Today (2020-03-25) at 17:17. I received an email of "NetScreen Event Alarms Reported" from my firewall.
It shows a list of "systm-emergency-00006: Treadrop attack!" from an IP address. Which the date were all "2020-03-11".
Is this a normal behavior that the firewall send me the event alarms that was happen 2 weeks ago?