CVE-2021-20591

Name of the Vulnerable Software and Affected Versions: Mitsubishi Electric MELSEC iQ-R series CPU modules versions R00/01/02CPU all versions Mitsubishi Electric MELSEC iQ-R series CPU modules versions R04/08/16/32/120(EN)CPU all versions Mitsubishi Electric MELSEC iQ-R series CPU modules versions R08/16/32/120SFCPU all versions Mitsubishi Electric MELSEC iQ-R series CPU modules versions R08/16/32/120PCPU all versions Mitsubishi Electric MELSEC iQ-R series CPU modules versions R08/16/32/120PSFCPU all versions

Description: The issue allows a remote unauthenticated attacker to prevent legitimate clients from connecting to the MELSOFT transmission port (TCP/IP) by not closing a connection properly, which may lead to a denial of service (DoS) condition.

Recommendations: At the moment, there is no information about a newer version that contains a fix for this vulnerability.