CVE-2021-36741An 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…
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It affects Trend Micro Apex One and 6 other products. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Nov 3, 2021; federal agencies had to remediate by Nov 17, 2021. Treat that date as your deadline.
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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.
- CVSS
- 8.8 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-434
- Known exploited
- Added to CISA KEV Nov 3, 2021; federal remediation due Nov 17, 2021Apply updates per vendor instructions.
- EPSS (exploitation in the next 30 days)
- 4.95% (percentile 92)
- Assigned by
- trendmicro
- NVD analysis
- Analyzed
- Record last updated
- Oct 21, 2025
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Trend Micro Trend Micro Apex One trend_micro:apex_one (from the name) | 2019, SaaS | CNA record |
Trend Micro Trend Micro OfficeScan trend_micro:officescan (from the name) | XG SP1 | CNA record |
Trend Micro Trend Micro Worry-Free Business Security trend_micro:worry_free_business_security (from the name) | 10.0 SP1 | CNA record |
trendmicro officescan trendmicro:officescan | xg | NVD |
trendmicro officescan_business_security trendmicro:officescan_business_security | 10.0 | NVD |
trendmicro apex_one trendmicro:apex_one | 2019 | NVD |
trendmicro worry-free_business_security trendmicro:worry-free_business_security | 10.0 | NVD |
References
- https://success.trendmicro.com/solution/000287819x-refsource-misc, broken-link, vendor-advisory
- https://success.trendmicro.com/solution/000287820x-refsource-misc, broken-link, vendor-advisory
- https://success.trendmicro.com/jp/solution/000287796x-refsource-misc, broken-link, vendor-advisory
- https://success.trendmicro.com/jp/solution/000287815x-refsource-misc, broken-link, vendor-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-36741us-government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.