high
7.1
CWE
287
Advisory Published
Updated

CVE-2021-20593

First published: Tue Jul 13 2021(Updated: )

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.

Credit: Mitsubishielectric.Psirt@yd.MitsubishiElectric.co.jp

Affected SoftwareAffected VersionHow to fix
Mitsubishi G-50a Firmware>=2.50<=3.35
Mitsubishi G-50a
Mitsubishi Gb-50a Firmware>=2.50<=3.35
Mitsubishi Gb-50a
Mitsubishi Ag-150a-a Firmware<=3.20
Mitsubishi Ag-150a-a
Mitsubishi Ag-150a-j Firmware<=3.20
Mitsubishi Ag-150a-j
Mitsubishi Gb-50ada-a Firmware<=3.20
Mitsubishi Gb-50ada-a
Mitsubishi Gb-50ada-j Firmware<=3.20
Mitsubishi Gb-50ada-j
Mitsubishi Eb-50gu-a Firmware<=7.09
Mitsubishi Eb-50gu-a
Mitsubishi Eb-50gu-j Firmware<=7.09
Mitsubishi Eb-50gu-j
Mitsubishi Ae-200a Firmware<=7.93
Mitsubishi Ae-200a
Mitsubishi Ae-200e Firmware<=7.93
Mitsubishi Ae-200e
Mitsubishi Ae-50a Firmware<=7.93
Mitsubishi Ae-50a
Mitsubishi Ae-50e Firmware<=7.93
Mitsubishi Ae-50e
Mitsubishi Ew-50a Firmware<=7.93
Mitsubishi Ew-50a
Mitsubishi Ew-50e Firmware<=7.93
Mitsubishi Ew-50e
Mitsubishi Te-200a Firmware<=7.93
Mitsubishi Te-200a
Mitsubishi Te-50a Firmware<=7.93
Mitsubishi Te-50a
Mitsubishi Tw-50a Firmware<=7.93
Mitsubishi Tw-50a
Mitsubishi Cms-rmd-j Firmware<=1.30
Mitsubishi Cms-rmd-j
Mitsubishi Pac-yg50eca Firmware<=2.20
Mitsubishi Pac-yg50eca

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Reference Links

Frequently Asked Questions

  • What is CVE-2021-20593?

    CVE-2021-20593 is a vulnerability in the Mitsubishi Electric Air Conditioning System/Centralized Controllers that results from an incorrect implementation of the authentication algorithm.

  • What is the severity of CVE-2021-20593?

    CVE-2021-20593 has a severity value of 7.1 (high).

  • Which versions of Mitsubishi Electric Air Conditioning System/Centralized Controllers are affected by CVE-2021-20593?

    Mitsubishi Electric Air Conditioning System/Centralized Controllers versions 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 are affected.

  • How can I fix CVE-2021-20593?

    To fix CVE-2021-20593, it is recommended to update Mitsubishi Electric Air Conditioning System/Centralized Controllers to a version that is not affected by the vulnerability.

  • Where can I find more information about CVE-2021-20593?

    You can find more information about CVE-2021-20593 in the vulnerability report published by the Japan Vulnerability Notes (JVN) and the official Mitsubishi Electric PSIRT website.

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