{"cve":"CVE-2021-20607","nvd":{"published":"2021-12-17T17:15:11.890","modified":"2026-06-17T03:34:06.340","status":"Modified","description":"Integer Underflow vulnerability in Mitsubishi Electric GX Works2 versions 1.606G and prior, Mitsubishi Electric MELSOFT Navigator versions 2.84N and prior and Mitsubishi Electric EZSocket versions 5.4 and prior allows an attacker to cause a DoS condition in the software by getting a user to open malicious project file specially crafted by an attacker.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-191"],"references":["https://jvn.jp/vu/JVNVU93817405/index.html","https://us-cert.cisa.gov/ics/advisories/icsa-21-350-05","https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-021_en.pdf","https://jvn.jp/vu/JVNVU93817405/index.html","https://us-cert.cisa.gov/ics/advisories/icsa-21-350-05"],"products":["mitsubishielectric:ezsocket","mitsubishielectric:gx_works2","mitsubishielectric:melsoft_navigator"],"source":"nvd","synced_at":"2026-10-19T21:25:41.256909649+00:00"},"epss":{"cve":"CVE-2021-20607","score":0.00992,"percentile":0.62572,"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."]}