#VU54511 Incorrect Implementation of Authentication Algorithm in Mitsubishi Electric products - CVE-2021-20593

Vulnerability identifier: #VU54511

Vulnerability risk: Medium

CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green

CVE-ID: CVE-2021-20593

CWE-ID: CWE-303

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerable software:
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
PAC-YG50ECA

Software vendor:
Mitsubishi Electric

The vulnerability allows a remote attacker to gain elevated privileges on the target system.

The vulnerability exists due to incorrect implementation of the authentication algorithm. A remote authenticated attacker can impersonate an administrator and tamper with information (e.g., operation information and configuration of the air conditioning system).

Install updates from vendor's website.

• https://ics-cert.us-cert.gov/advisories/icsa-21-182-04