{"id":"CVE-2009-3563","details":"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.","modified":"2026-04-10T03:40:55.743622Z","published":"2009-12-09T18:30:00Z","references":[{"type":"ADVISORY","url":"ftp://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2010-005.txt.asc"},{"type":"ADVISORY","url":"http://aix.software.ibm.com/aix/efixes/security/xntpd_advisory.asc"},{"type":"ADVISORY","url":"http://secunia.com/advisories/37629"},{"type":"ADVISORY","url":"http://secunia.com/advisories/37922"},{"type":"ADVISORY","url":"http://secunia.com/advisories/38764"},{"type":"ADVISORY","url":"http://secunia.com/advisories/38794"},{"type":"ADVISORY","url":"http://secunia.com/advisories/38832"},{"type":"ADVISORY","url":"http://secunia.com/advisories/38834"},{"type":"ADVISORY","url":"http://secunia.com/advisories/39593"},{"type":"ADVISORY","url":"http://www.vupen.com/english/advisories/2010/0510"},{"type":"ADVISORY","url":"http://www.vupen.com/english/advisories/2010/0528"},{"type":"ADVISORY","url":"http://www.vupen.com/english/advisories/2010/0993"},{"type":"ADVISORY","url":"https://rhn.redhat.com/errata/RHSA-2009-1648.html"},{"type":"ADVISORY","url":"https://rhn.redhat.com/errata/RHSA-2009-1651.html"},{"type":"ADVISORY","url":"https://rhn.redhat.com/errata/RHSA-2010-0095.html"},{"type":"FIX","url":"http://support.ntp.org/bin/view/Main/SecurityNotice#DoS_attack_from_certain_NTP_mode"},{"type":"FIX","url":"http://www.debian.org/security/2009/dsa-1948"},{"type":"FIX","url":"http://www.kb.cert.org/vuls/id/568372"},{"type":"FIX","url":"http://www.securityfocus.com/bid/37255"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=531213"},{"type":"WEB","url":"http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=560074"},{"type":"WEB","url":"http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10673"},{"type":"WEB","url":"http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10691"},{"type":"WEB","url":"http://lists.vmware.com/pipermail/security-announce/2010/000082.html"},{"type":"WEB","url":"http://marc.info/?l=bugtraq&m=130168580504508&w=2"},{"type":"WEB","url":"http://marc.info/?l=bugtraq&m=136482797910018&w=2"},{"type":"WEB","url":"http://security-tracker.debian.org/tracker/CVE-2009-3563"},{"type":"WEB","url":"http://securitytracker.com/id?1023298"},{"type":"WEB","url":"http://sunsolve.sun.com/search/document.do?assetkey=1-77-1021781.1-1"},{"type":"WEB","url":"http://support.avaya.com/css/P8/documents/100071808"},{"type":"WEB","url":"http://www-01.ibm.com/support/docview.wss?uid=isg1IZ68659"},{"type":"WEB","url":"http://www-01.ibm.com/support/docview.wss?uid=isg1IZ71047"},{"type":"WEB","url":"http://www.kb.cert.org/vuls/id/568372"},{"type":"WEB","url":"http://www.kb.cert.org/vuls/id/MAPG-7X7V6J"},{"type":"WEB","url":"http://www.kb.cert.org/vuls/id/MAPG-7X7VD7"},{"type":"WEB","url":"https://lists.ntp.org/pipermail/announce/2009-December/000086.html"},{"type":"WEB","url":"https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11225"},{"type":"WEB","url":"https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12141"},{"type":"WEB","url":"https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A19376"},{"type":"WEB","url":"https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7076"},{"type":"WEB","url":"https://support.ntp.org/bugs/show_bug.cgi?id=1331"},{"type":"WEB","url":"https://www.kb.cert.org/vuls/id/417980"},{"type":"WEB","url":"https://www.redhat.com/archives/fedora-package-announce/2009-December/msg00763.html"},{"type":"WEB","url":"https://www.redhat.com/archives/fedora-package-announce/2009-December/msg00809.html"}],"schema_version":"1.7.5"}