DNS cache poisoning, the Internet attack from 2008, is back from the dead A newly found side channel in a widely used protocol lets attackers spoof domains. Dan Goodin – Nov 12, 2020 9:30 am | 67 ...

How OpenDNS, PowerDNS and MaraDNS remained unaffected by the DNS cache poisoning vulnerability It's 2001, and Daniel J. Written by Dancho Danchev, Contributor July 25, 2008 at 2:25 a.m. PT ...

Clearing the host cache frees does not delete data or free up space. It deletes the DNS entries only. If you want to clear some disk space, you have to clear the browsing cache which is different.