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Fencer Intel
high 7.5

CVE-2018-7185 json

The protocol engine in ntp 4.2.6 before 4.2.8p11 allows a remote attackers to cause a denial of service (disruption) by continually sending…

published 2018-03-06 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-18927

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
9.0%
EPSS 9.0% chance of exploitation in 30 days, percentile 95%
public exploits
0
none known

Summary

The protocol engine in ntp 4.2.6 before 4.2.8p11 allows a remote attackers to cause a denial of service (disruption) by continually sending a packet with a zero-origin timestamp and source IP address of the "other side" of an interleaved association causing the victim ntpd to reset its association.

Patch / fix

  • ntp ntp 4.2.8
  • synology router_manager 1.1.6-6931-3
  • synology skynas 6.1.5-15254
  • synology virtual_diskstation_manager 6.1.6-15266
  • hpe hpux-ntp c.4.2.8.4.0
  • synology diskstation_manager 6.1.6-15266
  • synology vs960hd_firmware 2.2.3-1505
  • oracle fujitsu_m10-1_firmware xcp2361, xcp3070
  • oracle fujitsu_m10-4_firmware xcp2361, xcp3070
  • oracle fujitsu_m10-4s_firmware xcp2361, xcp3070
  • oracle fujitsu_m12-1_firmware xcp2361, xcp3070
  • oracle fujitsu_m12-2_firmware xcp2361, xcp3070
  • oracle fujitsu_m12-2s_firmware xcp2361, xcp3070
  • ntp Debian 11 1:4.2.8p11+dfsg-1

debian advisories DEBIAN-CVE-2018-7185

  • ntp Ubuntu 14.04 LTS 1:4.2.6.p5+dfsg-3ubuntu2.14.04.13
  • ntp Ubuntu 16.04 LTS 1:4.2.8p4+dfsg-3ubuntu5.9
  • ntp Ubuntu 18.04 LTS 1:4.2.8p10+dfsg-5ubuntu7.1

ubuntu advisories UBUNTU-CVE-2018-7185

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • ntp SLES 12 SP3, SLES 12 SP2-BCL, SLED 12 SP3 +7 more 4.2.8p11-64.5.1
  • ntp SLES for SAP 12 SP3, SLES 12 SP3, SLED 12 SP3 4.2.8p11-64.3.2
  • ntp SLES for SAP 11 SP4, SLES 11 SP4 4.2.8p11-64.4.1
  • ntp SLES 12-LTSS 4.2.8p11-46.26.2

suse advisories SUSE-SU-2018:1765-2SUSE-SU-2018:1765-1SUSE-SU-2018:1464-1SUSE-SU-2018:0956-1SUSE-SU-2018:0808-1

  • ntp openSUSE Tumbleweed 4.2.8p15-7.2

opensuse advisories openSUSE-SU-2024:11102-1

  • ntp Arch Linux 4.2.8.p11-1

arch linux advisories AVG-647

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-2018-7185 updated cvss 3.1

ntp: Unauthenticated packet can reset authenticated interleaved association

  • Red Hat Enterprise Linux 6 ntp, ntpdate, ntp-perl Red Hat Enterprise Linux 7 ntp, sntp, ntpdate, ntp-perl
    affected: workaround, no fix planned “Remove the "xleave" option from the "peer HOST xleave" lines in your ntp.conf if it exists, to entirely disable interleaved mode.”
  • Red Hat Enterprise Linux 8 ntp
    affected: workaround, no fix available “Remove the "xleave" option from the "peer HOST xleave" lines in your ntp.conf if it exists, to entirely disable interleaved mode.”
  • Red Hat Enterprise Linux 5 ntp
    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

Exploit prediction

9.00% chance of exploitation in the next 30 days, higher than 95% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

References

Sources

Fencer Intel 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.