What is CVE-2021-25237?

CVE-2021-25237 is a medium-severity vulnerability in Microsoft Windows. CVSS score: 5.3/10. Published 2021-02-04.

How severe is CVE-2021-25237?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Microsoft Windows

CVE-2021-25237

An improper access control vulnerability in Trend Micro Apex One (on-prem) could allow an unauthenticated user to obtain information about the managing port used by agents.

Published 2021-02-04 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.016 (74.5th percentile), scored 2026-10-03.

Low probability of exploitation in the next 30 days, but still tracked. 75th percentile — 74.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: 0.000

Affected products

Microsoft Windows
Trend Micro Apex One — versions 2019
Trendmicro Apex One — versions 2019

References

success.trendmicro.com/solution/000284202 (Patch, Vendor Advisory)
www.zerodayinitiative.com/advisories/ZDI-21-111/ (VDB Entry, Third Party Advisory)

Frequently asked questions

What is CVE-2021-25237?: CVE-2021-25237 is a medium-severity vulnerability in Microsoft Windows. CVSS score: 5.3/10. Published 2021-02-04.
How severe is CVE-2021-25237?: Medium severity. CVSS v3 base score is 5.3 out of 10.