CVE intelligence and bounded remediation

CVE-2023-4699 — Mitsubishielectric Fx3U-32Mt/Es Firmware security vulnerability

Critical CVSS 10

Missing Authentication for Critical Function vulnerability in Mitsubishi Electric Corporation MELSEC-F Series CPU modules, MELSEC iQ-F Series, MELSEC iQ-R series CPU modules, MELSEC iQ-R series, MELSEC iQ-L series, MELSEC Q series, MELSEC-L series, Mitsubishi Electric CNC M800V/M80V series, Mitsubishi Electric CNC M800/M80/E80 series and Mitsubishi Electric CNC M700V/M70V/E70 series allows a remote unauthenticated attacker to execute arbitrary commands by sending specific packets to the affected products. This could lead to disclose or tamper with information by reading or writing control programs, or cause a denial-of-service (DoS) condition on the products by resetting the memory contents of the products to factory settings or resetting the products remotely.

Severity
Critical
CVSS
10 (3.1)
Published
2023-11-06
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-306, CWE-345

Affected products

  • mitsubishielectric / fx3u-32mt/es_firmware
  • mitsubishielectric / fx3u-48mt/es_firmware
  • mitsubishielectric / fx3u-64mt/es_firmware
  • mitsubishielectric / fx3u-80mt/es_firmware
  • mitsubishielectric / fx3u-128mt/e_firmware
  • mitsubishielectric / fx3u-16mt/es_firmware

Showing 6 representative product identities from 216 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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