What is CVE-2021-37400?

CVE-2021-37400 is a critical-severity vulnerability in Idec Data File Manager, classified under Insufficiently Protected Credentials. CVSS score: 9.8/10. Published 2021-12-28.

How severe is CVE-2021-37400?

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

Vulnerability in Idec Data File Manager

CVE-2021-37400

An attacker may obtain the user credentials from the communication between the PLC and the software. As a result, the PLC user program may be uploaded, altered, and/or downloaded.

Published 2021-12-28 · 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: 0.013 (70.2th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 70th percentile — 70.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-522 — Insufficiently Protected Credentials

References

us.idec.com/idec-us/en/USD/Programmable-Logic-Controller/Micro-PLC/FC6A-MicroSm… (Vendor Advisory)
us.idec.com/idec-us/en/USD/Software-Downloads-Automation-Organizer (Vendor Advisory)
www.idec.com/home/lp/pdf/2021-12-24-PLC.pdf (Vendor Advisory)
jvn.jp/en/vu/JVNVU92279973/ (Third Party Advisory)

Frequently asked questions

What is CVE-2021-37400?: CVE-2021-37400 is a critical-severity vulnerability in Idec Data File Manager, classified under Insufficiently Protected Credentials. CVSS score: 9.8/10. Published 2021-12-28.
How severe is CVE-2021-37400?: Critical severity. CVSS v3 base score is 9.8 out of 10.