Vulnerability Monitor

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CVE-2009-3563

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.

Security Impact Summary

CVE-2009-3563 is a security vulnerability that . Impacting 1 product from ntp organizations running these solutions should prioritize assessment and patching.

Historical Context

Originally identified in 2009, this vulnerability predates many modern security frameworks and practices. The vulnerability landscape of that era was characterized by different threat models and less mature defense mechanisms compared to contemporary standards.

Published

2009-12-09T18:30:00.390

Last Modified

2025-04-09T00:30:58.490

Status

Deferred

Source

[email protected]

Severity

CVSSv2: 6.4 (MEDIUM)

CVSSv2 Vector

AV:N/AC:L/Au:N/C:N/I:P/A:P

Access Vector: NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: NONE
Integrity Impact: PARTIAL
Availability Impact: PARTIAL

Exploitability Score

10.0

Impact Score

4.9

Weaknesses

Type: Primary
NVD-CWE-Other

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	ntp	ntp	≤ 4.2.2p4	Yes
Application	ntp	ntp	4.0.72	Yes
Application	ntp	ntp	4.0.73	Yes
Application	ntp	ntp	4.0.90	Yes
Application	ntp	ntp	4.0.91	Yes
Application	ntp	ntp	4.0.92	Yes
Application	ntp	ntp	4.0.93	Yes
Application	ntp	ntp	4.0.94	Yes
Application	ntp	ntp	4.0.95	Yes
Application	ntp	ntp	4.0.96	Yes
Application	ntp	ntp	4.0.97	Yes
Application	ntp	ntp	4.0.98	Yes
Application	ntp	ntp	4.0.99	Yes
Application	ntp	ntp	4.1.0	Yes
Application	ntp	ntp	4.1.2	Yes
Application	ntp	ntp	4.2.0	Yes
Application	ntp	ntp	4.2.2	Yes
Application	ntp	ntp	4.2.2p1	Yes
Application	ntp	ntp	4.2.2p2	Yes
Application	ntp	ntp	4.2.2p3	Yes
Application	ntp	ntp	4.2.5	Yes

References

ftp://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2010-005.txt.asc ([email protected])
http://aix.software.ibm.com/aix/efixes/security/xntpd_advisory.asc ([email protected])
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=560074 ([email protected])
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10673 ([email protected])
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10691 ([email protected])
http://lists.vmware.com/pipermail/security-announce/2010/000082.html ([email protected])
http://marc.info/?l=bugtraq&m=130168580504508&w=2 ([email protected])
http://marc.info/?l=bugtraq&m=136482797910018&w=2 ([email protected])
http://secunia.com/advisories/37629 ([email protected])
http://secunia.com/advisories/37922 ([email protected])
http://secunia.com/advisories/38764 ([email protected])
http://secunia.com/advisories/38794 ([email protected])
http://secunia.com/advisories/38832 ([email protected])
http://secunia.com/advisories/38834 ([email protected])
http://secunia.com/advisories/39593 ([email protected])
http://security-tracker.debian.org/tracker/CVE-2009-3563 ([email protected])
http://securitytracker.com/id?1023298 ([email protected])
http://sunsolve.sun.com/search/document.do?assetkey=1-77-1021781.1-1 ([email protected])
http://support.avaya.com/css/P8/documents/100071808 ([email protected])
http://support.ntp.org/bin/view/Main/SecurityNotice#DoS_attack_from_certain_NTP_mode Patch ([email protected])
http://www-01.ibm.com/support/docview.wss?uid=isg1IZ68659 ([email protected])
http://www-01.ibm.com/support/docview.wss?uid=isg1IZ71047 ([email protected])
http://www.debian.org/security/2009/dsa-1948 Patch ([email protected])
http://www.kb.cert.org/vuls/id/568372 Patch, US Government Resource ([email protected])
http://www.kb.cert.org/vuls/id/MAPG-7X7V6J ([email protected])
http://www.kb.cert.org/vuls/id/MAPG-7X7VD7 ([email protected])
http://www.securityfocus.com/bid/37255 Patch ([email protected])
http://www.vupen.com/english/advisories/2010/0510 ([email protected])
http://www.vupen.com/english/advisories/2010/0528 ([email protected])
http://www.vupen.com/english/advisories/2010/0993 ([email protected])
https://bugzilla.redhat.com/show_bug.cgi?id=531213 ([email protected])
https://lists.ntp.org/pipermail/announce/2009-December/000086.html ([email protected])
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11225 ([email protected])
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12141 ([email protected])
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A19376 ([email protected])
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7076 ([email protected])
https://rhn.redhat.com/errata/RHSA-2009-1648.html ([email protected])
https://rhn.redhat.com/errata/RHSA-2009-1651.html ([email protected])
https://rhn.redhat.com/errata/RHSA-2010-0095.html ([email protected])
https://support.ntp.org/bugs/show_bug.cgi?id=1331 ([email protected])
https://www.kb.cert.org/vuls/id/417980 ([email protected])
https://www.redhat.com/archives/fedora-package-announce/2009-December/msg00763.html ([email protected])
https://www.redhat.com/archives/fedora-package-announce/2009-December/msg00809.html ([email protected])
ftp://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2010-005.txt.asc (af854a3a-2127-422b-91ae-364da2661108)
http://aix.software.ibm.com/aix/efixes/security/xntpd_advisory.asc (af854a3a-2127-422b-91ae-364da2661108)
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=560074 (af854a3a-2127-422b-91ae-364da2661108)
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10673 (af854a3a-2127-422b-91ae-364da2661108)
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10691 (af854a3a-2127-422b-91ae-364da2661108)
http://lists.vmware.com/pipermail/security-announce/2010/000082.html (af854a3a-2127-422b-91ae-364da2661108)
http://marc.info/?l=bugtraq&m=130168580504508&w=2 (af854a3a-2127-422b-91ae-364da2661108)
http://marc.info/?l=bugtraq&m=136482797910018&w=2 (af854a3a-2127-422b-91ae-364da2661108)
http://secunia.com/advisories/37629 (af854a3a-2127-422b-91ae-364da2661108)
http://secunia.com/advisories/37922 (af854a3a-2127-422b-91ae-364da2661108)
http://secunia.com/advisories/38764 (af854a3a-2127-422b-91ae-364da2661108)
http://secunia.com/advisories/38794 (af854a3a-2127-422b-91ae-364da2661108)
http://secunia.com/advisories/38832 (af854a3a-2127-422b-91ae-364da2661108)
http://secunia.com/advisories/38834 (af854a3a-2127-422b-91ae-364da2661108)
http://secunia.com/advisories/39593 (af854a3a-2127-422b-91ae-364da2661108)
http://security-tracker.debian.org/tracker/CVE-2009-3563 (af854a3a-2127-422b-91ae-364da2661108)
http://securitytracker.com/id?1023298 (af854a3a-2127-422b-91ae-364da2661108)
http://sunsolve.sun.com/search/document.do?assetkey=1-77-1021781.1-1 (af854a3a-2127-422b-91ae-364da2661108)
http://support.avaya.com/css/P8/documents/100071808 (af854a3a-2127-422b-91ae-364da2661108)
http://support.ntp.org/bin/view/Main/SecurityNotice#DoS_attack_from_certain_NTP_mode Patch (af854a3a-2127-422b-91ae-364da2661108)
http://www-01.ibm.com/support/docview.wss?uid=isg1IZ68659 (af854a3a-2127-422b-91ae-364da2661108)
http://www-01.ibm.com/support/docview.wss?uid=isg1IZ71047 (af854a3a-2127-422b-91ae-364da2661108)
http://www.debian.org/security/2009/dsa-1948 Patch (af854a3a-2127-422b-91ae-364da2661108)
http://www.kb.cert.org/vuls/id/568372 Patch, US Government Resource (af854a3a-2127-422b-91ae-364da2661108)
http://www.kb.cert.org/vuls/id/MAPG-7X7V6J (af854a3a-2127-422b-91ae-364da2661108)
http://www.kb.cert.org/vuls/id/MAPG-7X7VD7 (af854a3a-2127-422b-91ae-364da2661108)
http://www.securityfocus.com/bid/37255 Patch (af854a3a-2127-422b-91ae-364da2661108)
http://www.vupen.com/english/advisories/2010/0510 (af854a3a-2127-422b-91ae-364da2661108)
http://www.vupen.com/english/advisories/2010/0528 (af854a3a-2127-422b-91ae-364da2661108)
http://www.vupen.com/english/advisories/2010/0993 (af854a3a-2127-422b-91ae-364da2661108)
https://bugzilla.redhat.com/show_bug.cgi?id=531213 (af854a3a-2127-422b-91ae-364da2661108)
https://lists.ntp.org/pipermail/announce/2009-December/000086.html (af854a3a-2127-422b-91ae-364da2661108)
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11225 (af854a3a-2127-422b-91ae-364da2661108)
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12141 (af854a3a-2127-422b-91ae-364da2661108)
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A19376 (af854a3a-2127-422b-91ae-364da2661108)
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7076 (af854a3a-2127-422b-91ae-364da2661108)
https://rhn.redhat.com/errata/RHSA-2009-1648.html (af854a3a-2127-422b-91ae-364da2661108)
https://rhn.redhat.com/errata/RHSA-2009-1651.html (af854a3a-2127-422b-91ae-364da2661108)
https://rhn.redhat.com/errata/RHSA-2010-0095.html (af854a3a-2127-422b-91ae-364da2661108)
https://support.ntp.org/bugs/show_bug.cgi?id=1331 (af854a3a-2127-422b-91ae-364da2661108)
https://www.kb.cert.org/vuls/id/417980 (af854a3a-2127-422b-91ae-364da2661108)
https://www.redhat.com/archives/fedora-package-announce/2009-December/msg00763.html (af854a3a-2127-422b-91ae-364da2661108)
https://www.redhat.com/archives/fedora-package-announce/2009-December/msg00809.html (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For ntp's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.