CVE-2021-36741 Trend Micro Multiple Products Improper Input Validation

Exploited in the wild High 8.8 Published 29 Jul 2021 Updated 21 Oct 2025

Remote attackers with console access can upload arbitrary files to Trend Micro security products, potentially leading to code execution.

Exploited in the wild: Since 3 Nov 2021
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2021-36741?

CVE-2021-36741 is a high-severity vulnerability in Trendmicro Apex One, published on 29 Jul 2021. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

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.

Weakness: CWE-434

Which versions are affected by CVE-2021-36741?

It affects 4 products.

Products include Trendmicro Apex One, Trendmicro Officescan, Trendmicro Officescan Business Security, Trendmicro Worry-Free Business Security.

How do I fix CVE-2021-36741?

No fix has been published for CVE-2021-36741 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 17 Nov 2021.

Is CVE-2021-36741 being exploited?

Yes. Attackers have exploited CVE-2021-36741 in the wild since at least 3 Nov 2021.

All Trendmicro Apex One vulnerabilities

Sources

Also known as GHSA-7w3v-7x22-4g8v.