Security Concerns
Only a few security problems have been identified in the reference implementation of the NTP codebase in its 25+ year history. The protocol has been undergoing revision and review over its entire history. As of January 2011, there are no security revisions in the NTP specification and no reports at CERT. The current codebase for the reference implementation has been undergoing security audits from several sources for several years now, and there are no known high-risk vulnerabilities in the current released software.
Read more about this topic: Network Time Protocol
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