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CVE-2020-24557

HIGH
7.8
CVSS Score
Published: September 1, 2020 at 06:55 PM UTC
Updated: June 17, 2026 at 03:05 AM UTC
2 products affected across 1 vendorApex OneWorry-Free Business Security· also runs on 1 platform

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Severity
HIGH7.8
Exploitation
CISA KEV
Exploit prediction
EPSS 3%
SSVC
Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score2.7%

EPSS (Exploit Prediction Scoring System) estimates a 2.7% chance this CVE is exploited in the wild within the next 30 days — higher than 86% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

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.

Required Action
Apply updates per vendor instructions.
Ransomware Use
Unknown
Added to KEV
Nov 3, 2021
Remediation Due
May 3, 2022
1641 days overdue
Notes
https://nvd.nist.gov/vuln/detail/CVE-2020-24557

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Apex One· Trend Micro
95%
2009 (on premise), SaaS2019
microsoft-windows (environment)
Worry-Free Business Security· Trend Micro
95%
10.0 SP110.0 sp1
microsoft-windows (environment)

Runs on — not affected

The affected product only carries this flaw when running on these platforms. The platforms themselves are not vulnerable.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (4)

x_refsource_MISCVendor Advisory
Source: [email protected]
https://success.trendmicro.com/solution/000263632
x_refsource_MISCVendor Advisory
Source: [email protected]
https://success.trendmicro.com/solution/000267260
x_refsource_MISCThird Party AdvisoryVDB Entry
Source: [email protected]
https://www.zerodayinitiative.com/advisories/ZDI-20-1094/
US Government Resource
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-24557

SSVC — Action Prioritization

SSVCActiveNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.8HIGHCISA-ADP
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
NVD-CWE-Other

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