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CVE-2021-20593

HIGH
7.1
CVSS Score
Published: July 13, 2021 at 01:30 PM UTC
Updated: June 17, 2026 at 03:34 AM UTC
38 products affected across 1 vendorTe 200A FirmwareEb 50GU a FirmwareTe 50A Firmware· also runs on 19 platforms

Using Air Conditioning System/Centralized Controllers G-50A; GB-50A; AG-150A-A; AG-150A-J; GB-50ADA-A; GB-50ADA-J; EB-50GU-A; EB-50GU-J; AE-200A; AE-200E; AE-50A; AE-50E; EW-50A; EW-50E; TE-200A; TE-50A; TW-50A; CMS-RMD-J; Air Conditioning System/Expansion Controllers PAC-YG50ECA by N/A?

Get instant alerts when new vulnerabilities affect Air Conditioning System/Centralized Controllers G-50A; GB-50A; AG-150A-A; AG-150A-J; GB-50ADA-A; GB-50ADA-J; EB-50GU-A; EB-50GU-J; AE-200A; AE-200E; AE-50A; AE-50E; EW-50A; EW-50E; TE-200A; TE-50A; TW-50A; CMS-RMD-J; Air Conditioning System/Expansion Controllers PAC-YG50ECA - before attackers find them.

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Severity
HIGH7.1
Exploit prediction
EPSS 0.9%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Ae 200A Firmware· Mitsubishi Electric
95%
v ≤ 7.93
mitsubishi-ae-200a (environment)
Ae 200E Firmware· Mitsubishi Electric
95%
v ≤ 7.93
mitsubishi-ae-200e (environment)
Ae 50A Firmware· Mitsubishi Electric
95%
v ≤ 7.93
mitsubishi-ae-50a (environment)
Ae 50E Firmware· Mitsubishi Electric
95%
v ≤ 7.93
mitsubishi-ae-50e (environment)
Ag 150A a Firmware· Mitsubishi Electric
95%
v ≤ 3.20
mitsubishi-ag-150a-a (environment)
Ag 150A J Firmware· Mitsubishi Electric
95%
v ≤ 3.20
mitsubishi-ag-150a-j (environment)
CMS Rmd J Firmware· Mitsubishi Electric
95%
v ≤ 1.30
mitsubishi-cms-rmd-j (environment)
Eb 50GU a Firmware· Mitsubishi Electric
95%
v ≤ 7.09
mitsubishi-eb-50gu-a (environment)
Eb 50GU J Firmware· Mitsubishi Electric
95%
v ≤ 7.09
mitsubishi-eb-50gu-j (environment)
Ew 50A Firmware· Mitsubishi Electric
95%
v ≤ 7.93
mitsubishi-ew-50a (environment)

Runs on — not affected

The affected product only carries this flaw when running on these platforms. The platforms themselves are not vulnerable.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

x_refsource_MISCThird Party Advisory
Source: [email protected]
https://jvn.jp/vu/JVNVU96046575/index.html
x_refsource_MISCVendor Advisory
Source: [email protected]
https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-004_en.pdf

CVSS

7.1HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-287

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