Vulnerability identifier: #VU53140

Vulnerability risk: Medium

CVSSv3.1: 5.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-20589

CWE-ID: CWE-119

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
GOT2000 GT27 model
Server applications / SCADA systems
GOT2000 GT25 model
Server applications / SCADA systems
GOT2000 GT23 model
Server applications / SCADA systems
GOT2000 GT21 model
Server applications / SCADA systems
GOT SIMPLE GS21 model
Server applications / SCADA systems
GT SoftGOT2000 Version1
Server applications / SCADA systems
LE7-40GU-L
Hardware solutions / Firmware

Vendor: Mitsubishi Electric

Description

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.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

GOT2000 GT27 model: 01.19.000 - 01.38.000

GOT2000 GT25 model: 01.19.000 - 01.38.000

GOT2000 GT23 model: 01.19.000 - 01.38.000

GOT2000 GT21 model: 01.21.000 - 01.39.000

GOT SIMPLE GS21 model: 01.21.000 - 01.39.000

GT SoftGOT2000 Version1: 1.170C - 1.250L

LE7-40GU-L: 1.00

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

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.