Vulnerability identifier: #VU59227

Vulnerability risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-20607

CWE-ID: CWE-191

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
GX Works2
Client/Desktop applications / Software for system administration
MELSOFT Navigator
Client/Desktop applications / Software for system administration
EZSockdet
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 integer underflow. A remote attacker can trick a victim to open a specially crafted file, trigger integer underflow and cause a denial of service condition on the target system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

GX Works2: 1.606G

MELSOFT Navigator: All versions

EZSockdet: All versions

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External links
http://jvn.jp/vu/JVNVU93817405/index.html
http://us-cert.cisa.gov/ics/advisories/icsa-21-350-05
http://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-021_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.