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An alert for massive security flaws in Intel, AMD and ARM processors that have been manufactured during the last 10 years was disclosed on January 3, 2018. This lead to describing two critical vulnerabilities - Spectre and Meltdown. In short: these vulnerabilities disclose the OS core's RAM and other processes to malicious programs that can exploit Meltdown and Spectre to get hold of secrets stored in the memory of other running programs. All modern computers, servers, smartphones and tablets are affected.
The time set in the DNS record TTL tells the DNS caching server for what period the record is considered up-to-date and can be stored in the cache. Typically, a TTL is set between 2 and 48 hours, and therefore, after changing the DNS information, a global refresh period of 2 to 48 hours is given.