High severity7.5NVD Advisory· Published Jan 13, 2017· Updated Jun 17, 2026

CVE-2016-7426

Description

NTP before 4.2.8p9 rate limits responses received from the configured sources when rate limiting for all associations is enabled, which allows remote attackers to cause a denial of service (prevent responses from the sources) by sending responses with a spoofed source address.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

111

HPE/Hpux NTP
cpe:2.3:a:hpe:hpux-ntp:*:*:*:*:*:*:*:*
Range: >=b.11.31,<c.4.2.8.2.0
NTP/NTP72 versions
cpe:2.3:a:ntp:ntp:*:*:*:*:*:*:*:*+ 71 more
- cpe:2.3:a:ntp:ntp:*:*:*:*:*:*:*:*range: >=4.2.6,<4.2.8
- cpe:2.3:a:ntp:ntp:4.2.5:p203:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.5:p204:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.5:p205:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.5:p206:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.5:p207:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.5:p208:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.5:p209:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.5:p210:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.5:p211:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.5:p212:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.5:p213:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.5:p214:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.5:p215:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.5:p216:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.5:p217:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.5:p218:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.5:p219:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.5:p220:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.5:p221:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.5:p222:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.5:p223:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.5:p224:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.5:p225:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.5:p226:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.5:p227:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.5:p228:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.5:p229:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.5:p230:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.5:p231_rc1:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.5:p232_rc1:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.5:p233_rc1:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.5:p234_rc1:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.5:p235_rc1:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.5:p236_rc1:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.5:p237_rc1:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.5:p238_rc1:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.5:p239_rc1:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.5:p240_rc1:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.5:p241_rc1:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.5:p242_rc1:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.5:p243_rc1:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.5:p244_rc1:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.5:p245_rc1:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.5:p246_rc1:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.5:p247_rc1:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.5:p248_rc1:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.5:p249_rc1:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.5:p250_rc1:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.8:-:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.8:p1:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.8:p1-beta1:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.8:p1-beta2:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.8:p1-beta3:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.8:p1-beta4:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.8:p1-beta5:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.8:p1-rc1:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.8:p1-rc2:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.8:p2:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.8:p2-rc1:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.8:p2-rc2:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.8:p2-rc3:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.8:p3:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.8:p3-rc1:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.8:p3-rc2:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.8:p3-rc3:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.8:p4:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.8:p5:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.8:p6:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.8:p7:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.8:p8:*:*:*:*:*:*
- (no CPE)range: <4.2.8p9
Canonical/Ubuntu Linux
cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:esm:*:*:*
Red Hat/Enterprise Linux Desktop2 versions
cpe:2.3:o:redhat:enterprise_linux_desktop:6.0:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:redhat:enterprise_linux_desktop:6.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*
Red Hat/Enterprise Linux Server2 versions
cpe:2.3:o:redhat:enterprise_linux_server:6.0:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:redhat:enterprise_linux_server:6.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:*
Red Hat/Enterprise Linux Server Aus4 versions
cpe:2.3:o:redhat:enterprise_linux_server_aus:7.3:*:*:*:*:*:*:*+ 3 more
- cpe:2.3:o:redhat:enterprise_linux_server_aus:7.3:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_server_aus:7.4:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_server_aus:7.6:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_server_aus:7.7:*:*:*:*:*:*:*
Red Hat/Enterprise Linux Eus5 versions
cpe:2.3:o:redhat:enterprise_linux_server_eus:7.3:*:*:*:*:*:*:*+ 4 more
- cpe:2.3:o:redhat:enterprise_linux_server_eus:7.3:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_server_eus:7.4:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_server_eus:7.5:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_server_eus:7.6:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_server_eus:7.7:*:*:*:*:*:*:*
Red Hat/Enterprise Linux Server Tus3 versions
cpe:2.3:o:redhat:enterprise_linux_server_tus:7.3:*:*:*:*:*:*:*+ 2 more
- cpe:2.3:o:redhat:enterprise_linux_server_tus:7.3:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_server_tus:7.6:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_server_tus:7.7:*:*:*:*:*:*:*
Red Hat/Enterprise Linux Workstation2 versions
cpe:2.3:o:redhat:enterprise_linux_workstation:6.0:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:redhat:enterprise_linux_workstation:6.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:*
osv-coords19 versions
pkg:rpm/opensuse/ntp&distro=openSUSE%20Tumbleweed pkg:rpm/suse/ntp&distro=SUSE%20Linux%20Enterprise%20Desktop%2012%20SP1 pkg:rpm/suse/ntp&distro=SUSE%20Linux%20Enterprise%20Desktop%2012%20SP2 pkg:rpm/suse/ntp&distro=SUSE%20Linux%20Enterprise%20Point%20of%20Sale%2011%20SP3 pkg:rpm/suse/ntp&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP2-LTSS pkg:rpm/suse/ntp&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP3-LTSS pkg:rpm/suse/ntp&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP3-TERADATA pkg:rpm/suse/ntp&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4 pkg:rpm/suse/ntp&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP1 pkg:rpm/suse/ntp&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP2 pkg:rpm/suse/ntp&distro=SUSE%20Linux%20Enterprise%20Server%2012-LTSS pkg:rpm/suse/ntp&distro=SUSE%20Linux%20Enterprise%20Server%20for%20Raspberry%20Pi%2012%20SP2 pkg:rpm/suse/ntp&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2011%20SP4 pkg:rpm/suse/ntp&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012 pkg:rpm/suse/ntp&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP1 pkg:rpm/suse/ntp&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP2 pkg:rpm/suse/ntp&distro=SUSE%20Manager%202.1 pkg:rpm/suse/ntp&distro=SUSE%20Manager%20Proxy%202.1 pkg:rpm/suse/ntp&distro=SUSE%20OpenStack%20Cloud%205
< 4.2.8p9-1.1+ 18 more
- (no CPE)range: < 4.2.8p9-1.1
- (no CPE)range: < 4.2.8p9-55.1
- (no CPE)range: < 4.2.8p9-55.1
- (no CPE)range: < 4.2.8p9-48.9.1
- (no CPE)range: < 4.2.8p9-48.9.1
- (no CPE)range: < 4.2.8p9-48.9.1
- (no CPE)range: < 4.2.8p9-48.9.1
- (no CPE)range: < 4.2.8p9-57.2
- (no CPE)range: < 4.2.8p9-55.1
- (no CPE)range: < 4.2.8p9-55.1
- (no CPE)range: < 4.2.8p9-46.18.1
- (no CPE)range: < 4.2.8p9-55.1
- (no CPE)range: < 4.2.8p9-57.2
- (no CPE)range: < 4.2.8p9-46.18.1
- (no CPE)range: < 4.2.8p9-55.1
- (no CPE)range: < 4.2.8p9-55.1
- (no CPE)range: < 4.2.8p9-48.9.1
- (no CPE)range: < 4.2.8p9-48.9.1
- (no CPE)range: < 4.2.8p9-48.9.1

Patches

Vulnerability mechanics

References

nwtime.org/ntp428p9_release/nvdThird Party Advisory
rhn.redhat.com/errata/RHSA-2017-0252.htmlnvdThird Party Advisory
support.ntp.org/bin/view/Main/NtpBug3071nvdIssue TrackingMitigationVendor Advisory
support.ntp.org/bin/view/Main/SecurityNoticenvdRelease NotesVendor Advisory
www.securityfocus.com/bid/94451nvdThird Party AdvisoryVDB Entry
www.securitytracker.com/id/1037354nvdThird Party AdvisoryVDB Entry
bto.bluecoat.com/security-advisory/sa139nvdThird Party Advisory
h20566.www2.hpe.com/hpsc/doc/public/displaynvdThird Party Advisory
security.freebsd.org/advisories/FreeBSD-SA-16:39.ntp.ascnvdThird Party Advisory
usn.ubuntu.com/3707-2/nvdThird Party Advisory
www.kb.cert.org/vuls/id/633847nvdThird Party AdvisoryUS Government Resource

News mentions

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cvss	0.488
epss	0.010
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000