CVE-2021-20594

HIGH
7.5
CVSS Score
Published: August 6, 2021 at 12:00 AM UTC
Updated: June 17, 2026 at 03:34 AM UTC
24 products affected across 1 vendorR120SFCPU FirmwareR08SFCPU FirmwareR32SFCPU Firmware

Using Mitsubishi Electric MELSEC iQ-R series Safety CPU modules R08/16/32/120SFCPU; Mitsubishi Electric MELSEC iQ-R series SIL2 Process CPU modules R08/16/32/120PSFCPU by N/A?

Get instant alerts when new vulnerabilities affect Mitsubishi Electric MELSEC iQ-R series Safety CPU modules R08/16/32/120SFCPU; Mitsubishi Electric MELSEC iQ-R series SIL2 Process CPU modules R08/16/32/120PSFCPU - before attackers find them.

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Severity
HIGH7.5
Exploit prediction
EPSS 2%

Description

Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Mitsubishi Electric MELSEC iQ-R series Safety CPU modules R08/16/32/120SFCPU firmware versions "26" and prior and Mitsubishi Electric MELSEC iQ-R series SIL2 Process CPU modules R08/16/32/120PSFCPU firmware versions "11" and prior allows a remote unauthenticated attacker to acquire legitimate user names registered in the module via brute-force attack on user names.

Affected

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

All versions
mitsubishielectric-r08psfcpu (same device)
All versions
mitsubishielectric-r08sfcpu (same device)
All versions
mitsubishielectric-r120psfcpu (same device)
All versions
mitsubishielectric-r120sfcpu (same device)
All versions
mitsubishielectric-r16psfcpu (same device)
All versions
mitsubishielectric-r16sfcpu (same device)
All versions
mitsubishielectric-r32psfcpu (same device)
All versions
mitsubishielectric-r32sfcpu (same device)

Remediation

No guide yet

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

CVSS

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

Quick Info

StatusMODIFIED
CWE
CWE-200

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