No exploitation reportedFix available

CVE-2021-27025

Q: Is CVE-2021-27025 actively exploited?

Active exploitation of CVE-2021-27025 has not been confirmed. Its EPSS score was 1.1% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2021-27025?

CVE-2021-27025 has a CVSS v3 base score of 6.5 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

No exploitation reported by the sources we read.

Published2021-11-18
Fixed in2021.4.0

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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'.

Timeline

dates in UTC

2021-11-1815:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-27025?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-27025?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV

Puppet

Branch	Affected	Fixed in	Source
2021.x	≥ 2021.0.0, < 2021.4.0	2021.4.0	NVD

Puppet puppet agent

Branch	Affected	Fixed in	Source
7.x	≥ 7.0.0, < 7.12.1	7.12.1	NVD · OSV
6.25	< 6.25.1	6.25.1	NVD · OSV
5.5	≥ 5.5.0, ≤ 5.5.22	no fix published	NVD

Fedoraproject fedora

Branch	Affected	Fixed in	Source
35.x	= 35	no fix published	NVD

1 more product in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Puppet to 2021.4.0

Advisories and patches

puppet.comVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.16.5read 2026-10-23
NVDCVSS 2.04read 2026-10-23
FIRST EPSSEPSS score1.1 %2026-10-23
OSVaffected packages—

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Published: 2021-11-18
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2021-27025?

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'.

Is CVE-2021-27025 actively exploited?

Active exploitation of CVE-2021-27025 has not been confirmed. Its EPSS score was 1.1% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

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

CVE-2021-27025 has a CVSS v3 base score of 6.5 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

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