CVE-2021-20595

moderate-risk
Published 2021-07-13

Improper Restriction of XML External Entity Reference vulnerability in Mitsubishi Electric Air Conditioning System/Centralized Controllers (G-50A Ver.3.35 and prior, GB-50A Ver.3.35 and prior, GB-24A Ver.9.11 and prior, 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), Air Conditioning System/Expansion Controllers (PAC-YG50ECA Ver.2.20 and prior) and Air Conditioning System/BM adapter(BAC-HD150 Ver.2.21 and prior) allows a remote unauthenticated attacker to disclose some of data in the air conditioning system or cause a DoS condition by sending specially crafted packets.

Do I need to act?

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0.15% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
8
CVSS 8.2/10 High
NETWORK / LOW complexity

Affected Products (19)

G-50A Firmware
Gb-50A Firmware
Ag-150A-A Firmware
Ag-150A-J Firmware
Gb-50Ada-A Firmware
Gb-50Ada-J Firmware
Eb-50Gu-A Firmware
Eb-50Gu-J Firmware
Ae-200A Firmware
Ae-200E Firmware
Ae-50A Firmware
Ae-50E Firmware
Ew-50A Firmware
Ew-50E Firmware
Te-200A Firmware
Te-50A Firmware
Tw-50A Firmware
Cms-Rmd-J Firmware
Pac-Yg50Eca Firmware

Affected Vendors

48
/ 100
moderate-risk
Severity 28/34 · Critical
Exploitability 1/34 · Minimal
Exposure 19/34 · Moderate