What is CVE-2021-28646?

CVE-2021-28646 is a medium-severity vulnerability in Trend Micro Apex One, classified under Incorrect Permission Assignment for Critical Resource. CVSS score: 5.5/10. Published 2021-04-13.

How severe is CVE-2021-28646?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Vulnerability in Trend Micro Apex One

CVE-2021-28646

An insecure file permissions vulnerability in Trend Micro Apex One, Apex One as a Service and OfficeScan XG SP1 could allow a local attacker to take control of a specific log file on affected installations.

Published 2021-04-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.004 (34.3th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 34.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Trend Micro Apex One — versions 2019, SaaS
Trend Micro Officescan — versions XG SP1
Trendmicro Apex One — versions 2019
Trendmicro Officescan — versions xg

Weakness classification (CWE)

CWE-732 — Incorrect Permission Assignment for Critical Resource

References

success.trendmicro.com/solution/000286019 (Vendor Advisory)
success.trendmicro.com/solution/000286157 (Vendor Advisory)

Frequently asked questions

What is CVE-2021-28646?: CVE-2021-28646 is a medium-severity vulnerability in Trend Micro Apex One, classified under Incorrect Permission Assignment for Critical Resource. CVSS score: 5.5/10. Published 2021-04-13.
How severe is CVE-2021-28646?: Medium severity. CVSS v3 base score is 5.5 out of 10.