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…

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.

Scores

EPSS (exploitation in 30 days)

32.1% · top 1.7% of all CVEs (4 Nov 2026)

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.4.

Weakness

• n/a

Affected products

• n/a

  • affected n/a

References (42)

• VU#568372 (opens in a new tab)third-party-advisoryx_transferred
• 38832 (opens in a new tab)third-party-advisoryx_transferred
• http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10673 (opens in a new tab)x_transferred
• oval:org.mitre.oval:def:11225 (opens in a new tab)vdb-entrysignaturex_transferred
• http://support.avaya.com/css/P8/documents/100071808 (opens in a new tab)x_transferred
• 38794 (opens in a new tab)third-party-advisoryx_transferred
• [security-announce] 20100303 VMSA-2010-0004 ESX Service Console and vMA third party updates (opens in a new tab)mailing-listx_transferred
• FEDORA-2009-13121 (opens in a new tab)vendor-advisoryx_transferred
• https://bugzilla.redhat.com/show_bug.cgi?id=531213 (opens in a new tab)x_transferred
• 38764 (opens in a new tab)third-party-advisoryx_transferred
• http://support.ntp.org/bin/view/Main/SecurityNotice#DoS_attack_from_certain_NTP_mode (opens in a new tab)x_transferred
• http://www.kb.cert.org/vuls/id/MAPG-7X7V6J (opens in a new tab)x_transferred
• oval:org.mitre.oval:def:19376 (opens in a new tab)vdb-entrysignaturex_transferred
• 37255 (opens in a new tab)vdb-entryx_transferred
• SSRT101144 (opens in a new tab)vendor-advisoryx_transferred
• 39593 (opens in a new tab)third-party-advisoryx_transferred
• IZ71047 (opens in a new tab)vendor-advisoryx_transferred
• ADV-2010-0993 (opens in a new tab)vdb-entryx_transferred
• DSA-1948 (opens in a new tab)vendor-advisoryx_transferred
• http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=560074 (opens in a new tab)x_transferred
• http://aix.software.ibm.com/aix/efixes/security/xntpd_advisory.asc (opens in a new tab)x_transferred
• HPSBUX02639 (opens in a new tab)vendor-advisoryx_transferred
• 1021781 (opens in a new tab)vendor-advisoryx_transferred
• IZ68659 (opens in a new tab)vendor-advisoryx_transferred
• https://support.ntp.org/bugs/show_bug.cgi?id=1331 (opens in a new tab)x_transferred
• oval:org.mitre.oval:def:7076 (opens in a new tab)vdb-entrysignaturex_transferred
• 37922 (opens in a new tab)third-party-advisoryx_transferred
• 38834 (opens in a new tab)third-party-advisoryx_transferred
• FEDORA-2009-13090 (opens in a new tab)vendor-advisoryx_transferred
• http://security-tracker.debian.org/tracker/CVE-2009-3563 (opens in a new tab)x_transferred
• 1023298 (opens in a new tab)vdb-entryx_transferred
• oval:org.mitre.oval:def:12141 (opens in a new tab)vdb-entrysignaturex_transferred
• RHSA-2009:1651 (opens in a new tab)vendor-advisoryx_transferred
• 37629 (opens in a new tab)third-party-advisoryx_transferred
• RHSA-2010:0095 (opens in a new tab)vendor-advisoryx_transferred
• http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10691 (opens in a new tab)x_transferred
• [announce] 20091208 NTP 4.2.4p8 Released (opens in a new tab)mailing-listx_transferred
• ADV-2010-0510 (opens in a new tab)vdb-entryx_transferred
• RHSA-2009:1648 (opens in a new tab)vendor-advisoryx_transferred
• http://www.kb.cert.org/vuls/id/MAPG-7X7VD7 (opens in a new tab)x_transferred
• ADV-2010-0528 (opens in a new tab)vdb-entryx_transferred
• VU#417980 (opens in a new tab)third-party-advisoryx_transferred

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2009-3563](https://trackcve.app/badge/CVE-2009-3563.svg)](https://trackcve.app/cve/CVE-2009-3563)

Record last updated 7 Aug 2024, 06:31 UTC.