CVE-2021-20598

MEDIUM
5.3
CVSS Score
Published: August 6, 2021 at 04:53 PM UTC
Updated: June 17, 2026 at 03:34 AM UTC
24 products affected across 1 vendorR120SFCPU FirmwareR08SFCPU FirmwareR32SFCPU Firmware

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

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Severity
MEDIUM5.3
Exploit prediction
EPSS 2%

Description

Overly Restrictive Account Lockout Mechanism vulnerability in Mitsubishi Electric MELSEC iQ-R series CPU modules (R08/16/32/120SFCPU all versions, R08/16/32/120PSFCPU all versions) allows a remote unauthenticated attacker to lockout a legitimate user by continuously trying login with incorrect password.

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
NONE
Integrity
NONE
Availability
LOW
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-287

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