Security readout for executives and security teams
Plain-English summary
CVE-2021-27018 is a certificate-validation flaw in Puppet Remediate before version 2.0. The issue is narrow: sources say it only affects clients configured to use Tenable.sc as the vulnerability data source. Business urgency depends on whether that specific integration exists in your environment.
Executive priority
Handle as a targeted product hygiene item, not a confirmed active incident. If Puppet Remediate and Tenable.sc are in use together, prioritize upgrade verification because certificate-validation flaws can undermine trust in security tooling data paths.
Technical view
Puppet disclosed that Remediate did not properly validate certificates signed by an internal certificate authority in the Tenable.sc data-source path. The affected product is Puppet Remediate prior to 2.0, and the issue is listed as resolved in 2.0. No CVSS, CWE, or detailed attack path is provided in the bundle.
Likely exposure
Exposure appears limited to organizations running Puppet Remediate before 2.0 and configured to use Tenable.sc as the vulnerability data source. Environments without that product, version range, or integration are not identified as affected by the provided sources.
Exploitation context
The source bundle does not cite active exploitation, public exploit availability, or CISA KEV listing. Treat exploitation status as unconfirmed. The relevant risk is improper certificate validation in a trusted vulnerability-data integration, but the sources do not describe prerequisites or impact depth.
Researcher notes
The evidence is sparse: affected product, affected configuration, and fixed version are available, but severity scoring, CWE mapping, exploitation evidence, and detailed impact are absent. Avoid assuming broader Puppet product exposure or internet-facing exploitability without vendor confirmation.
Mitigation direction
- Upgrade Puppet Remediate to version 2.0 or later.
- Prioritize Remediate deployments using Tenable.sc as a data source.
- Review Puppet's advisory for any environment-specific guidance.
- Document whether the Tenable.sc integration exists in production.
Validation and detection
- Inventory Puppet Remediate deployments and record installed versions.
- Confirm whether each deployment uses Tenable.sc as its vulnerability data source.
- Verify affected deployments are upgraded to Remediate 2.0 or later.
- Review relevant certificate and data-source configuration for unexpected changes.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2021-27018 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://puppet.com/security/cve/CVE-2021-27018CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.