Vulnerability identifier: #VU59224

Vulnerability risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-20608

CWE-ID: CWE-130

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
GX Works2
Client/Desktop applications / Software for system administration

Vendor: Mitsubishi Electric

Description

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

The vulnerability exists due to improper handlingof length field that is inconsistent with the actual length of the associated data. A remote attacker can send a specially crafted packet to the PLC and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

GX Works2: 1.606G

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External links
http://us-cert.cisa.gov/ics/advisories/icsa-21-350-04
http://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-020_en.pdf
http://jvn.jp/vu/JVNVU93019896/index.html

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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.