Skip to content
Fencer Intel
medium 5.3

CVE-2015-8138 json

NTP before 4.2.8p6 and 4.3.x before 4.3.90 allows remote attackers to bypass the origin timestamp validation via a packet with an origin ti…

published 9y ago modified 4mo ago also EUVD-2015-8028

cvss
5.3
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
6.3%
EPSS 6.3% chance of exploitation in 30 days, percentile 93%
public exploits
0
none known

Summary

NTP before 4.2.8p6 and 4.3.x before 4.3.90 allows remote attackers to bypass the origin timestamp validation via a packet with an origin timestamp set to zero.

Patch / fix

  • ntp Debian 11 1:4.2.8p7+dfsg-1

debian advisories DEBIAN-CVE-2015-8138

  • ntp Ubuntu 14.04 LTS 1:4.2.6.p5+dfsg-3ubuntu2.14.04.10
  • ntp Ubuntu 16.04 LTS 1:4.2.8p4+dfsg-3ubuntu5.3

ubuntu advisories UBUNTU-CVE-2015-8138

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 6 4.2.6p5-5.el6_7.4
  • ntp RHEL 7 4.2.6p5-22.el7_2.1
  • sntp RHEL 7 4.2.6p5-22.el7_2.1
  • ntpdate RHEL 6 4.2.6p5-5.el6_7.4
  • ntpdate RHEL 7 4.2.6p5-22.el7_2.1
  • ntp-perl RHEL 6 4.2.6p5-5.el6_7.4
  • ntp-perl RHEL 7 4.2.6p5-22.el7_2.1

red hat advisories RHSA-2016:0063

  • ntp SLES 11 SP3-TERADATA, SLES 11 SP3-LTSS, SLES 11 SP2-LTSS +3 more 4.2.8p6-41.1
  • ntp SLES for SAP 12, SLES 12, SLED 12 4.2.8p6-46.5.2
  • yast2-ntp-client SLES for SAP 12, SLES 12, SLED 12 +1 more 3.1.12.4-8.2
  • ntp SLES 12 SP1, SLES 11 SP4, SLED 12 SP1 +2 more 4.2.8p6-8.2
  • yast2-ntp-client SLES for SAP 12 SP1, SLES 12 SP1, SLED 12 SP1 +1 more 3.1.22-6.2
  • yast2-ntp-client SLES 11 SP2-LTSS 2.17.14.1-1.12.1

suse advisories SUSE-SU-2016:1311-1SUSE-SU-2016:1247-1SUSE-SU-2016:1175-1SUSE-SU-2016:1177-1

  • ntp openSUSE Tumbleweed 4.2.8p9-1.1

opensuse advisories openSUSE-SU-2024:10181-1

Is CVE-2015-8138 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.

Check with Fencer

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-2015-8138 updated cvss 6.4

ntp: missing check for zero originate timestamp

  • Red Hat Enterprise Linux Client (v. 7) ntp 4.2.6p5-22.el7_2.1, ntpdate 4.2.6p5-22.el7_2.1 Red Hat Enterprise Linux Client Optional (v. 7) sntp 4.2.6p5-22.el7_2.1, ntp-perl 4.2.6p5-22.el7_2.1 Red Hat Enterprise Linux ComputeNode (v. 7) ntp 4.2.6p5-22.el7_2.1, ntpdate 4.2.6p5-22.el7_2.1 Red Hat Enterprise Linux ComputeNode Optional (v. 7) sntp 4.2.6p5-22.el7_2.1, ntp-perl 4.2.6p5-22.el7_2.1 Red Hat Enterprise Linux Desktop (v. 6) ntp 4.2.6p5-5.el6_7.4, ntpdate 4.2.6p5-5.el6_7.4 Red Hat Enterprise Linux Desktop Optional (v. 6) ntp-perl 4.2.6p5-5.el6_7.4
    +10 more products
    Red Hat Enterprise Linux HPC Node (v. 6) ntp 4.2.6p5-5.el6_7.4, ntpdate 4.2.6p5-5.el6_7.4 Red Hat Enterprise Linux HPC Node Optional (v. 6) ntp-perl 4.2.6p5-5.el6_7.4 Red Hat Enterprise Linux Server (v. 6) ntp 4.2.6p5-5.el6_7.4, ntpdate 4.2.6p5-5.el6_7.4 Red Hat Enterprise Linux Server (v. 7) ntp 4.2.6p5-22.el7_2.1, ntpdate 4.2.6p5-22.el7_2.1 Red Hat Enterprise Linux Server Optional (v. 6) ntp-perl 4.2.6p5-5.el6_7.4 Red Hat Enterprise Linux Server Optional (v. 7) sntp 4.2.6p5-22.el7_2.1, ntp-perl 4.2.6p5-22.el7_2.1 Red Hat Enterprise Linux Workstation (v. 6) ntp 4.2.6p5-5.el6_7.4, ntpdate 4.2.6p5-5.el6_7.4 Red Hat Enterprise Linux Workstation (v. 7) ntp 4.2.6p5-22.el7_2.1, ntpdate 4.2.6p5-22.el7_2.1 Red Hat Enterprise Linux Workstation Optional (v. 6) ntp-perl 4.2.6p5-5.el6_7.4 Red Hat Enterprise Linux Workstation Optional (v. 7) sntp 4.2.6p5-22.el7_2.1, ntp-perl 4.2.6p5-22.el7_2.1
    fixed: vendor fix RHSA-2016:0063
  • 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

cisa ICSA-21-103-11 updated cvss 5.3

Siemens TIM 4R-IE Devices

  • Siemens SIPLUS NET TIM 4R-IE (6AG1800-4BA00-7AA0) Siemens SIPLUS NET TIM 4R-IE DNP3 (6AG1803-4BA00-7AA0) Siemens TIM 4R-IE (6NH7800-4BA00) Siemens TIM 4R-IE DNP3 (6NH7803-4BA00-0AA0)
    affected: workaround, 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

cisa ICSA-21-159-11 updated cvss 5.3

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

6.26% chance of exploitation in the next 30 days, higher than 93% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 5.3 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:P/A:N

Classification

Weakness
  • CWE-20 Improper Input Validation

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.