CVE-2021-36741
Actively exploited. CVE-2021-36741 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.
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.
CSIRTS triage
- What
- There is an improper input validation vulnerability that allows a remote attacker to upload files.
- Who is affected
- Deployments of Trend Micro Apex One, Apex One as a Service, and Worry-Free Business Security.
- Urgency
- Remediation is urgent due to the critical severity and confirmed exploitation.
- Action
- Apply the latest patches provided by Trend Micro.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 91% of all EPSS-scored CVEs.
Advisory coverage (1)
- criticalexploitedCVE-2021-36741: Trend Micro Multiple Products Improper Input Validation Vulnerabilitycisa-kev · 2021-11-03
External references
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[](https://www.csirts.com/cve/CVE-2021-36741)