CVE intelligence and bounded remediation

CVE-2023-2846 — Mitsubishielectric Fx3U-16Mr/Es Firmware security vulnerability

Critical CVSS 9.1

Authentication Bypass by Capture-replay vulnerability in Mitsubishi Electric Corporation MELSEC iQ-F Series main modules allows a remote unauthenticated attacker to cancel the password/keyword setting and login to the affected products by sending specially crafted packets.

Severity
Critical
CVSS
9.1 (3.1)
Published
2023-06-30
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-294

Affected products

  • mitsubishielectric / fx3u-16mr/es_firmware
  • mitsubishielectric / fx3u-16mt/es_firmware
  • mitsubishielectric / fx3u-16mt/ess_firmware
  • mitsubishielectric / fx3u-32mr/es_firmware
  • mitsubishielectric / fx3u-32mt/es_firmware
  • mitsubishielectric / fx3u-32mt/ess_firmware

Showing 6 representative product identities from 150 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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