How severe is CVE-2021-27025?

CVE-2021-27025 has a CVSS score of 6.5/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2021-27025?

CVE-2021-27025 affects the following packages: puppet (RubyGems), puppet (RubyGems). Ecosystems affected: RubyGems.

How do I fix CVE-2021-27025?

Update puppet to 7.12.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-27025 is resolved across your whole dependency graph.

How do I detect CVE-2021-27025 in my RubyGems dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for puppet, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2021-27025 if there is no patch (or I can't update yet)?

Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Is CVE-2021-27025 actively exploited in the wild?

No public exploit code has been indexed for CVE-2021-27025 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2021-27025?

CVE-2021-27025 has an EPSS (Exploit Prediction Scoring System) score of 1.1%, placing it in the 65th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

When was CVE-2021-27025 published, and has it been updated?

CVE-2021-27025 was published on November 18, 2021 and was last updated on July 8, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

💎

💎 RubyGems

Not in CISA KEV

MEDIUM severity

CVE-2021-27025 — puppet

MEDIUM

CVE-2021-27025 is a medium-severity (CVSS 6.5) vulnerability in puppet. A fix is available for puppet — see the affected versions and patch details below.

Silent Configuration Failure in Puppet Agent

Also known asGHSA-q4g7-jrxv-67r9

Published

Nov 18, 2021

Updated

Jul 8, 2026

Affected

2 pkgs

Patched

2 / 2

Exploits

None indexed

Exploitation data as of Oct 9, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

1.1%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs65th percentile — riskier than 65% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2021-27025 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,738 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

2 pkgs affected

💎puppet💎puppet

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects RubyGems packages — download data is not available via public APIs for these ecosystems.

Description

A flaw was discovered in Puppet Agent where the agent may silently ignore Augeas settings or may be vulnerable to a Denial of Service condition prior to the first 'pluginsync'.

Affected Packages

2 total 2 fixed

Ecosystem	Package	Vulnerable range	Fix
💎RubyGems	`puppet`	≥ 7.0.0&&< 7.12.1	7.12.1`bundle update puppet --conservative`
💎RubyGems	`puppet`	all versions	6.25.1`bundle update puppet --conservative`

Affected Products

4 products · 6 configurations

fedorafedoraproject

1 version

Application

puppetpuppet

≥ 2021.0.0 && < 2021.4.0

range

Application

puppet agentpuppet

≥ 7.0.0 && ≤ 5.5.22

range

Application

puppet enterprisepuppet

< 2019.8.9

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for puppet, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update puppet to 7.12.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-27025 is resolved across your whole dependency graph.
Workarounds
Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatModerate

Workaround published by Red Hat

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

Source: Red Hat security advisory for CVE-2021-27025 (CC BY 4.0)

Product	Fixed in	Advisory
Red Hat OpenStack Platform 16.1	`puppet-0:5.5.10-14.el8ost`	RHSA-2022:8862
Red Hat OpenStack Platform 16.2	`puppet-0:5.5.10-14.el8ost`	RHSA-2022:8846
Red Hat Satellite 6.10 for RHEL 7	`puppet-agent-0:6.26.0-1.el7sat`	RHSA-2022:1708
Satellite Tools 6.10 for RHEL 6.ELS	`puppet-agent-0:6.26.0-1.el6sat`	RHSA-2022:4866
Satellite Tools 6.9 for RHEL 6.ELS	`puppet-agent-0:6.26.0-1.el6sat`	RHSA-2022:4867

Frequently Asked Questions

A flaw was discovered in Puppet Agent where the agent may silently ignore Augeas settings or may be vulnerable to a Denial of Service condition prior to the first 'pluginsync'.

O3 Security · Impact-Aware SCA

Is CVE-2021-27025 in your dependencies?

Find it across RubyGems, including transitive dependencies.

Scan my dependencies How O3 SCA works

CVSS Score

6.5/10CVSS v3 base

Vector breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Raw vector

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

Weaponization

No known public exploit tooling found.

Timeline

Disclosed

Nov 18, 2021

Last updated

Jul 8, 2026

Identifiers

CVE-2021-27025

GHSA-q4g7-jrxv-67r9

References

Advisorypuppet.com Advisorynvd.nist.gov Weblists.fedoraproject.org Webgithub.com Weblists.fedoraproject.org Packagegithub.com

Related vulnerabilities

This CVE is medium severity; 7 of 8 other CVEs affecting puppet are rated as high or higher (top: moderate).

CVE-2012-1988CVE-2012-1053CVE-2011-3869CVE-2011-0528CVE-2012-1906CVE-2011-3871CVE-2011-3870CVE-2012-1987

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedJul 8, 2026

CVE-2021-27025 — puppet

EPSS Exploitation Probability

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

Description

Affected Packages

Affected Products

Detection & mitigation playbook

Detect

Fix

Workarounds

Fixing This On Your OS

Frequently Asked Questions

Is CVE-2021-27025 in your dependencies?