{"cve":"CVE-2021-20608","nvd":{"published":"2021-12-17T17:15:11.937","modified":"2026-06-17T03:34:06.447","status":"Modified","description":"Improper Handling of Length Parameter Inconsistency vulnerability in Mitsubishi Electric GX Works2 versions 1.606G and prior allows a remote unauthenticated attacker to cause a DoS condition in GX Works2 by getting GX Works2 to read a tampered program file from a Mitsubishi Electric PLC by sending malicious crafted packets to tamper with the program file.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":[],"references":["https://jvn.jp/vu/JVNVU93019896/index.html","https://us-cert.cisa.gov/ics/advisories/icsa-21-350-04","https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-020_en.pdf","https://jvn.jp/vu/JVNVU93019896/index.html","https://us-cert.cisa.gov/ics/advisories/icsa-21-350-04"],"products":["mitsubishielectric:gx_works2"],"source":"nvd","synced_at":"2026-10-19T21:25:41.256909649+00:00"},"epss":{"cve":"CVE-2021-20608","score":0.02884,"percentile":0.86869,"date":"2026-11-01"},"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."]}