CVE-2021-20586

Resource management errors vulnerability in a robot controller of MELFA FR Series(controller “CR800-VD” of RV-FR**-D-* all versions, controller "CR800-HD" of RH-FRH*-D-* all versions, controller "CR800-HRD" of RH-FRHR*-D-* all versions, controller “CR800-VR with R16RTCPU” of RV-FR**-R-* all versions, controller "CR800-HR with R16RTCPU" of RH-FRH*-R-* all versions, controller "CR800-HRR with R16RTCPU" of RH-FRHR*-R-* all versions, controller “CR800-VQ with Q172DSRCPU” of RV-FR**-Q-* all versions, controller "CR800-HQ with Q172DSRCPU" of RH-FRH*-Q-* all versions, controller "CR800-HRQ with Q172DSRCPU" of RH-FRHR*-Q-* all versions) and a robot controller of MELFA CR Series(controller “CR800-CVD” of RV-8CRL-D-* all versions, controller “CR800-CHD” of RH-CRH*-D-* all versions) as well as a cooperative robot ASSISTA(controller “CR800-05VD” of RV-5AS-D-* all versions) allows a remote unauthenticated attacker to cause a DoS of the execution of the robot program and the Ethernet communication by sending a large amount of packets in burst over a short period of time. As a result of DoS, an error may occur. A reset is required to recover it if the error occurs.