CVE-2021-20826

lowpriority · track · 30EPSS 0.004 · 34 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.40% (34th) EPSS

CVSS 3.3 · low

Is it mine?

24 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · cisa_csaf_ot · nvd

EPSS · scored 2026-10-27

Unprotected transport of credentials vulnerability in IDEC PLCs (FC6A Series MICROSmart All-in-One CPU module v2.32 and earlier, FC6A Series MICROSmart Plus CPU module v1.91 and earlier, WindLDR v8.19.1 and earlier, WindEDIT Lite v1.3.1 and earlier, and Data File Manager v2.12.1 and earlier) allows an attacker to obtain the PLC Web server user credentials from the communication between the PLC and the software. As a result, the complete access privileges to the PLC Web server may be obtained, and manipulation of the PLC output and/or suspension of the PLC may be conducted.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedData File Managercisa_csaf_ot
WindLDR: v8.20.0 and later
FixedFC6A MICROSmart All-in-One CPU Modulecisa_csaf_ot
WindLDR: v8.20.0 and later
FixedFC6A MICROSmart Plus CPU Modulecisa_csaf_ot
WindLDR: v8.20.0 and later
FixedFC6B MICROSmart All-in-One CPU Modulecisa_csaf_ot
WindLDR: v8.20.0 and later
FixedFC6B MICROSmart Plus CPU Modulecisa_csaf_ot
WindLDR: v8.20.0 and later
FixedFT1A Controller SmartAXIS Pro/Litecisa_csaf_ot
WindLDR: v8.20.0 and later
FixedWindEDITcisa_csaf_ot
WindLDR: v8.20.0 and later
FixedWindEDIT Litecisa_csaf_ot
WindLDR: v8.20.0 and later
FixedWindLDRcisa_csaf_ot
WindLDR: v8.20.0 and later
MitigationData File Managercisa_csaf_ot
Data File Manager: v2.13.0 and later
MitigationFC6A MICROSmart All-in-One CPU Modulecisa_csaf_ot
Data File Manager: v2.13.0 and later
MitigationFC6A MICROSmart Plus CPU Modulecisa_csaf_ot
Data File Manager: v2.13.0 and later
MitigationFC6B MICROSmart All-in-One CPU Modulecisa_csaf_ot
Data File Manager: v2.13.0 and later
MitigationFC6B MICROSmart Plus CPU Modulecisa_csaf_ot
Data File Manager: v2.13.0 and later
MitigationFT1A Controller SmartAXIS Pro/Litecisa_csaf_ot
Data File Manager: v2.13.0 and later
MitigationWindEDITcisa_csaf_ot
Data File Manager: v2.13.0 and later
MitigationWindEDIT Litecisa_csaf_ot
Data File Manager: v2.13.0 and later
MitigationWindLDRcisa_csaf_ot
Data File Manager: v2.13.0 and later

cvss

Technical severity, 0–10. One row per scoring source.

7.6

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–high · 3.3–7.6

v2.03.3lowAV:A/AC:L/Au:N/C:P/I:N/A:Nprimary · NVD / NIST USexploitability 6.5 · impact 2.9

v3.17.6highCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:Lprimary · NVD / NIST USexploitability 2.8 · impact 4.7

v3.07.6highCVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:Lsecondary · CISA US

v3.17highCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-522USprimaryCWE-523US

affected products (24)

Products and version ranges known to be affected.

Data File Manager: v2.12.1 and earlierall versionscisa_csaf_otUS
FC6A MICROSmart All-in-One CPU Module: v2.32 and earlierall versionscisa_csaf_otUS
FC6A MICROSmart Plus CPU Module: v1.91 and earlierall versionscisa_csaf_otUS
FC6B MICROSmart All-in-One CPU Module: v2.31 and earlierall versionscisa_csaf_otUS
FC6B MICROSmart Plus CPU Module: v2.31 and earlierall versionscisa_csaf_otUS
FT1A Controller SmartAXIS Pro/Lite: v2.31 and earlierall versionscisa_csaf_otUS
WindEDIT Lite: v1.3.1 and earlierall versionscisa_csaf_otUS
WindEDIT: Lite v1.3.1 and earlierall versionscisa_csaf_otUS
WindLDR: v8.19.1 and earlierall versionscisa_csaf_otUS
IDEC Data File Manager≤ 2.12.1cisa_csaf_otUS
IDEC FC6A MICROSmart All-in-One CPU Module≤ 2.32cisa_csaf_otUS
IDEC FC6A MICROSmart Plus CPU Module≤ 1.91cisa_csaf_otUS
IDEC FC6B MICROSmart All-in-One CPU Module≤ 2.31cisa_csaf_otUS
IDEC FC6B MICROSmart Plus CPU Module≤ 2.31cisa_csaf_otUS
IDEC FT1A Controller SmartAXIS Pro/Lite≤ 2.31cisa_csaf_otUS
IDEC WindEDIT≤ 1.3.1cisa_csaf_otUS
IDEC WindEDIT Lite≤ 1.3.1cisa_csaf_otUS
IDEC WindLDR≤ 8.19.1cisa_csaf_otUS
IDEC Corporation IDEC PLC≤ FC6A Series MICROSmart All-in-One CPU module v2.32 and earlier, FC6A Series MICROSmart Plus CPU module v1.91 and earlier, WindLDR v8.19.1 and earlier, WindEDIT Lite v1.3.1 and earlier, and Data File Manager v2.12.1 and earlierenisa_euvdEU
idec data file manager≤ 2.12.1nvdUScpe:2.3:a:idec:data_file_manager:*:*:*:*:*:*:*:*

showing 20 of 24

advisories (1)

Vendor and ecosystem advisories describing this.

ICSA-22-006-03IDEC PLCs2022-01-06icsa · cisa_csaf_otUS
Successful exploitation of these vulnerabilities could allow an attacker to upload, alter, and/or download the PLC user program. An attacker could also access the PLC web server and hijack the controllers, resulting in the manipulation and/or suspension of the PLC output.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cisa_csaf_ot nvd NVD CVE.org MITRE

published 2021-12-24modified 2026-06-17

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references (12)

External citations — patches, advisories, analysis.

scry

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