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VULNERABILITIES

CVE-2021-20826 Details

Description

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:7.6 HIGHVector:CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://jvn.jp/en/vu/JVNVU92279973/index.html CVEThird Party Advisory
https://www.idec.com/home/lp/pdf/2021-12-24-PLC.pdf CVEVendor Advisory
https://jvn.jp/en/vu/JVNVU92279973/index.html [email protected]Third Party Advisory
https://www.idec.com/home/lp/pdf/2021-12-24-PLC.pdf [email protected]Vendor Advisory

Weakness Enumeration

CWE-IDCWE NameSource
CWE-522Insufficiently Protected Credentials[email protected]

Affected Products

ProductVersions

Change History

4 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2021-20826
NVD Published Date:
Dec 24, 2021
NVD Last Modified:
Jun 17, 2026
Source:
[email protected]
CVE-2021-20826 Details - Not Deferred