How severe is CVE-2021-40177?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Zohocorp Manageengine Log360

CVE-2021-40177

Zoho ManageEngine Log360 before Build 5225 allows remote code execution via BCP file overwrite.

Published 2021-08-29 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.046 (91.3th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 91st percentile — 91.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.046 · newest: 0.046 · change: 0.000

Affected products

Zohocorp Manageengine Log360 — versions 5.2

References

www.manageengine.com/log-management/readme.html (Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2021-40177?: CVE-2021-40177 is a critical-severity vulnerability in Zohocorp Manageengine Log360. CVSS score: 9.8/10. Published 2021-08-29.
How severe is CVE-2021-40177?: Critical severity. CVSS v3 base score is 9.8 out of 10.