High severity · published Jul 13, 2021
CVE-2021-20593
Incorrect Implementation of Authentication Algorithm in Mitsubishi Electric Air Conditioning System/Centralized Controllers (G-50A Ver.2.50 to Ver
7.1
CVSS
0.9%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.9% · higher than 58% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AC
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 ·
Ver.2.50 to Ver.3.35; Ver.3.20 and prior; Ver 7.09 and prior; Ver 7.93 and prior; Ver.1.30 and prior; Ver.2.20 and prior · source: vendor
AF
Ae-200a Firmware · Mitsubishi
through 7.93 · source: NVD
AF
Ae-200e Firmware · Mitsubishi
through 7.93 · source: NVD
AF
Ae-50a Firmware · Mitsubishi
through 7.93 · source: NVD
AF
Ae-50e Firmware · Mitsubishi
through 7.93 · source: NVD
AF
Ag-150a-a Firmware · Mitsubishi
through 3.20 · source: NVD
AF
Ag-150a-j Firmware · Mitsubishi
through 3.20 · source: NVD
CF
Cms-rmd-j Firmware · Mitsubishi
through 1.30 · source: NVD
EF
Eb-50gu-a Firmware · Mitsubishi
through 7.09 · source: NVD
EF
Eb-50gu-j Firmware · Mitsubishi
through 7.09 · source: NVD
EF
Ew-50a Firmware · Mitsubishi
through 7.93 · source: NVD
EF
Ew-50e Firmware · Mitsubishi
through 7.93 · source: NVD
Affected product
AC
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