Gentoo Linux Security Advisory 201001-1 – A Denial of Service condition in ntpd can cause excessive CPU or bandwidth consumption. Robin Park and Dmitri Vinokurov discovered that ntp_request.c in ntpd does not handle MODE_PRIVATE packets correctly, causing a continuous exchange of MODE_PRIVATE error responses between two NTP daemons or causing high CPU load on a single host. Versions less than 4.2.4_p7-r1 are affected.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/84704/glsa-201001-01.txt
Source: https://packetstormsecurity.com/files/84704/Gentoo-Linux-Security-Advisory-201001-1.html