CVE-2021-20593
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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.85%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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 3.1
- 7.1 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
- EPSS
- 0.85% probability · 58th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-287
- Affected
- mitsubishi/g-50a firmware · mitsubishi/gb-50a firmware · mitsubishi/ag-150a-a firmware · mitsubishi/ag-150a-j firmware · mitsubishi/gb-50ada-a firmware · mitsubishi/gb-50ada-j firmware · mitsubishi/eb-50gu-a firmware · mitsubishi/eb-50gu-j firmware · mitsubishi/ae-200a firmware · mitsubishi/ae-200e firmware · mitsubishi/ae-50a firmware · mitsubishi/ae-50e firmware · mitsubishi/ew-50a firmware · mitsubishi/ew-50e firmware · mitsubishi/te-200a firmware · mitsubishi/te-50a firmware · mitsubishi/tw-50a firmware · mitsubishi/cms-rmd-j firmware · mitsubishi/pac-yg50eca firmware
- Source
- Mitsubishielectric.Psirt@yd.MitsubishiElectric.co.jp
EPSS 0.9% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://jvn.jp/vu/JVNVU96046575/index.htmlThird Party Advisory
- https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-004_en.pdfVendor Advisory
- https://jvn.jp/vu/JVNVU96046575/index.htmlThird Party Advisory
- https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-004_en.pdfVendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.