micro Apex One |
|
| Trend Micro | Trend Micro Worry-Free Business Security |
|
Timeline
- 1 Sep 2020 Published
- 3 Nov 2021 CVE-2020-24557 added to CISA KEV
- 3 Nov 2021 Added to the CISA KEV catalogue