Junos OS: QFX5k: l2 loop in the overlay impacts the stability in a EVPN/VXLAN environment

An Improperly Implemented Security Check for Standard vulnerability in storm control of Juniper Networks Junos OS QFX5k devices allows packets to be punted to ARP queue causing a l2 loop resulting in a DDOS violations and DDOS syslog.

This issue is triggered when Storm control is enabled and ICMPv6 packets are present on device.

This issue affects Juniper Networks:

Junos OS

• All versions prior to 20.2R3-S6 on QFX5k;
• 20.3 versions prior to 20.3R3-S5 on QFX5k;
• 20.4 versions prior to 20.4R3-S5 on QFX5k;
• 21.1 versions prior to 21.1R3-S4 on QFX5k;
• 21.2 versions prior to 21.2R3-S3 on QFX5k;
• 21.3 versions prior to 21.3R3-S2 on QFX5k;
• 21.4 versions prior to 21.4R3 on QFX5k;
• 22.1 versions prior to 22.1R3 on QFX5k;
• 22.2 versions prior to 22.2R2 on QFX5k.