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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.

    Published:Dec 8, 2009
    Last Modified:Apr 23, 2026
    EPS:Dec 9, 2009
    EPSS Score:0.79631
    CVSS Score:6.4

    Affected Products

    Vendor
    Ntp
    Product
    Ntp
    Vendor
    Redhat
    Product
    Enterprise Linux

    Exploits

    No exploit reference

    Common Weakness Enumeration

    No CWE recorded yet

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    CVE-2023-26555 (CVSS 6.4) — praecis_parse in ntpd/refclock_palisade.c in NTP 4.2.8p15 has an out-of-bounds write. Any attack method would …
    CVE-2023-26552 (CVSS 5.6) — mstolfp in libntp/mstolfp.c in NTP 4.2.8p15 has an out-of-bounds write when adding a decimal point. An adversa…
    CVE-2023-26553 (CVSS 5.6) — mstolfp in libntp/mstolfp.c in NTP 4.2.8p15 has an out-of-bounds write when copying the trailing number. An ad…
    CVE-2023-26551 (CVSS 5.6) — mstolfp in libntp/mstolfp.c in NTP 4.2.8p15 has an out-of-bounds write in the cp<cpdec while loop. An adversar…
    CVE-2020-15025 (CVSS 4.4) — ntpd in ntp 4.2.8 before 4.2.8p15 and 4.3.x before 4.3.101 allows remote attackers to cause a denial of servic…
    CVE-2018-8956 (CVSS 5.3) — ntpd in ntp 4.2.8p10, 4.2.8p11, 4.2.8p12 and 4.2.8p13 allow remote attackers to prevent a broadcast client fro…
    CVE-2020-11868 (CVSS 7.5) — ntpd in ntp before 4.2.8p14 and 4.3.x before 4.3.100 allows an off-path attacker to block unauthenticated sync…
    CVE-2020-13817 (CVSS 7.4) — ntpd in ntp before 4.2.8p14 and 4.3.x before 4.3.100 allows remote attackers to cause a denial of service (dae…
    CVE-2019-11331 (CVSS 8.1) — Network Time Protocol (NTP), as specified in RFC 5905, uses port 123 even for modes where a fixed port number …

    References

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

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High