{"cve":"CVE-2022-40267","nvd":{"published":"2023-01-20T08:15:11.373","modified":"2026-06-17T05:01:12.083","status":"Modified","description":"Predictable Seed in Pseudo-Random Number Generator (PRNG) vulnerability in Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-xMy/z (x=32,64,80, y=T,R, z=ES,DS,ESS,DSS) with serial number 17X**** or later, and versions 1.280 and prior, Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-xMy/z (x=32,64,80, y=T,R, z=ES,DS,ESS,DSS) with serial number 179**** and prior, and versions 1.074 and prior, Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-xMy/z (x=32,64,96, y=T, z=D,DSS)) with serial number 17X**** or later, and versions 1.280 and prior, Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-xMy/z (x=32,64,96, y=T, z=D,DSS)) with serial number 179**** and prior, and versions 1.074 and prior, Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-32MT/DS-TS versions 1.280 and prior, Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-32MT/DSS-TS versions 1.280 and prior, Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-xMy/z (x=24,40,60, y=T,R, z=ES,ESS) versions 1.042 and prior, Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-xMy/ES-A (x=24,40,60, y=T,R) versions 1.043 and prior, Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-xMy/z (x=30,40,60,80, y=T,R, z=ES,ESS) versions 1.003 and prior, Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-32MR/DS-TS versions 1.280 and prior, Mitsubishi Electric Corporation MELSEC iQ-R Series R00/01/02CPU versions 33 and prior, Mitsubishi Electric Corporation MELSEC iQ-R Series R04/08/16/32/120(EN)CPU versions 66 and prior allows a remote unauthenticated attacker to access the Web server function by guessing the random numbers used for authentication from several used random numbers.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","score":9.1},"cwes":["CWE-335","CWE-337"],"references":["https://jvn.jp/vu/JVNVU99673580/index.html","https://www.cisa.gov/uscert/ics/advisories/icsa-23-017-02","https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2022-019_en.pdf","https://jvn.jp/vu/JVNVU99673580/index.html","https://www.cisa.gov/uscert/ics/advisories/icsa-23-017-02"],"products":["mitsubishielectric:fx5s-30mr\\/es_firmware","mitsubishielectric:fx5s-30mt\\/es_firmware","mitsubishielectric:fx5s-30mt\\/ess_firmware","mitsubishielectric:fx5s-40mr\\/es_firmware","mitsubishielectric:fx5s-40mt\\/es_firmware","mitsubishielectric:fx5s-40mt\\/ess_firmware","mitsubishielectric:fx5s-60mr\\/es_firmware","mitsubishielectric:fx5s-60mt\\/es_firmware","mitsubishielectric:fx5s-60mt\\/ess_firmware","mitsubishielectric:fx5s-80mr\\/es_firmware","mitsubishielectric:fx5s-80mt\\/es_firmware","mitsubishielectric:fx5s-80mt\\/ess_firmware","mitsubishielectric:fx5u-32mt\\/dss_firmware","mitsubishielectric:fx5u-64mt\\/dss_firmware","mitsubishielectric:fx5u-80mt\\/dss_firmware","mitsubishielectric:fx5u-80mt\\/ess_firmware","mitsubishielectric:fx5uc-32mr\\/ds-ts_firmware","mitsubishielectric:fx5uc-32mt\\/d_firmware","mitsubishielectric:fx5uc-32mt\\/ds-ts_firmware","mitsubishielectric:fx5uc-32mt\\/dss-ts_firmware","mitsubishielectric:fx5uc-32mt\\/dss_firmware","mitsubishielectric:fx5uc-64mt\\/d_firmware","mitsubishielectric:fx5uc-64mt\\/dss_firmware","mitsubishielectric:fx5uc-96mt\\/d_firmware","mitsubishielectric:fx5uc-96mt\\/dss_firmware","mitsubishielectric:fx5uj-24mr\\/es-a_firmware","mitsubishielectric:fx5uj-24mr\\/es_firmware","mitsubishielectric:fx5uj-24mt\\/es-a_firmware","mitsubishielectric:fx5uj-24mt\\/es_firmware","mitsubishielectric:fx5uj-24mt\\/ess_firmware","mitsubishielectric:fx5uj-40mr\\/es-a_firmware","mitsubishielectric:fx5uj-40mr\\/es_firmware","mitsubishielectric:fx5uj-40mt\\/es-a_firmware","mitsubishielectric:fx5uj-40mt\\/es_firmware","mitsubishielectric:fx5uj-40mt\\/ess_firmware","mitsubishielectric:fx5uj-60mr\\/es-a_firmware","mitsubishielectric:fx5uj-60mr\\/es_firmware","mitsubishielectric:fx5uj-60mt\\/es-a_firmware","mitsubishielectric:fx5uj-60mt\\/es_firmware","mitsubishielectric:fx5uj-60mt\\/ess_firmware","mitsubishielectric:r00cpu_firmware","mitsubishielectric:r01cpu_firmware","mitsubishielectric:r02cpu_firmware","mitsubishielectric:r04cpu_firmware","mitsubishielectric:r04encpu_firmware","mitsubishielectric:r08cpu_firmware","mitsubishielectric:r08encpu_firmware","mitsubishielectric:r120cpu_firmware","mitsubishielectric:r120encpu_firmware","mitsubishielectric:r16cpu_firmware"],"source":"nvd","synced_at":"2026-10-19T21:37:34.931465858+00:00"},"epss":{"cve":"CVE-2022-40267","score":0.01237,"percentile":0.69099,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}