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Vulnerabilities

Vulnerability · CVE-2021-36741

Trend Micro Multiple Products Improper Input Validation Vulnerability

Published Jul 29, 2021 · catalog updated Jun 16, 2026 · Trend Micro Apex One, Apex One as a Service, and Worry-Free Business Security

Patch now

CVE-2021-36741 is in the CISA known-exploited catalog, due Nov 17, 2021. Confirm Trend Micro Apex One, Apex One as a Service, and Worry-Free Business Security against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Severity
High8.8
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
4.95%
Remediation
Remediation guidance
Affected products
cpe trendmicro/apex one · cpe trendmicro/officescan · cpe trendmicro/officescan business security · cpe trendmicro/worry-free business security · vendor 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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe trendmicro/apex one2019
  • cpe trendmicro/officescanxg
  • cpe trendmicro/officescan business security10.0
  • cpe trendmicro/worry-free business security10.0
  • vendor Trend Micro Apex One, Apex One as a Service, and Worry-Free Business Securityversion unspecified

How to fix CVE-2021-36741

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2021-36741 is in the CISA known-exploited catalog, due Nov 17, 2021. Confirm Trend Micro Apex One, Apex One as a Service, and Worry-Free Business Security against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Compare what you have installed with trendmicro/apex one 2019; trendmicro/officescan business security 10.0; trendmicro/worry-free business security 10.0. Apply updates per vendor instructions.

What should an analyst verify?

CWE-22: Path Traversal; CWE-434: Unrestricted Upload of File with Dangerous Type. EPSS 4.95%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jul 29, 2021 · Catalog

    Detected

    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.

  2. Nov 3, 2021 · CISA KEV

    Known exploited

    Apply updates per vendor instructions.

  3. Nov 17, 2021 · CISA KEV

    Remediation due

    Apply updates per vendor instructions.

  4. Jun 16, 2026 · Catalog

    Updated

    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.

Sources

  • CISA KEVConfirmed exploitationCVE-2021-36741

    Trend Micro Apex One, Apex One as a Service, and Worry-Free Business Security contain an improper input validation vulnerability that allows a remote attacker to upload files.

    cisa.gov
  • CVE.orgVulnerability recordCVE-2021-36741

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2021-36741

    30-day exploitation probability 5.0%

    first.org
  • NIST NVDVulnerability recordCVE-2021-36741

    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

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-2021-36741

    Trend Micro Apex One, Apex One as a Service, and Worry-Free Business Security contain an improper input validation vulnerability that allows a remote attacker to upload files.

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.