Gentoo Linux Security Advisory 202007-12 - Multiple vulnerabilities have been found in NTP, the worst of which could result in a Denial of Service condition. Versions less than 4.2.8_p15 are affected.
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Red Hat Security Advisory 2020-2663-01 - The Network Time Protocol is used to synchronize a computer's time with another referenced time source. These packages include the ntpd service which continuously adjusts system time and utilities used to query and configure the ntpd service. Issues addressed include a denial of service vulnerability.
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