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Fencer Vulns
critical 9.8

CVE-2021-37401 json

An attacker may obtain the user credentials from file servers, backup repositories, or ZLD files saved in SD cards.

published 2021-12-28 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-23970

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.4%
EPSS 1.4% chance of exploitation in 30 days, percentile 72%
public exploits
0
none known

Summary

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.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-22-006-03 updated cvss 7.6

IDEC PLCs

  • IDEC Data File Manager <= 2.12.1 IDEC FC6A MICROSmart All-in-One CPU Module <= 2.32 IDEC FC6A MICROSmart Plus CPU Module <= 1.91 IDEC FC6B MICROSmart All-in-One CPU Module <= 2.31 IDEC FC6B MICROSmart Plus CPU Module <= 2.31 IDEC FT1A Controller SmartAXIS Pro/Lite <= 2.31
    +3 more products
    IDEC WindEDIT <= 1.3.1 IDEC WindEDIT Lite <= 1.3.1 IDEC WindLDR <= 8.19.1
    affected: vendor fix, mitigation “FC6A MICROSmart All-in-One CPU Module: v2.40 and later” idec.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Exploit prediction

1.38% chance of exploitation in the next 30 days, higher than 72% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-522 Insufficiently Protected Credentials

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.