CVE-2023-4625

Denial-of-Service(DoS) Vulnerability in Web server function on MELSEC Series CPU module

MEDIUM
5.3
CVSS Score
Published: November 6, 2023 at 04:57 AM UTC
Updated: June 17, 2026 at 06:38 AM UTC
206 products affected across 1 vendorFX5UC 32MR /ds Ts FirmwareFX5UC 32MT /dss FirmwareFX5UJ 24MT /es Firmware

Using MELSEC iQ-F Series FX5U-32MT/ES by Mitsubishi Electric Corporation?

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Severity
MEDIUM5.3
Exploit prediction
EPSS 0.9%
SSVC
No known exploit

Description

Improper Restriction of Excessive Authentication Attempts vulnerability in Mitsubishi Electric Corporation MELSEC iQ-F/iQ-R Series CPU modules Web server function allows a remote unauthenticated attacker to prevent legitimate users from logging into the Web server function for a certain period after the attacker has attempted to log in illegally by continuously attempting unauthorized login to the Web server function. The impact of this vulnerability will persist while the attacker continues to attempt unauthorized login.

Affected

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

All versions
mitsubishielectric-fx5s-30mr-es (same device)
All versions
mitsubishielectric-fx5s-30mt-es (same device)
All versions
mitsubishielectric-fx5s-30mt-ess (same device)
All versions
mitsubishielectric-fx5s-40mr-es (same device)
All versions
mitsubishielectric-fx5s-40mt-es (same device)
All versions
mitsubishielectric-fx5s-40mt-ess (same device)
All versions
mitsubishielectric-fx5s-60mr-es (same device)
All versions
mitsubishielectric-fx5s-60mt-es (same device)
All versions
mitsubishielectric-fx5s-60mt-ess (same device)
All versions
mitsubishielectric-fx5s-80mr-es (same device)

Remediation

No guide yet

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

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.3MEDIUMMitsubishi
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-307

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