CVE-2021-20826

HIGH
7.6
CVSS Score
Published: December 24, 2021 at 06:30 AM UTC
Updated: June 17, 2026 at 03:34 AM UTC
8 products affected across 1 vendorWindLDRData File ManagerMicrosmart FC6A Firmware

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Severity
HIGH7.6
Exploit prediction
EPSS 0.4%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v ≤ 2.32
idec-microsmart-fc6a (same device)
v ≤ 1.91
idec-microsmart-plus-fc6a (same device)
v ≤ 1.3.1
v ≤ 8.19.1
v ≤ 2.32
All versions
All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (2)

CVSS

Attack Vector
ADJACENT_NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
LOW
Availability
LOW
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-522

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