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Noroxi
NVD / CVE Program· CNA redhat

CVE-2020-25654: An ACL bypass flaw was found in pacemaker.

HighCVSS 7.2 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 29/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 1.8% (FIRST EPSS); higher than 79.5% of all records.
  • Anyone who can reach it over the internet can trigger it. Administrator privileges are required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: pacemaker (AlmaLinux:8) 2.0.4-6.el8_3.1; pacemaker-cli (AlmaLinux:8) 2.0.4-6.el8_3.1; pacemaker-cts (AlmaLinux:8) 2.0.4-6.el8_3.1.

Low priority for now. Upgrade to pacemaker (AlmaLinux:8) 2.0.4-6.el8_3.1; pacemaker-cli (AlmaLinux:8) 2.0.4-6.el8_3.1; pacemaker-cts (AlmaLinux:8) 2.0.4-6.el8_3.1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

An ACL bypass flaw was found in pacemaker. An attacker having a local account on the cluster and in the haclient group could use IPC communication with various daemons directly to perform certain tasks that they would be prevented by ACLs from doing if they went through the configuration.

Published
Nov 24, 2020
Updated
Jun 16, 2026
EPSS
1.8% · 79th percentile

Report tools

JSON

Action score

29

Monitor

Low priority for now.

CVSS
28 / 40 · 7.2 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 1.8%

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
clusterlabspacemaker
debiandebian linux

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • n/a pacemaker

    • pacemaker 1.1.24-rc1, pacemaker 2.0.5-rc2affected
Affected versions · NVD (4)

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • clusterlabs pacemakerbefore 1.1.23
  • clusterlabs pacemaker2.0.0 and later · before 2.0.3
  • clusterlabs pacemaker2.0.5
  • debian debian linux9.0

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:8pacemakerbefore 2.0.4-6.el8_3.12.0.4-6.el8_3.1
AlmaLinux:8pacemaker-clibefore 2.0.4-6.el8_3.12.0.4-6.el8_3.1
AlmaLinux:8pacemaker-ctsbefore 2.0.4-6.el8_3.12.0.4-6.el8_3.1
AlmaLinux:8pacemaker-docbefore 2.0.4-6.el8_3.12.0.4-6.el8_3.1
AlmaLinux:8pacemaker-libs-develbefore 2.0.4-6.el8_3.12.0.4-6.el8_3.1
AlmaLinux:8pacemaker-nagios-plugins-metadatabefore 2.0.4-6.el8_3.12.0.4-6.el8_3.1
AlmaLinux:8pacemaker-remotebefore 2.0.4-6.el8_3.12.0.4-6.el8_3.1
Debian:10pacemakerbefore 2.0.1-5+deb10u12.0.1-5+deb10u1
Debian:12pacemakerbefore 2.0.5~rc2-12.0.5~rc2-1
Debian:9pacemakerbefore 1.1.24-0+deb9u11.1.24-0+deb9u1
openSUSE:Leap 15.1pacemakerbefore 2.0.1+20190417.13d370ca9-lp151.2.16.42.0.1+20190417.13d370ca9-lp151.2.16.4
openSUSE:Leap 15.2pacemakerbefore 2.0.4+20200616.2deceaa3a-lp152.2.3.12.0.4+20200616.2deceaa3a-lp152.2.3.1
Red Hat:enterprise_linux:7::serverpacemakerbefore 0:1.1.23-1.el7_9.10:1.1.23-1.el7_9.1
Red Hat:enterprise_linux:7::serverpacemaker-clibefore 0:1.1.23-1.el7_9.10:1.1.23-1.el7_9.1
Red Hat:enterprise_linux:7::serverpacemaker-cluster-libsbefore 0:1.1.23-1.el7_9.10:1.1.23-1.el7_9.1
Red Hat:enterprise_linux:7::serverpacemaker-ctsbefore 0:1.1.23-1.el7_9.10:1.1.23-1.el7_9.1
Red Hat:enterprise_linux:7::serverpacemaker-debuginfobefore 0:1.1.23-1.el7_9.10:1.1.23-1.el7_9.1
Red Hat:enterprise_linux:7::serverpacemaker-docbefore 0:1.1.23-1.el7_9.10:1.1.23-1.el7_9.1
Red Hat:enterprise_linux:7::serverpacemaker-libsbefore 0:1.1.23-1.el7_9.10:1.1.23-1.el7_9.1
Red Hat:enterprise_linux:7::serverpacemaker-libs-develbefore 0:1.1.23-1.el7_9.10:1.1.23-1.el7_9.1
Red Hat:enterprise_linux:7::serverpacemaker-nagios-plugins-metadatabefore 0:1.1.23-1.el7_9.10:1.1.23-1.el7_9.1
Red Hat:enterprise_linux:7::serverpacemaker-remotebefore 0:1.1.23-1.el7_9.10:1.1.23-1.el7_9.1
Red Hat:enterprise_linux:8::appstreampacemakerbefore 0:2.0.4-6.el8_3.10:2.0.4-6.el8_3.1
Red Hat:enterprise_linux:8::appstreampacemaker-cli-debuginfobefore 0:2.0.4-6.el8_3.10:2.0.4-6.el8_3.1

+36

Same product

clusterlabs: all records

Other highest-scoring records for the same primary product.

  • CVE-2019-3885A use-after-free flaw was found in pacemaker up to and including version 2.0.1 which could result in certain sensitive information to be…
    31Monitor
  • CVE-2018-16877A flaw was found in the way pacemaker's client-server authentication was implemented in versions up to and including 2.0.0.
    31Monitor
  • CVE-2016-7035An authorization flaw was found in Pacemaker before 1.1.16, where it did not properly guard its IPC interface.
    31Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2016-7797Mar 24, 2017 · Pacemaker before 1.1.15, when using pacemaker remote, might allow remote attackers to cause a denial of service (node disconnection) via an…
    31Monitor
  • ← EarlierCVE-2018-16878Apr 18, 2019 · A flaw was found in pacemaker up to and including version 2.0.1.
    22Monitor
  • ← EarlierCVE-2011-5271Nov 12, 2019 · Pacemaker before 1.1.6 configure script creates temporary files insecurely
    22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
almalinux:pacemaker2.0.4-6.el8_3.1 · AlmaLinux:8Package registry (OSV)
almalinux:pacemaker-cli2.0.4-6.el8_3.1 · AlmaLinux:8Package registry (OSV)
almalinux:pacemaker-cts2.0.4-6.el8_3.1 · AlmaLinux:8Package registry (OSV)
almalinux:pacemaker-doc2.0.4-6.el8_3.1 · AlmaLinux:8Package registry (OSV)
almalinux:pacemaker-libs-devel2.0.4-6.el8_3.1 · AlmaLinux:8Package registry (OSV)
almalinux:pacemaker-nagios-plugins-metadata2.0.4-6.el8_3.1 · AlmaLinux:8Package registry (OSV)
almalinux:pacemaker-remote2.0.4-6.el8_3.1 · AlmaLinux:8Package registry (OSV)
debian:pacemaker2.0.5~rc2-1 · Debian:12Package registry (OSV)
opensuse:pacemaker2.0.4+20200616.2deceaa3a-lp152.2.3.1 · openSUSE:Leap 15.2Package registry (OSV)
red hat:pacemaker0:2.0.3-5.el8_2.3 · Red Hat:rhel_eus:8.2::appstreamPackage registry (OSV)
red hat:pacemaker-cli0:2.0.3-5.el8_2.3 · Red Hat:rhel_eus:8.2::highavailabilityPackage registry (OSV)
red hat:pacemaker-cli-debuginfo0:2.0.3-5.el8_2.3 · Red Hat:rhel_eus:8.2::appstreamPackage registry (OSV)
red hat:pacemaker-cluster-libs0:2.0.3-5.el8_2.3 · Red Hat:rhel_eus:8.2::appstreamPackage registry (OSV)
red hat:pacemaker-cluster-libs-debuginfo0:2.0.3-5.el8_2.3 · Red Hat:rhel_eus:8.2::appstreamPackage registry (OSV)
red hat:pacemaker-cts0:2.0.3-5.el8_2.3 · Red Hat:rhel_eus:8.2::highavailabilityPackage registry (OSV)
red hat:pacemaker-debuginfo0:2.0.3-5.el8_2.3 · Red Hat:rhel_eus:8.2::appstreamPackage registry (OSV)
red hat:pacemaker-debugsource0:2.0.3-5.el8_2.3 · Red Hat:rhel_eus:8.2::appstreamPackage registry (OSV)
red hat:pacemaker-libs0:2.0.3-5.el8_2.3 · Red Hat:rhel_eus:8.2::appstreamPackage registry (OSV)
red hat:pacemaker-libs-debuginfo0:2.0.3-5.el8_2.3 · Red Hat:rhel_eus:8.2::appstreamPackage registry (OSV)
red hat:pacemaker-remote-debuginfo0:2.0.3-5.el8_2.3 · Red Hat:rhel_eus:8.2::appstreamPackage registry (OSV)
red hat:pacemaker-schemas0:2.0.3-5.el8_2.3 · Red Hat:rhel_eus:8.2::appstreamPackage registry (OSV)
suse:pacemaker2.0.4+20200616.2deceaa3a-3.3.1 · SUSE:Linux Enterprise High Availability Extension 15 SP2Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • Administrator privileges are required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
High
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-284 · Improper Access Control

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

References

Show all references (4 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records