# CVE-2021-36741: Trend Micro Multiple Products Improper Input Validation Vulnerability

Source: https://junglewise.ai/threats/cve-2021-36741-trend-micro-multiple-products-improper-input-validation  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2021-11-03. Updated: 2026-05-10  
License: CC BY 4.0 with a link back

CVE-2021-36741 · Severity: critical · CVSS 8.8 · Exploited in the wild · Published 2021-11-03

An improper input validation vulnerability in multiple Trend Micro endpoint security products allows a remote attacker with management console access to upload arbitrary files. This vulnerability affects Apex One, Apex One as a Service, OfficeScan XG, and Worry-Free Business Security 10.0 SP1.

## Quick answers

**Is CVE-2021-36741 exploited in the wild?** Yes. CVE-2021-36741 is known to be exploited in the wild, first recorded on 3 November 2021. Treat it as urgent.

**How severe is CVE-2021-36741?** Critical severity, with a CVSS score of 8.8, published 3 November 2021.

**Which products and versions are affected?** Trend Micro Apex One; Trend Micro Apex One as a Service; Trend Micro OfficeScan XG; Trend Micro Worry-Free Business Security 10.0 SP1.

**Is there a fix for CVE-2021-36741?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2021-36741 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2021-36741?** Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Trend Micro Apex One
- Trend Micro Apex One as a Service
- Trend Micro OfficeScan XG
- Trend Micro Worry-Free Business Security 10.0 SP1

## Timeline

- 2021-11-03: disclosed
- 2021-11-03: kev added: Added to CISA Known Exploited Vulnerabilities Catalog
- 2021-11-03: exploited: Reported as exploited in the wild.