CISA KEV · Known exploitedHigh

CVE-2021-36741

Trend Micro Apex One, Apex One as a Service, and Worry-Free Business Security

An improper input validation vulnerability in Trend Micro Apex One, Apex One as a Service, OfficeScan XG, and Worry-Free Business Security 10.0 SP1 allows a remote attached to upload arbitrary files on affected installations. Please note: an attacker must first obtain the ability to logon to the product�s management console in order to exploit this vulnerability.

CVSS: 8.8
EPSS: 4.95%
CISA KEV: Listed
Published: 2021.07.30

PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV

Exploit probability4.95%

Technical severityCVSS 8.8

Vulnerability overview

Affected product and versions

Product: Trend Micro Apex One, Apex One as a Service, and Worry-Free Business Security
Affected versions: 2019, SaaS, XG SP1, 10.0 SP1, xg, 10.0
Fixed versions: No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

CISA required action

Apply updates per vendor instructions.

Due date: 2021.11.17

1
Identify
Confirm that Trend Micro Apex One, Apex One as a Service, and Worry-Free Business Security and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE: CWE-22, CWE-434
KEV added: 2021.11.03
Ransomware use: 미확인