CVE-2021-44024

Service interruption via symbolic-link file overwrite

Published Jan 8, 2022 · Updated Aug 4, 2024

Link following in Trend Micro Apex One 2019 and SaaS and Worry-Free Business Security 10.0 SP1 and Services allows local users to overwrite files. The Real-time Scan Service follows an attacker-created symbolic link while writing a file, redirecting its SYSTEM-context write to an arbitrary target. Exploitation requires low-privileged code execution on a Windows endpoint and can damage a target file sufficiently to interrupt the system.

CVSS severity6.1
Medium
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Link following in Trend Micro Apex One 2019 and SaaS and Worry-Free Business Security 10.0 SP1 and Services allows local users to overwrite files. The Real-time Scan Service follows an attacker-created symbolic link while writing a file, redirecting its SYSTEM-context write to an arbitrary target. Exploitation requires low-privileged code execution on a Windows endpoint and can damage a target file sufficiently to interrupt the system.

The record

CVE
CVE-2021-44024
Published
Jan 8, 2022
Updated
Aug 4, 2024
Vendor
Trend Micro
Product
Trend Micro Worry-Free Business Security
Classifications
CWE-59, T1485
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 8, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.0 SP1, Services (SaaS)

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Trend Micro · Trend Micro Worry-Free Business Securityversion=10.0 SP1, Services (SaaS)
Trend Micro · Trend Micro Apex Oneversion=2019, SaaS

Published CVSS scores

6.1Trend MicroCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-59Improper Link Resolution Before File Access ('Link Following')
T1485Data Destruction

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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