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Fencer Vulns
low 3.7

CVE-2016-9042 json

An exploitable denial of service vulnerability exists in the origin timestamp check functionality of ntpd 4.2.8p9.

published 2018-06-04 8 y ago modified 2026-06-17 4 mo ago also EUVD-2016-9863

cvss
3.7
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
3.9%
EPSS 3.9% chance of exploitation in 30 days, percentile 90%
public exploits
0
none known

Summary

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.

Patch / fix

  • hpe hpux-ntp c.4.2.8.4.0
  • ntp Debian 11 1:4.2.8p10+dfsg-1

debian advisories DEBIAN-CVE-2016-9042

  • ntp SLES for SAP 11 SP4, SLES 11 SP4 4.2.8p10-63.1
  • ntp SLES for SAP 12 SP2, SLES for SAP 12 SP1, SLES for Raspberry Pi 12 SP2 +4 more 4.2.8p10-60.1
  • ntp SLES for SAP 12, SLES 12-LTSS 4.2.8p10-46.23.1

suse advisories SUSE-SU-2017:1052-1SUSE-SU-2017:1047-1SUSE-SU-2017:1048-1

  • ntp openSUSE Tumbleweed 4.2.8p15-7.2

opensuse advisories openSUSE-SU-2024:11102-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2016-9042 updated cvss 5.9

ntp: DoS via origin timestamp check functionality

  • Red Hat Enterprise Linux 5 ntp Red Hat Enterprise Linux 6 ntp, ntpdate, ntp-perl Red Hat Enterprise Linux 7 ntp, sntp, ntpdate, ntp-perl
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-21-159-11 updated cvss 5.9

Siemens SIMATIC NET CP 443-1 OPC UA

  • Siemens SIMATIC CP 443-1 OPC UA
    affected: mitigation, no fix planned

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

Exploit prediction

3.91% chance of exploitation in the next 30 days, higher than 90% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • talosintelligence.com https://www.talosintelligence.com/vulnerability_reports/TALOS-2016-0260 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.0 3.7 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
NVD 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P

Affected products

  • Talos Network Time Protocol

Classification

Weakness
  • CWE-20 Improper Input Validation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.