Buffer overflow in Mitsubishi Electric products - CVE-2021-20589

Vulnerability identifier: #VU53140

CSH Severity: Medium

CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2021-20589

CWE-ID: CWE-119

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary error in the MODBUS/TCP server communication function. A remote attacker can trigger memory corruption and cause a denial of service condition on the target system.

GOT2000 GT27 model
GT SoftGOT2000 Version1
GOT SIMPLE GS21 model
GOT2000 GT25 model
GOT2000 GT21 model
GOT2000 GT23 model
LE7-40GU-L

Install updates from vendor's website.

GOT2000 GT27 model - update to 01.39.000
GT SoftGOT2000 Version1 - update to 1.255R
GOT SIMPLE GS21 model - update to 01.40.000
GOT2000 GT25 model - update to 01.39.000
GOT2000 GT21 model - update to 01.40.000
GOT2000 GT23 model - update to 01.39.000

• https://ics-cert.us-cert.gov/advisories/icsa-21-131-02
• https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-002_en.pdf

• Denial of service in Mitsubishi Electric GOT and Tension Controllers