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Vulnerability record · CVE-2016-9042 · published 4 June 2018

CVE-2016-9042: Ntp improper input validation vulnerability

Ntp · Ntp

An exploitable denial of service vulnerability exists in the origin timestamp check functionality of ntpd 4.2.8p9. A specially crafted unauthenticated network packet can be used to reset the expected origin timestamp for target peers. Legitimate replies from targeted peers will fail the origin timestamp check (TEST2) causing the reply to be dropped and creating a denial of service condition.

5.9 CVSS 3.1 Medium EPSS 3.9% · top 10.0% CWE-20 · Improper input validation
5.9CVSS 3.1 base score, v2 4.3
3.9%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
42References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

An exploitable denial of service vulnerability exists in the origin timestamp check functionality of ntpd 4.2.8p9. A specially crafted unauthenticated network packet can be used to reset the expected origin timestamp for target peers. Legitimate replies from targeted peers will fail the origin timestamp check (TEST2) causing the reply to be dropped and creating a denial of service condition.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

4 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://packetstormsecurity.com/files/142101/FreeBSD-Security-Advisory-FreeBSD-SA-17-03.ntp.html
http://packetstormsecurity.com/files/142284/Slackware-Security-Advisory-ntp-Updates.html
http://seclists.org/fulldisclosure/2017/Nov/7
http://seclists.org/fulldisclosure/2017/Sep/62
http://www.securityfocus.com/archive/1/540403/100/0/threaded
http://www.securityfocus.com/archive/1/archive/1/540403/100/0/threaded
http://www.securityfocus.com/archive/1/archive/1/540464/100/0/threaded
http://www.securityfocus.com/bid/97046 Permissions RequiredThird Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1038123 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1039427 Third Party AdvisoryVDB Entry
http://www.ubuntu.com/usn/USN-3349-1
https://bto.bluecoat.com/security-advisory/sa147
https://cert-portal.siemens.com/productcert/pdf/ssa-211752.pdf Third Party Advisory
https://kc.mcafee.com/corporate/index?page=content&id=SB10201
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7KVLFA3J43QFIP4I7HE7KQ5
https://security.FreeBSD.org/advisories/FreeBSD-SA-17:03.ntp.asc Third Party Advisory
https://support.apple.com/kb/HT208144
https://support.f5.com/csp/article/K39041624
https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03962en_us Third Party Advisory
https://us-cert.cisa.gov/ics/advisories/icsa-21-159-11
https://www.talosintelligence.com/vulnerability_reports/TALOS-2016-0260 ExploitMitigationThird Party Advisory
http://packetstormsecurity.com/files/142101/FreeBSD-Security-Advisory-FreeBSD-SA-17-03.ntp.html
http://packetstormsecurity.com/files/142284/Slackware-Security-Advisory-ntp-Updates.html
http://seclists.org/fulldisclosure/2017/Nov/7
http://seclists.org/fulldisclosure/2017/Sep/62
http://www.securityfocus.com/archive/1/540403/100/0/threaded
http://www.securityfocus.com/archive/1/archive/1/540403/100/0/threaded
http://www.securityfocus.com/archive/1/archive/1/540464/100/0/threaded
http://www.securityfocus.com/bid/97046 Permissions RequiredThird Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1038123 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1039427 Third Party AdvisoryVDB Entry
http://www.ubuntu.com/usn/USN-3349-1
https://bto.bluecoat.com/security-advisory/sa147
https://cert-portal.siemens.com/productcert/pdf/ssa-211752.pdf Third Party Advisory
https://kc.mcafee.com/corporate/index?page=content&id=SB10201
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7KVLFA3J43QFIP4I7HE7KQ5
https://security.FreeBSD.org/advisories/FreeBSD-SA-17:03.ntp.asc Third Party Advisory
https://support.apple.com/kb/HT208144
https://support.f5.com/csp/article/K39041624
https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03962en_us Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2016-9042), CISA KEV, FIRST EPSS (scores of 2026-10-07). This page is refreshed as NVD updates the record.