CVE-2021-25243Network attack vector

Unauthenticated patch-level disclosure via web console

Published Feb 4, 2021 · Updated Aug 3, 2024

Improper access control in Trend Micro Apex One, OfficeScan, and Worry-Free Business Security lets remote attackers read patch levels. In Apex One 2019 and SaaS, the web console on TCP port 4343 returns application information without enforcing access control; OfficeScan XG SP1 and Worry-Free Business Security 10.0 SP1 are also affected. No authentication or user interaction is required, and the disclosed data is limited to installed patch-level information.

CVSS severity5.3
Medium
EPSS probability2.15%
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 Trend Micro Apex One, OfficeScan, and Worry-Free Business Security lets remote attackers read patch levels. In Apex One 2019 and SaaS, the web console on TCP port 4343 returns application information without enforcing access control; OfficeScan XG SP1 and Worry-Free Business Security 10.0 SP1 are also affected. No authentication or user interaction is required, and the disclosed data is limited to installed patch-level information.

The record

CVE
CVE-2021-25243
Published
Feb 4, 2021
Updated
Aug 3, 2024
Vendor
Trend Micro
Product
Trend Micro Worry-Free Business Security
Classifications
T1592.002
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, SaaS
Trend Micro · Trend Micro OfficeScanversion=XG SP1

Published CVSS scores

5.0NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:N
5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/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

T1592.002Gather Victim Host Information: Software

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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