CVE-2021-27018Network attack vector

Vulnerability data integrity loss via certificate misvalidation

Published Aug 30, 2021 · Updated Aug 3, 2024

Improper certificate validation in Puppet Remediate before 2.0 allows remote attackers to compromise imported vulnerability data integrity. The Tenable.sc data-source integration fails to properly validate certificates signed by an internal certificate authority. The affected path is present only when Tenable.sc is configured as the vulnerability data source.

CVSS severity7.5
High
EPSS probability0.54%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper certificate validation in Puppet Remediate before 2.0 allows remote attackers to compromise imported vulnerability data integrity. The Tenable.sc data-source integration fails to properly validate certificates signed by an internal certificate authority. The affected path is present only when Tenable.sc is configured as the vulnerability data source.

The record

CVE
CVE-2021-27018
Published
Aug 30, 2021
Updated
Aug 3, 2024
Vendor
Puppet
Product
Puppet Remediate
Classifications
CWE-295
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 30, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Affects Puppet Remediate prior to 2.0, resolved in 2.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Puppet · Puppet Remediateversion=Affects Puppet Remediate prior to 2.0, resolved in 2.0

Published CVSS scores

4.3NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-295Improper Certificate Validation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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