CVE intelligence and bounded remediation

CVE-2023-4625 — Mitsubishielectric Fx5U-32Mt/Es Firmware security vulnerability

Medium CVSS 5.3

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.

Severity
Medium
CVSS
5.3 (3.1)
Published
2023-11-06
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-307

Affected products

  • mitsubishielectric / fx5u-32mt/es_firmware
  • mitsubishielectric / fx5u-64mt/es_firmware
  • mitsubishielectric / fx5u-80mt/es_firmware
  • mitsubishielectric / fx5u-32mr/es_firmware
  • mitsubishielectric / fx5u-64mr/es_firmware
  • mitsubishielectric / fx5u-80mr/es_firmware

Showing 6 representative product identities from 63 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

Authentication bypass and missing authentication

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Check exposure

  • Map every affected endpoint and protocol path, including alternate ports, legacy routes, recovery flows, service accounts, and machine-to-machine access.
  • Confirm which deployments enable the affected authentication mode and whether the interface is reachable from untrusted networks.
  • Review session, token, credential, and proxy trust configuration without attempting account takeover.

Remediate safely

  • Apply the supported fix and centralize fail-closed authentication before protected request handling.
  • Remove default or embedded credentials, rotate affected secrets and sessions, and bind authentication decisions to the intended audience and channel.
  • Add negative tests for alternate routes, malformed or absent credentials, recovery flows, and proxy-derived identity.

Authoritative sources

Complete CVE record and remediation plan

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