Vulnerability identifier: #VU48953

Vulnerability risk: Medium

CVSSv3.1: 6.2 [CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-5665

CWE-ID: CWE-703

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
MELSEC iQ-F series FX5U(C) CPU module
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor: Mitsubishi Electric

Description

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

The vulnerability exists due to an improper check or handling of exceptional conditions issue. A local attacker can send a specially crafted ARP packet and cause a denial of service condition on the target system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

MELSEC iQ-F series FX5U(C) CPU module: 1.060

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External links
http://jvn.jp/vu/JVNVU95638588/index.html
http://us-cert.cisa.gov/ics/advisories/icsa-20-345-01
http://www.mitsubishielectric.co.jp/psirt/vulnerability/pdf/2020-018.pdf
http://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2020-018_en.pdf

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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