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CVE-2021-36742: Trend Micro Multiple Products Improper Input Validation Vulnerability

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2021-11-03
• EPSS: 1.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-07-29 · updated 2026-06-17
• Weakness: CWE-20

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.

Affected products

• Trend Micro Apex One: 2019
• Trend Micro OfficeScan: xg-sp1
• Trendmicro Officescan Business Security: 10.0-sp1
• Trend Micro Worry-Free Business Security: 10.0-sp1

References

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

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