CVE-2021-36742

Name: CVE-2021-36742
Creator: NVD / NIST
Published: 2021-07-29T20:15:07.65+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10Actively ExploitedEPSS 1.48%

Last modified Jun 17, 2026

CVE-2021-36742 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. A 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 local attacker to escalate privileges on affected installations. Please note: an attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.. CISA has confirmed active exploitation in the wild. EPSS estimates a 1.48% chance of exploitation in the next 30 days.

Description

A 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 local attacker to escalate privileges on affected installations. Please note: an attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.

Metrics

CVSS 3.1

7.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

1.48%

70.7th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Nov 17, 2021.

Weakness Enumeration

Affected Software

Vendor	Product	Versions	Update
Trendmicro	Officescan	xg	Sp1
Trendmicro	Officescan Business Security	10.0	Sp1
Trendmicro	Apex One	2019	—
Trendmicro	Worry-Free Business Security	10.0	Sp1

References

https://success.trendmicro.com/jp/solution/000287796Vendor Advisory
https://success.trendmicro.com/jp/solution/000287815Vendor Advisory
https://success.trendmicro.com/solution/000287819Vendor Advisory
https://success.trendmicro.com/solution/000287820Vendor Advisory
https://success.trendmicro.com/jp/solution/000287796Vendor Advisory
https://success.trendmicro.com/jp/solution/000287815Vendor Advisory
https://success.trendmicro.com/solution/000287819Vendor Advisory
https://success.trendmicro.com/solution/000287820Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-36742US Government Resource

Timeline

Published: Jul 29, 2021
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2021-36742?

How severe is CVE-2021-36742?

CVE-2021-36742 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 1.48% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2021-36742?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-36742?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST