VULNERABILITY INTELLIGENCE
CVE-2009-3563
CVSS score6.4 MEDIUM
EPSS probability32.06%
CISA KEVNot currently listed
Published2009-12-09
Last modified2026-06-16
CVSS vectorAV:N/AC:L/Au:N/C:N/I:P/A:P
Description
ntp_request.c in ntpd in NTP before 4.2.4p8, and 4.2.5, allows remote attackers to cause a denial of service (CPU and bandwidth consumption) by using MODE_PRIVATE to send a spoofed (1) request or (2) response packet that triggers a continuous exchange of MODE_PRIVATE error responses between two NTP daemons.