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Fencer Intel
high 7.5

CVE-2018-7184 json

ntpd in ntp 4.2.8p4 before 4.2.8p11 drops bad packets before updating the "received" timestamp, which allows remote attackers to cause a de…

published 8y ago modified 4mo ago also EUVD-2018-18926

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
8.6%
EPSS 8.6% chance of exploitation in 30 days, percentile 95%
public exploits
0
none known

Summary

ntpd in ntp 4.2.8p4 before 4.2.8p11 drops bad packets before updating the "received" timestamp, which allows remote attackers to cause a denial of service (disruption) by sending a packet with a zero-origin timestamp causing the association to reset and setting the contents of the packet as the most recent timestamp. This issue is a result of an incomplete fix for CVE-2015-7704.

Patch / fix

  • ntp Debian 11 1:4.2.8p11+dfsg-1

debian advisories DEBIAN-CVE-2018-7184

  • ntp Ubuntu 18.04 LTS 1:4.2.8p10+dfsg-5ubuntu7.1

ubuntu advisories UBUNTU-CVE-2018-7184

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

Is CVE-2018-7184 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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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-2018-7184 updated cvss 3.1

ntp: Interleaved symmetric mode cannot recover from bad state

  • Red Hat Enterprise Linux 8 ntp
    affected: no fix available “Fix deferred”
  • 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

Exploit prediction

8.63% 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 3.0 7.5 CVSS:3.0/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.