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Unrated severityNVD Advisory· Published Oct 13, 2023· Updated Feb 27, 2025

Information Disclosure, Information Tampering and Authentication Bypass Vulnerability in MELSEC-F Series main module

CVE-2023-4562

Description

Remote unauthenticated attacker can read or write sequence programs/data on Mitsubishi MELSEC-F series via improper authentication.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Remote unauthenticated attacker can read or write sequence programs/data on Mitsubishi MELSEC-F series via improper authentication.

Vulnerability

An improper authentication vulnerability (CWE-287) exists in Mitsubishi Electric Corporation MELSEC-F Series main modules when used with the Ethernet communication special adapter FX3U-ENET-ADP or Ethernet interface block FX3U-ENET(-L). A remote unauthenticated attacker can send specially crafted messages to the affected product, bypassing the keyword authentication mechanism. The following series and all versions are affected: FX3U, FX3UC, FX3G, FX3GC, FX3GE, FX3GA, FX3S, FX3SA as detailed in the vendor advisory [1][2].

Exploitation

An attacker with network access to the affected MELSEC-F series controller can send illegitimate messages without any prior authentication. No user interaction or special privileges are required. The attack complexity is low and the vulnerability is remotely exploitable over the network [2].

Impact

Successful exploitation allows an attacker to read sequence programs (information disclosure) or write malicious sequence programs or improper data (tampering) without authentication [1][2]. The extent of the impact depends on the number of keyword digits configured: with 8-digit keyword authentication, information leakage and data manipulation are possible [1].

Mitigation

Mitsubishi Electric has not released a firmware fix as of the publication date (2023-10-13). Users are advised to apply network segmentation, restrict access to the affected devices, and follow the recommendations in the vendor advisory [1][2]. The vulnerability is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog as of ICSA-23-285-13 [2].

References
  1. JVNVU#90509290: 三菱電機製MELSEC-Fシリーズ基本ユニットにおける不適切な認証の脆弱性
  2. Mitsubishi Electric MELSEC-F Series | CISA

AI Insight generated on May 25, 2026. Synthesized from this CVE's description and the cited reference URLs; citations are validated against the source bundle.

Affected products

154
  • Mitsubishielectric/MELSEC-Q Seriesllm-fuzzy
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-14MR/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-14MR/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-14MR/ES-Av5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-14MT/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-14MT/DSSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-14MT/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-14MT/ES-Av5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-14MT/ESSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-24MR/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-24MR/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-24MR/ES-Av5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-24MT/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-24MT/DSSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-24MT/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-24MT/ES-Av5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-24MT/ESSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-40MR/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-40MR/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-40MR/ES-Av5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-40MT/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-40MT/DSSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-40MT/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-40MT/ES-Av5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-40MT/ESSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-60MR/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-60MR/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-60MR/ES-Av5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-60MT/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-60MT/DSSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-60MT/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-60MT/ES-Av5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-60MT/ESSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3GA-24MR-CMv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3GA-24MT-CMv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3GA-40MR-CMv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3GA-40MT-CMv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3GA-60MR-CMv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3GA-60MT-CMv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3GC-32MT/Dv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3GC-32MT/DSSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3GE-24MR/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3GE-24MR/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3GE-24MT/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3GE-24MT/DSSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3GE-24MT/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3GE-24MT/ESSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3GE-40MR/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3GE-40MR/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3GE-40MT/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3GE-40MT/DSSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3GE-40MT/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3GE-40MT/ESSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-10MR/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-10MR/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-10MT/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-10MT/DSSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-10MT/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-10MT/ESSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-14MR/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-14MR/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-14MT/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-14MT/DSSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-14MT/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-14MT/ESSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-20MR/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-20MR/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-20MT/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-20MT/DSSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-20MT/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-20MT/ESSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-30MR/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-30MR/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-30MR/ES-2ADv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-30MT/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-30MT/DSSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-30MT/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-30MT/ES-2ADv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-30MT/ESSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-30MT/ESS-2ADv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3SA-10MR-CMv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3SA-10MT-CMv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3SA-14MR-CMv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3SA-14MT-CMv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3SA-20MR-CMv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3SA-20MT-CMv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3SA-30MR-CMv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3SA-30MT-CMv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-128MR/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-128MR/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-128MR/ES-Av5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-128MT/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-128MT/DSSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-128MT/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-128MT/ES-Av5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-128MT/ESSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-16MR/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-16MR/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-16MR/ES-Av5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-16MT/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-16MT/DSSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-16MT/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-16MT/ES-Av5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-16MT/ESSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-32MR/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-32MR/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-32MR/ES-Av5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-32MR/UA1v5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-32MS/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-32MT/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-32MT/DSSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-32MT/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-32MT/ES-Av5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-32MT/ESSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-48MR/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-48MR/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-48MR/ES-Av5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-48MT/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-48MT/DSSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-48MT/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-48MT/ES-Av5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-48MT/ESSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-64MR/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-64MR/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-64MR/ES-Av5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-64MR/UA1v5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-64MS/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-64MT/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-64MT/DSSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-64MT/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-64MT/ES-Av5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-64MT/ESSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-80MR/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-80MR/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-80MR/ES-Av5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-80MT/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-80MT/DSSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-80MT/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-80MT/ES-Av5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-80MT/ESSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3UC-16MR/DS-Tv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3UC-16MR/D-Tv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3UC-16MT/Dv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3UC-16MT/D-P4v5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3UC-16MT/DSSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3UC-16MT/DSS-P4v5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3UC-32MT/Dv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3UC-32MT/DSSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3UC-32MT-LTv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3UC-32MT-LT-2v5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3UC-64MT/Dv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3UC-64MT/DSSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3UC-96MT/Dv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3UC-96MT/DSSv5
    Range: all versions

Patches

0

No patches discovered yet.

Vulnerability mechanics

No source-code context for this CVE — mechanics is only generated when we can read the actual fix diff. Without that, the four sections (root cause, attack vector, affected code, fix) would be speculation rather than analysis.

References

3

News mentions

0

No linked articles in our index yet.