CVE-2021-25241Network attack vector

Agent enumeration via unauthenticated web-console SSRF

Published Feb 4, 2021 · Updated Aug 3, 2024

Server-side request forgery in Trend Micro Apex One 2019 and Worry-Free Business Security 10.0 SP1 allows remote attackers to enumerate online agents. The web console, exposed on TCP port 4343 by default, applies improper access control to a crafted server-side request and returns results that distinguish reachable agents. No authentication or user interaction is required, and the disclosed information is limited to the online presence of managed agents.

CVSS severity5.3
Medium
EPSS probability1.87%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Server-side request forgery in Trend Micro Apex One 2019 and Worry-Free Business Security 10.0 SP1 allows remote attackers to enumerate online agents. The web console, exposed on TCP port 4343 by default, applies improper access control to a crafted server-side request and returns results that distinguish reachable agents. No authentication or user interaction is required, and the disclosed information is limited to the online presence of managed agents.

The record

CVE
CVE-2021-25241
Published
Feb 4, 2021
Updated
Aug 3, 2024
Vendor
Trend Micro
Product
Trend Micro Worry-Free Business Security
Classifications
CWE-918, T1046
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

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

CWE-918Server-Side Request Forgery (SSRF)
T1046Network Service Discovery

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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