CVE-2021-36741
Trend Micro Multiple Products Improper Input Validation Vulnerability - [Actively Exploited]
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.
INFO
Published Date :
July 29, 2021, 8:15 p.m.
Last Modified :
Oct. 31, 2025, 5:14 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CISA KEV (Known Exploited Vulnerabilities)
For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild.
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.
Apply updates per vendor instructions.
https://success.trendmicro.com/dcx/s/solution/000287819?language=en_US, https://success.trendmicro.com/dcx/s/solution/000287820?language=en_US; https://nvd.nist.gov/vuln/detail/CVE-2021-36741
Affected Products
The following products are affected by CVE-2021-36741
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 2.0 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | HIGH | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
- Upgrade Apex One to the latest patch.
- Upgrade OfficeScan to the latest patch.
- Upgrade Worry-Free Business Security to the latest patch.
Public PoC/Exploit Available at Github
CVE-2021-36741 has a 2 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-36741.
| URL | Resource |
|---|---|
| https://success.trendmicro.com/jp/solution/000287796 | Broken Link Vendor Advisory |
| https://success.trendmicro.com/jp/solution/000287815 | Broken Link Vendor Advisory |
| https://success.trendmicro.com/solution/000287819 | Broken Link Vendor Advisory |
| https://success.trendmicro.com/solution/000287820 | Broken Link Vendor Advisory |
| https://success.trendmicro.com/jp/solution/000287796 | Broken Link Vendor Advisory |
| https://success.trendmicro.com/jp/solution/000287815 | Broken Link Vendor Advisory |
| https://success.trendmicro.com/solution/000287819 | Broken Link Vendor Advisory |
| https://success.trendmicro.com/solution/000287820 | Broken Link Vendor Advisory |
| https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-36741 | US Government Resource |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-36741 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-36741
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Ostorlab KEV: One-command to detect most remotely known exploitable vulnerabilities. Sourced from CISA KEV, Google's Tsunami, Ostorlab's Asteroid and Bug Bounty programs.
cisa-kev vulnerability 0day cisa exploits
List of real-world threats against endpoint protection software
antivirus security incidents exploits vulnerability endpoint-protection
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-36741 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-36741 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Modified Analysis by [email protected]
Oct. 31, 2025
Action Type Old Value New Value Added Reference Type CISA-ADP: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-36741 Types: US Government Resource -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Oct. 22, 2025
Action Type Old Value New Value Added Reference https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-36741 -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Oct. 21, 2025
Action Type Old Value New Value Removed Reference https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-36741 -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Oct. 21, 2025
Action Type Old Value New Value Added Reference https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-36741 -
Modified Analysis by [email protected]
Mar. 13, 2025
Action Type Old Value New Value Changed CPE Configuration AND OR cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* OR *cpe:2.3:a:trendmicro:apex_one:2019:*:*:*:*:*:*:* *cpe:2.3:a:trendmicro:worry-free_business_security:10.0:sp1:*:*:*:*:*:* AND OR cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* OR *cpe:2.3:a:trendmicro:apex_one:2019:*:*:*:*:*:*:* *cpe:2.3:a:trendmicro:worry-free_business_security:10.0:sp1:*:*:*:*:*:* Changed CPE Configuration AND OR cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* OR *cpe:2.3:a:trendmicro:apex_one:2019:*:*:*:*:*:*:* *cpe:2.3:a:trendmicro:worry-free_business_security:10.0:sp1:*:*:*:*:*:* AND OR cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* OR *cpe:2.3:a:trendmicro:apex_one:2019:*:*:*:*:*:*:* *cpe:2.3:a:trendmicro:worry-free_business_security:10.0:sp1:*:*:*:*:*:* -
CVE Modified by [email protected]
Feb. 26, 2025
Action Type Old Value New Value Changed 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. 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. -
Modified Analysis by [email protected]
Feb. 12, 2025
Action Type Old Value New Value Changed 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. 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. -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Feb. 07, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-434 -
CVE Modified by [email protected]
Nov. 21, 2024
Action Type Old Value New Value Changed 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. 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. -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://success.trendmicro.com/jp/solution/000287796 Added Reference https://success.trendmicro.com/jp/solution/000287815 Added Reference https://success.trendmicro.com/solution/000287819 Added Reference https://success.trendmicro.com/solution/000287820 -
Modified Analysis by [email protected]
Aug. 14, 2024
Action Type Old Value New Value Changed 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. 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. Removed CWE NIST CWE-20 Added CWE NIST CWE-434 -
CVE Modified by [email protected]
Aug. 04, 2024
Action Type Old Value New Value Changed 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. 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. -
Modified Analysis by [email protected]
Jul. 26, 2024
Action Type Old Value New Value Changed 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. 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. Changed Reference Type https://success.trendmicro.com/jp/solution/000287796 Vendor Advisory https://success.trendmicro.com/jp/solution/000287796 Broken Link, Vendor Advisory Changed Reference Type https://success.trendmicro.com/jp/solution/000287815 Vendor Advisory https://success.trendmicro.com/jp/solution/000287815 Broken Link, Vendor Advisory Changed Reference Type https://success.trendmicro.com/solution/000287819 Vendor Advisory https://success.trendmicro.com/solution/000287819 Broken Link, Vendor Advisory Changed Reference Type https://success.trendmicro.com/solution/000287820 Vendor Advisory https://success.trendmicro.com/solution/000287820 Broken Link, Vendor Advisory -
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
CVE Modified by [email protected]
Nov. 07, 2023
Action Type Old Value New Value Changed 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. 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. -
Modified Analysis by [email protected]
Mar. 01, 2023
Action Type Old Value New Value -
CVE Modified by [email protected]
Jan. 25, 2023
Action Type Old Value New Value Changed 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. 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. -
Modified Analysis by [email protected]
Jul. 02, 2022
Action Type Old Value New Value -
CVE Modified by [email protected]
May. 16, 2022
Action Type Old Value New Value Changed 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. 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. -
CVE Modified by [email protected]
May. 12, 2022
Action Type Old Value New Value Changed 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. 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. -
CVE Modified by [email protected]
May. 12, 2022
Action Type Old Value New Value Changed 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. 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. -
Modified Analysis by [email protected]
Sep. 21, 2021
Action Type Old Value New Value -
CVE Modified by [email protected]
Aug. 19, 2021
Action Type Old Value New Value Changed 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. 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. -
CVE Modified by [email protected]
Aug. 19, 2021
Action Type Old Value New Value Changed 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. 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. -
Initial Analysis by [email protected]
Aug. 06, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:L/Au:S/C:P/I:P/A:P) Added CVSS V3.1 NIST AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Changed Reference Type https://success.trendmicro.com/jp/solution/000287796 No Types Assigned https://success.trendmicro.com/jp/solution/000287796 Vendor Advisory Changed Reference Type https://success.trendmicro.com/jp/solution/000287815 No Types Assigned https://success.trendmicro.com/jp/solution/000287815 Vendor Advisory Changed Reference Type https://success.trendmicro.com/solution/000287819 No Types Assigned https://success.trendmicro.com/solution/000287819 Vendor Advisory Changed Reference Type https://success.trendmicro.com/solution/000287820 No Types Assigned https://success.trendmicro.com/solution/000287820 Vendor Advisory Added CWE NIST CWE-20 Added CPE Configuration OR *cpe:2.3:a:trendmicro:officescan:xg:sp1:*:*:*:*:*:* *cpe:2.3:a:trendmicro:officescan_business_security:10.0:sp1:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:a:trendmicro:apex_one:2019:*:*:*:*:*:*:* *cpe:2.3:a:trendmicro:worry-free_business_security:10.0:sp1:*:*:*:*:*:* OR cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Jul. 30, 2021
Action Type Old Value New Value Changed 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. 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.
Vulnerability Scoring Details
Base CVSS Score: 8.8
Base CVSS Score: 6.5
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.66 }} -0.13%
score
0.70359
percentile