{"cve":"CVE-2021-20593","nvd":{"published":"2021-07-13T14:15:08.410","modified":"2026-06-17T03:34:04.980","status":"Modified","description":"Incorrect Implementation of Authentication Algorithm in Mitsubishi Electric Air Conditioning System/Centralized Controllers (G-50A Ver.2.50 to Ver. 3.35, GB-50A Ver.2.50 to Ver. 3.35, AG-150A-A Ver.3.20 and prior, AG-150A-J Ver.3.20 and prior, GB-50ADA-A Ver.3.20 and prior, GB-50ADA-J Ver.3.20 and prior, EB-50GU-A Ver 7.09 and prior, EB-50GU-J Ver 7.09 and prior, AE-200A Ver 7.93 and prior, AE-200E Ver 7.93 and prior, AE-50A Ver 7.93 and prior, AE-50E Ver 7.93 and prior, EW-50A Ver 7.93 and prior, EW-50E Ver 7.93 and prior, TE-200A Ver 7.93 and prior, TE-50A Ver 7.93 and prior, TW-50A Ver 7.93 and prior, CMS-RMD-J Ver.1.30 and prior) and Air Conditioning System/Expansion Controllers (PAC-YG50ECA Ver.2.20 and prior) allows a remote authenticated attacker to impersonate administrators to disclose configuration information of the air conditioning system and tamper information (e.g. operation information and configuration of air conditioning system) by exploiting this vulnerability.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N","score":7.1},"cwes":["CWE-287"],"references":["https://jvn.jp/vu/JVNVU96046575/index.html","https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-004_en.pdf","https://jvn.jp/vu/JVNVU96046575/index.html","https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-004_en.pdf"],"products":["mitsubishi:ae-200a_firmware","mitsubishi:ae-200e_firmware","mitsubishi:ae-50a_firmware","mitsubishi:ae-50e_firmware","mitsubishi:ag-150a-a_firmware","mitsubishi:ag-150a-j_firmware","mitsubishi:cms-rmd-j_firmware","mitsubishi:eb-50gu-a_firmware","mitsubishi:eb-50gu-j_firmware","mitsubishi:ew-50a_firmware","mitsubishi:ew-50e_firmware","mitsubishi:g-50a_firmware","mitsubishi:gb-50a_firmware","mitsubishi:gb-50ada-a_firmware","mitsubishi:gb-50ada-j_firmware","mitsubishi:pac-yg50eca_firmware","mitsubishi:te-200a_firmware","mitsubishi:te-50a_firmware","mitsubishi:tw-50a_firmware"],"source":"nvd","synced_at":"2026-10-19T21:21:13.713336758+00:00"},"epss":{"cve":"CVE-2021-20593","score":0.00853,"percentile":0.58298,"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."]}