CVE-2021-37401

Name: CVE-2021-37401
Creator: NVD / NIST
Published: 2021-12-28T13:15:08.267+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.34%

Last modified Jun 17, 2026

CVE-2021-37401 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. An attacker may obtain the user credentials from file servers, backup repositories, or ZLD files saved in SD cards. As a result, the PLC user program may be uploaded, altered, and/or downloaded.. EPSS estimates a 1.34% chance of exploitation in the next 30 days.

Description

An attacker may obtain the user credentials from file servers, backup repositories, or ZLD files saved in SD cards. As a result, the PLC user program may be uploaded, altered, and/or downloaded.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

1.34%

67.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-522

Affected Software

Vendor	Product	Versions
Idec	Data File Manager	<= 2.12.1
Idec	Windedit	<= 1.3.1
Idec	Windldr	<= 8.19.1
Idec	Microsmart Plus Fc6b Firmware	<= 2.31
Idec	Microsmart Plus Fc6a Firmware	<= 1.91
Idec	Microsmart Fc6b Firmware	<= 2.31
Idec	Microsmart Fc6a Firmware	<= 2.32
Idec	Ft1a Smartaxix Pro Firmware	<= 2.31
Idec	Ft1a Smartaxix Lite Firmware	<= 2.31

References

https://jvn.jp/en/vu/JVNVU92279973/Third Party Advisory
https://us.idec.com/idec-us/en/USD/Programmable-Logic-Controller/Micro-PLC/FC6A-MicroSmart/c/MicroSmart_FC6AVendor Advisory
https://us.idec.com/idec-us/en/USD/Software-Downloads-Automation-OrganizerVendor Advisory
https://www.idec.com/home/lp/pdf/2021-12-24-PLC.pdfVendor Advisory
https://jvn.jp/en/vu/JVNVU92279973/Third Party Advisory
https://us.idec.com/idec-us/en/USD/Programmable-Logic-Controller/Micro-PLC/FC6A-MicroSmart/c/MicroSmart_FC6AVendor Advisory
https://us.idec.com/idec-us/en/USD/Software-Downloads-Automation-OrganizerVendor Advisory
https://www.idec.com/home/lp/pdf/2021-12-24-PLC.pdfVendor Advisory

Timeline

Published: Dec 28, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-37401?

An attacker may obtain the user credentials from file servers, backup repositories, or ZLD files saved in SD cards. As a result, the PLC user program may be uploaded, altered, and/or downloaded.

How severe is CVE-2021-37401?

CVE-2021-37401 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.34% probability of exploitation in the next 30 days.

How do I fix CVE-2021-37401?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-37401?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST