CVE-2021-25239Network attack vector

Hotfix metadata disclosure via unauthenticated web console

Published Feb 4, 2021 · Updated Aug 3, 2024

Improper access control in Apex One, OfficeScan, and Worry-Free Business Security allows remote attackers to obtain x86 agent hotfix data. The TCP 4343 web console returns this agent-maintenance metadata without enforcing authentication. Network access to the on-premises console is sufficient, and the reported impact is limited to disclosure of hotfix information.

CVSS severity5.3
Medium
EPSS probability2.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in Apex One, OfficeScan, and Worry-Free Business Security allows remote attackers to obtain x86 agent hotfix data. The TCP 4343 web console returns this agent-maintenance metadata without enforcing authentication. Network access to the on-premises console is sufficient, and the reported impact is limited to disclosure of hotfix information.

The record

CVE
CVE-2021-25239
Published
Feb 4, 2021
Updated
Aug 3, 2024
Vendor
Trend Micro
Product
Trend Micro Worry-Free Business Security
Classifications
Unavailable
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 4, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Trend Micro · Trend Micro Worry-Free Business Securityversion=10.0 SP1
Trend Micro · Trend Micro Apex Oneversion=2019
Trend Micro · Trend Micro OfficeScanversion=XG SP1

Published CVSS scores

5.3Trend Micro Zero Day InitiativeCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
5.3NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
5.0NVDAV:N/AC:L/Au:N/C:P/I:N/A:N

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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