How severe is CVE-2021-37400?

CVE-2021-37400 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-37400 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-37400?

CVE-2021-37400 primarily affects Idec Data File Manager. In total, 9 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-37400?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-37400 published?

CVE-2021-37400 was published on 2021-12-28 and last updated on 2026-06-17.

CVE-2021-37400

CVE-2021-37400 is a critical-severity vulnerability in Idec Data File Manager with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-522.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 1% (68th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-522
Affected product: Idec Data File Manager
Published: 2021-12-28
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2021-37400?: CVE-2021-37400 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-37400 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-37400?: CVE-2021-37400 primarily affects Idec Data File Manager. In total, 9 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-37400?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-37400 published?: CVE-2021-37400 was published on 2021-12-28 and last updated on 2026-06-17.

References

Affected products (9)

cpe:2.3:a:idec:data_file_manager:*:*:*:*:*:*:*:*
cpe:2.3:a:idec:windedit:*:*:*:*:*:*:*:*
cpe:2.3:a:idec:windldr:*:*:*:*:*:*:*:*
cpe:2.3:o:idec:microsmart_plus_fc6b_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:idec:microsmart_plus_fc6a_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:idec:microsmart_fc6b_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:idec:microsmart_fc6a_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:idec:ft1a_smartaxix_pro_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:idec:ft1a_smartaxix_lite_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Idec Data File Manager

CVE-2021-37401 — Critical (CVSS 9.8): An attacker may obtain the user credentials from file servers, backup repositories, or ZLD files saved in SD cards. As…
CVE-2021-20826 — High (CVSS 7.6): Unprotected transport of credentials vulnerability in IDEC PLCs (FC6A Series MICROSmart All-in-One CPU module v2.32 and…
CVE-2021-20827 — High (CVSS 7.5): Plaintext storage of a password vulnerability in IDEC PLCs (FC6A Series MICROSmart All-in-One CPU module v2.32 and…

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