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Fencer Vulns
high 8.8

CVE-2018-16877 json

A flaw was found in the way pacemaker's client-server authentication was implemented in versions up to and including 2.0.0.

published 2019-04-18 7 y ago modified 2026-06-17 4 mo ago also EUVD-2018-8667

cvss
8.8
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 32%
public exploits
0
none known

Summary

A flaw was found in the way pacemaker's client-server authentication was implemented in versions up to and including 2.0.0. A local attacker could use this flaw, and combine it with other IPC weaknesses, to achieve local privilege escalation.

Patch / fix

  • pacemaker Debian 14, Debian 13, Debian 12 2.0.1-3

debian advisories DEBIAN-CVE-2018-16877

  • pacemaker Ubuntu 16.04 LTS 1.1.14-2ubuntu1.6
  • pacemaker Ubuntu 18.04 LTS 1.1.18-0ubuntu1.1

ubuntu advisories UBUNTU-CVE-2018-16877

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

  • pacemaker RHEL 7 1.1.19-8.el7_6.5
  • pacemaker-cli RHEL 7 1.1.19-8.el7_6.5
  • pacemaker-cts RHEL 7 1.1.19-8.el7_6.5
  • pacemaker-libs RHEL 7 1.1.19-8.el7_6.5
  • pacemaker-remote RHEL 7 1.1.19-8.el7_6.5
  • pacemaker-cluster-libs RHEL 7 1.1.19-8.el7_6.5
  • pacemaker-nagios-plugins-metadata RHEL 7 1.1.19-8.el7_6.5
  • pacemaker RHEL 8 2.0.1-4.el8_0.3

red hat advisories RHSA-2019:1278RHSA-2019:1279

  • pacemaker SLE High Availability Extension 12 SP2 1.1.15-23.9.1
  • pacemaker SLE Software Development Kit 12 SP4, SLE High Availability Extension 12 SP4 1.1.19+20181105.ccd6b5b10-3.13.1
  • pacemaker SLE High Availability Extension 15 1.1.18+20180430.b12c320f5-3.9.4
  • pacemaker SLE Software Development Kit 12 SP3, SLE High Availability Extension 12 SP3 1.1.16-6.14.1
  • pacemaker SLE Software Development Kit 12 SP4, SLE High Availability Extension 12 SP4 1.1.19+20181105.ccd6b5b10-3.10.1

suse advisories SUSE-SU-2020:1072-1SUSE-SU-2019:2268-1SUSE-SU-2019:1209-1SUSE-SU-2019:1108-1SUSE-SU-2019:1047-1

  • pacemaker openSUSE Leap 15.0 1.1.18+20180430.b12c320f5-lp150.2.9.1

opensuse advisories openSUSE-SU-2019:1400-1

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-2018-16877 updated cvss 8.8

pacemaker: Insufficient local IPC client-server authentication on the client's side can lead to local privesc

  • Red Hat Enterprise Linux 6 pacemaker, pacemaker-cli, pacemaker-cts, pacemaker-libs, pacemaker-remote, pacemaker-cluster-libs Red Hat Storage 3 pacemaker, pacemaker-cli, pacemaker-cts, pacemaker-libs, pacemaker-remote, pacemaker-cluster-libs
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux AppStream (v. 8) pacemaker 2.0.1-4.el8_0.3, pacemaker-libs 2.0.1-4.el8_0.3, pacemaker-schemas 2.0.1-4.el8_0.3, pacemaker-cluster-libs 2.0.1-4.el8_0.3 Red Hat Enterprise Linux High Availability (v. 8) pacemaker 2.0.1-4.el8_0.3, pacemaker-cli 2.0.1-4.el8_0.3, pacemaker-cts 2.0.1-4.el8_0.3, pacemaker-remote 2.0.1-4.el8_0.3, pacemaker-nagios-plugins-metadata 2.0.1-4.el8_0.3 Red Hat Enterprise Linux Resilient Storage (v. 8) pacemaker 2.0.1-4.el8_0.3, pacemaker-cli 2.0.1-4.el8_0.3, pacemaker-cts 2.0.1-4.el8_0.3, pacemaker-remote 2.0.1-4.el8_0.3, pacemaker-nagios-plugins-metadata 2.0.1-4.el8_0.3
    fixed: vendor fix RHSA-2019:1279
  • Red Hat Enterprise Linux Server High Availability (v. 7) pacemaker 1.1.19-8.el7_6.5, pacemaker-cli 1.1.19-8.el7_6.5, pacemaker-cts 1.1.19-8.el7_6.5, pacemaker-libs 1.1.19-8.el7_6.5, pacemaker-remote 1.1.19-8.el7_6.5, pacemaker-cluster-libs 1.1.19-8.el7_6.5, +1 more Red Hat Enterprise Linux Server Resilient Storage (v. 7) pacemaker 1.1.19-8.el7_6.5, pacemaker-cli 1.1.19-8.el7_6.5, pacemaker-cts 1.1.19-8.el7_6.5, pacemaker-libs 1.1.19-8.el7_6.5, pacemaker-remote 1.1.19-8.el7_6.5, pacemaker-cluster-libs 1.1.19-8.el7_6.5, +1 more
    fixed: vendor fix RHSA-2019:1278

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

0.38% chance of exploitation in the next 30 days, higher than 32% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.0 8.8 CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 4.6 AV:L/AC:L/Au:N/C:P/I:P/A:P

Affected products

  • ClusterLabs pacemaker

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.