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CVE-2021-20593

HIGHCVSS 7.1/10EPSS 0.85%

Last modified

CVE-2021-20593 is a high-severity vulnerability rated 7.1/10 on the CVSS scale. 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. EPSS estimates a 0.85% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
7.1/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N

EPSS Probability
0.85%

53.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
MitsubishiG-50a Firmware>= 2.50, <= 3.35
MitsubishiGb-50a Firmware>= 2.50, <= 3.35
MitsubishiAg-150a-A Firmware<= 3.20
MitsubishiAg-150a-J Firmware<= 3.20
MitsubishiGb-50ada-A Firmware<= 3.20
MitsubishiGb-50ada-J Firmware<= 3.20
MitsubishiEb-50gu-A Firmware<= 7.09
MitsubishiEb-50gu-J Firmware<= 7.09
MitsubishiAe-200a Firmware<= 7.93
MitsubishiAe-200e Firmware<= 7.93
MitsubishiAe-50a Firmware<= 7.93
MitsubishiAe-50e Firmware<= 7.93
MitsubishiEw-50a Firmware<= 7.93
MitsubishiEw-50e Firmware<= 7.93
MitsubishiTe-200a Firmware<= 7.93
MitsubishiTe-50a Firmware<= 7.93
MitsubishiTw-50a Firmware<= 7.93
MitsubishiCms-Rmd-J Firmware<= 1.30
MitsubishiPac-Yg50eca Firmware<= 2.20

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-20593?
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.
How severe is CVE-2021-20593?
CVE-2021-20593 has a CVSS score of 7.1/10 (HIGH severity). The EPSS model estimates a 0.85% probability of exploitation in the next 30 days.
How do I fix CVE-2021-20593?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-20593?

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Source: NVD / NIST