The amount of NTP (Network Time Protocol) servers that could be exploited for massive distributed denial-of-service attacks has decreased to over 17,000 in May, from a total of 432,120 available worldwide in December 2013.
Vulnerable NTP servers, normally used for time synchronization, can be employed to amplify a distributed denial-of-service attack (DDoS) because of the monlist function, which can be used to query the IP addresses of the last 600 clients that have synchronized…
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