{"id":"CVE-2021-20608","aliases":["EUVD-2021-8026","GHSA-jvfx-87xv-97xc"],"status":"published","title":"Improper Handling of Length Parameter Inconsistency vulnerability in Mitsubishi Electric GX...","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.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.02884,"percentile":0.87043,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2021-12-17T16:10:27Z","modified":"2026-06-17T03:34:06Z","products":[{"vendor":"mitsubishi electric corporation","product":"gx works2"},{"vendor":"mitsubishielectric","product":"gx_works2"}],"references":[{"url":"https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-020_en.pdf","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://jvn.jp/vu/JVNVU93019896/index.html","tags":["x_refsource_MISC","x_transferred","Third Party Advisory"]},{"url":"https://us-cert.cisa.gov/ics/advisories/icsa-21-350-04","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","US Government Resource"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-20608"},{"url":"https://github.com/advisories/GHSA-jvfx-87xv-97xc"}],"sources":{"cve":[{"id":"CVE-2021-20608","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.","status":"published","published":"2021-12-17T16:10:27Z","modified":"2024-08-03T17:45:44.831Z","updated_at":"2026-11-02T14:32:55.564736Z"}],"euvd":[{"id":"EUVD-2021-8026","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.","status":"published","published":"2021-12-17T16:10:27Z","modified":"2024-08-03T17:45:44Z","updated_at":"2026-11-03T03:25:08.888273Z"}],"ghsa":[{"id":"GHSA-jvfx-87xv-97xc","title":"Improper Handling of Length Parameter Inconsistency vulnerability in Mitsubishi Electric GX...","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.","status":"published","published":"2021-12-18T00:00:51Z","modified":"2023-02-01T05:07:09Z","updated_at":"2026-11-02T14:50:29.480738Z"}],"nvd":[{"id":"CVE-2021-20608","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.","status":"published","published":"2021-12-17T17:15:11.937Z","modified":"2026-06-17T03:34:06.447Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:07:02.566991Z"}]}}