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Fencer Vulns
critical 9.8

CVE-2018-12327 in the critical feed json

Stack-based buffer overflow in ntpq and ntpdc of NTP version 4.2.8p11 allows an attacker to achieve code execution or escalate to higher pr…

published 2018-06-20 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-4301

cvss
9.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
27.5%
EPSS 27.5% chance of exploitation in 30 days, percentile 98%
public exploits
1
Exploit-DB

Summary

Stack-based buffer overflow in ntpq and ntpdc of NTP version 4.2.8p11 allows an attacker to achieve code execution or escalate to higher privileges via a long string as the argument for an IPv4 or IPv6 command-line parameter. NOTE: It is unclear whether there are any common situations in which ntpq or ntpdc is used with a command line from an untrusted source.

Patch / fix

  • ntp Ubuntu 16.04 LTS 1:4.2.8p4+dfsg-3ubuntu5.10
  • ntp Ubuntu Pro 14.04 LTS 1:4.2.6.p5+dfsg-3ubuntu2.14.04.13+esm1
  • ntp Ubuntu Pro 18.04 LTS 1:4.2.8p10+dfsg-5ubuntu7.3+esm1

ubuntu advisories UBUNTU-CVE-2018-12327

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 RHEL 7 4.2.6p5-29.el7
  • sntp RHEL 7 4.2.6p5-29.el7
  • ntpdate RHEL 7 4.2.6p5-29.el7
  • ntp-perl RHEL 7 4.2.6p5-29.el7
  • ntp RHEL 6 4.2.6p5-15.el6_10
  • ntpdate RHEL 6 4.2.6p5-15.el6_10
  • ntp-perl RHEL 6 4.2.6p5-15.el6_10
  • ntp RHEL 7.6 EUS 4.2.6p5-28.el7_6.1

red hat advisories RHSA-2020:1470RHSA-2019:2077RHSA-2018:3854RHSA-2018:3853

  • ntp SLES 12 SP3, SLES 12 SP2-BCL, SLED 12 SP3 +7 more 4.2.8p12-64.8.2
  • ntp SLE Module for Legacy 15 4.2.8p12-4.3.2
  • ntp SLES 11 SP3-TERADATA, SLES 11 SP3-LTSS, SLE Point of Sale 11 SP3 4.2.8p12-48.21.1
  • ntp SLES for SAP 11 SP4, SLES 11 SP4 4.2.8p12-64.7.1
  • ntp SLES 12-LTSS 4.2.8p12-46.29.2

suse advisories SUSE-SU-2018:3342-2SUSE-SU-2018:3386-1SUSE-SU-2018:3356-1SUSE-SU-2018:3352-1SUSE-SU-2018:3342-1SUSE-SU-2018:3351-1

  • ntp openSUSE Tumbleweed 4.2.8p15-7.2

opensuse advisories openSUSE-SU-2024:11102-1

  • ntp Arch Linux 4.2.8.p12-1

arch linux advisories AVG-723

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-2018-12327 updated cvss 7.0

ntp: Stack-based buffer overflow in ntpq and ntpdc allows denial of service or code execution

  • Red Hat Enterprise Linux 5 ntp
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux Client (v. 7) ntp 4.2.6p5-29.el7, ntpdate 4.2.6p5-29.el7 Red Hat Enterprise Linux Client Optional (v. 7) sntp 4.2.6p5-29.el7, ntp-perl 4.2.6p5-29.el7 Red Hat Enterprise Linux ComputeNode (v. 7) ntp 4.2.6p5-29.el7, ntpdate 4.2.6p5-29.el7
    fixed: vendor fix RHSA-2019:2077
  • Red Hat Enterprise Linux ComputeNode EUS (v. 7.6) ntp 4.2.6p5-28.el7_6.1, ntpdate 4.2.6p5-28.el7_6.1
    fixed: vendor fix RHSA-2020:1470
  • Red Hat Enterprise Linux ComputeNode Optional (v. 7) sntp 4.2.6p5-29.el7, ntp-perl 4.2.6p5-29.el7
    fixed: vendor fix RHSA-2019:2077
  • Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.6) sntp 4.2.6p5-28.el7_6.1, ntp-perl 4.2.6p5-28.el7_6.1
    fixed: vendor fix RHSA-2020:1470
  • Red Hat Enterprise Linux Desktop (v. 6) ntp 4.2.6p5-15.el6_10, ntpdate 4.2.6p5-15.el6_10 Red Hat Enterprise Linux Desktop Optional (v. 6) ntp-perl 4.2.6p5-15.el6_10
    fixed: vendor fix RHSA-2018:3854
  • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) ntp 4.2.6p5-28.el7_6.1, ntpdate 4.2.6p5-28.el7_6.1 Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) sntp 4.2.6p5-28.el7_6.1, ntp-perl 4.2.6p5-28.el7_6.1
    fixed: vendor fix RHSA-2020:1470
  • Red Hat Enterprise Linux HPC Node (v. 6) ntp 4.2.6p5-15.el6_10, ntpdate 4.2.6p5-15.el6_10
    fixed: vendor fix RHSA-2018:3854
show 15 more
  • Red Hat Enterprise Linux HPC Node EUS (v. 6.7) ntp 4.2.6p5-5.el6_7.6, ntpdate 4.2.6p5-5.el6_7.6
    fixed: vendor fix RHSA-2018:3853
  • Red Hat Enterprise Linux HPC Node Optional (v. 6) ntp-perl 4.2.6p5-15.el6_10
    fixed: vendor fix RHSA-2018:3854
  • Red Hat Enterprise Linux HPC Node Optional EUS (v. 6.7) ntp-perl 4.2.6p5-5.el6_7.6
    fixed: vendor fix RHSA-2018:3853
  • Red Hat Enterprise Linux Server (v. 6) ntp 4.2.6p5-15.el6_10, ntpdate 4.2.6p5-15.el6_10
    fixed: vendor fix RHSA-2018:3854
  • Red Hat Enterprise Linux Server (v. 7) ntp 4.2.6p5-29.el7, ntpdate 4.2.6p5-29.el7
    fixed: vendor fix RHSA-2019:2077
  • Red Hat Enterprise Linux Server EUS (v. 6.7) ntp 4.2.6p5-5.el6_7.6, ntpdate 4.2.6p5-5.el6_7.6
    fixed: vendor fix RHSA-2018:3853
  • Red Hat Enterprise Linux Server EUS (v. 7.6) ntp 4.2.6p5-28.el7_6.1, ntpdate 4.2.6p5-28.el7_6.1
    fixed: vendor fix RHSA-2020:1470
  • Red Hat Enterprise Linux Server Optional (v. 6) ntp-perl 4.2.6p5-15.el6_10
    fixed: vendor fix RHSA-2018:3854
  • Red Hat Enterprise Linux Server Optional (v. 7) sntp 4.2.6p5-29.el7, ntp-perl 4.2.6p5-29.el7
    fixed: vendor fix RHSA-2019:2077
  • Red Hat Enterprise Linux Server Optional EUS (v. 6.7) ntp-perl 4.2.6p5-5.el6_7.6
    fixed: vendor fix RHSA-2018:3853
  • Red Hat Enterprise Linux Server Optional EUS (v. 7.6) sntp 4.2.6p5-28.el7_6.1, ntp-perl 4.2.6p5-28.el7_6.1
    fixed: vendor fix RHSA-2020:1470
  • Red Hat Enterprise Linux Workstation (v. 6) ntp 4.2.6p5-15.el6_10, ntpdate 4.2.6p5-15.el6_10
    fixed: vendor fix RHSA-2018:3854
  • Red Hat Enterprise Linux Workstation (v. 7) ntp 4.2.6p5-29.el7, ntpdate 4.2.6p5-29.el7
    fixed: vendor fix RHSA-2019:2077
  • Red Hat Enterprise Linux Workstation Optional (v. 6) ntp-perl 4.2.6p5-15.el6_10
    fixed: vendor fix RHSA-2018:3854
  • Red Hat Enterprise Linux Workstation Optional (v. 7) sntp 4.2.6p5-29.el7, ntp-perl 4.2.6p5-29.el7
    fixed: vendor fix RHSA-2019:2077

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

Timeline

  1. First public exploit (EDB-44909)
  2. Published

Exploit prediction

27.51% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-44909 ntp 4.2.8p11 - Local Buffer Overflow (PoC) dos, 2018-06-20
  • gist.github.com https://gist.github.com/fakhrizulkifli/9b58ed8e0354e8deee50b0eebd1c011f referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness

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.