Vulnerability Monitor

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CVE-2020-5665

Improper check or handling of exceptional conditions in MELSEC iQ-F series FX5U(C) CPU unit firmware version 1.060 and earlier allows an attacker to cause a denial-of-service (DoS) condition on program execution and communication by sending a specially crafted ARP packet.

Security Impact Summary

This vulnerability carries a HIGH severity rating with a CVSS v3.1 score of 7.4, indicating it requires adjacent network access with relatively low complexity without requiring user interaction and does not require pre-existing privileges . The vulnerability impacts and availability (service disruption) for affected systems. Impacting 2 products from mitsubishielectric, from mitsubishielectric organizations running these solutions should prioritize assessment and patching.

Historical Context

Reported in 2020, this vulnerability emerged during an era marked by increased sophistication in supply chain attacks, cloud infrastructure vulnerabilities, and software-as-a-service (SaaS) security challenges. Security practices during this period emphasized zero-trust architectures, container security, and API protection.

Published

2020-12-14T03:15:13.653

Last Modified

2024-11-21T05:34:26.877

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 7.4 (HIGH)

CVSSv2 Vector

AV:A/AC:L/Au:N/C:N/I:N/A:P

Access Vector: ADJACENT_NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: NONE
Integrity Impact: NONE
Availability Impact: PARTIAL

Exploitability Score

6.5

Impact Score

2.9

Weaknesses

Type: Primary
NVD-CWE-noinfo

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Operating System	mitsubishielectric	melsec_iq-f_fx5u_cpu_firmware	≤ 1.060	Yes
Hardware	mitsubishielectric	melsec_iq-f_fx5u_cpu	-	No

References

https://jvn.jp/vu/JVNVU95638588/index.html Third Party Advisory ([email protected])
https://us-cert.cisa.gov/ics/advisories/icsa-20-345-01 Third Party Advisory, US Government Resource ([email protected])
https://www.mitsubishielectric.co.jp/psirt/vulnerability/pdf/2020-018.pdf Vendor Advisory ([email protected])
https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2020-018_en.pdf Vendor Advisory ([email protected])
https://jvn.jp/vu/JVNVU95638588/index.html Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://us-cert.cisa.gov/ics/advisories/icsa-20-345-01 Third Party Advisory, US Government Resource (af854a3a-2127-422b-91ae-364da2661108)
https://www.mitsubishielectric.co.jp/psirt/vulnerability/pdf/2020-018.pdf Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2020-018_en.pdf Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For mitsubishielectric's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.