CVE-2021-27023

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 1.4% (70th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.4%CVSS: 9.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A flaw was discovered in Puppet Agent and Puppet Server that may result in a leak of HTTP credentials when following HTTP redirects to a different host. This is similar to CVE-2018-1000007

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
49
EG Risk 49/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation1% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track* or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
1.4%
EPSS %ILE
71st
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact total (CVSS ≥ 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

November 18, 2021

Last Modified

November 21, 2024

Advisory Details (1)

Auto-updated Oct 4, 2026
Patch available.
generic

[SECURITY] Fedora 35 Update: puppet-7.12.1-1.fc35 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/62SELE7EKVKZL4GABFMVYMIIUZ7FPEF7/

Vendor Advisories for CVE-2021-27023(4)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(2)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatpuppet-agent-0:6.26.0-1.el8sat2022-06-01redhat
redhatpuppetserver-0:6.18.0-1.el7sat2022-05-04redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(2 across 2 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
puppet5.5.22-2 ... 6.16.0-1 (6 versions)
  • every version on: no fix on record
—
RubyGems(1)
PackageVulnerable rangeFix by version rangeDependents
puppet0.13.0 ... 6.9.0 (244 versions)
  • 7.0.0 up to 7.12.1: fixed in 7.12.1
  • every version up to 6.25.1: fixed in 6.25.1
—

Data Freshness Timeline

(refreshed 8× in last 7d / 33× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 187 total refreshes for this CVE.

  1. 2026-10-09 20:04 UTCEPSS rescore
  2. 2026-10-08 16:39 UTCEPSS rescore
  3. 2026-10-07 23:44 UTCEPSS rescore
  4. 2026-10-06 15:14 UTCEPSS rescore
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  9. 2026-10-02 16:22 UTCEPSS rescore
  10. 2026-10-01 19:46 UTCEPSS rescore
  11. 2026-09-30 15:33 UTCEG score recompute
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  18. 2026-09-26 00:21 UTCEPSS rescore
  19. 2026-09-25 12:15 UTCOSV refresh
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  24. 2026-09-18 19:23 UTCEPSS rescore
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  1. 2026-09-17 19:23 UTCEPSS rescore
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  10. 2026-09-07 15:58 UTCEPSS rescore
  11. 2026-09-06 13:44 UTCEPSS rescore
  12. 2026-09-06 03:00 UTCOSV refresh
  13. 2026-09-05 15:25 UTCEPSS rescore
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  22. 2026-08-28 21:37 UTCEPSS rescore
  23. 2026-08-27 14:22 UTCEPSS rescore
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  27. 2026-08-23 00:16 UTCEPSS rescore
  28. 2026-08-21 23:46 UTCEPSS rescore
  29. 2026-08-20 22:52 UTCEPSS rescore
  30. 2026-08-19 17:01 UTCEPSS rescore
  31. 2026-08-19 14:02 UTCOSV refresh
  32. 2026-08-18 13:45 UTCEPSS rescore
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  38. 2026-08-13 21:57 UTCEPSS rescore
  39. 2026-08-12 13:47 UTCEPSS rescore
  40. 2026-08-11 13:38 UTCEPSS rescore
  41. 2026-08-09 13:43 UTCEPSS rescore
  42. 2026-08-08 16:33 UTCEPSS rescore
  43. 2026-08-07 16:23 UTCEPSS rescore
  44. 2026-08-06 13:43 UTCEPSS rescore
  45. 2026-08-05 19:14 UTCEPSS rescore
  46. 2026-08-04 15:06 UTCEPSS rescore
  47. 2026-08-04 10:34 UTCEPSS rescore
  48. 2026-08-04 09:57 UTCOSV refresh
  49. 2026-08-03 10:33 UTCEPSS rescore
  50. 2026-08-02 02:24 UTCEPSS rescore
  51. 2026-08-01 04:13 UTCEPSS rescore
  52. 2026-07-30 16:25 UTCEPSS rescore
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  54. 2026-07-30 01:28 UTCEPSS rescore
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  56. 2026-07-28 15:33 UTCEPSS rescore
  57. 2026-07-26 14:52 UTCEPSS rescore
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  59. 2026-07-25 14:15 UTCEPSS rescore
  60. 2026-07-24 14:15 UTCEPSS rescore
  61. 2026-07-23 14:16 UTCEPSS rescore
  62. 2026-07-23 01:59 UTCEG score recompute
  63. 2026-07-22 22:45 UTCEG score recompute
  64. 2026-07-22 14:06 UTCEPSS rescore
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  66. 2026-07-21 15:22 UTCEPSS rescore
  67. 2026-07-21 15:22 UTCEPSS rescore
  68. 2026-07-20 17:05 UTCEPSS rescore
  69. 2026-07-19 02:27 UTCEPSS rescore
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  71. 2026-07-18 10:02 UTCEPSS rescore
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  73. 2026-07-18 07:29 UTCOSV refresh
  74. 2026-07-16 17:00 UTCEPSS rescore
  75. 2026-07-15 16:55 UTCEPSS rescore

Related CVEs(same product + same vendor)

Same vendor

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redhat:RHSA-2022:1708

Frequently asked(5)

What is CVE-2021-27023?
CVE-2021-27023 is a critical vulnerability published on November 18, 2021. A flaw was discovered in Puppet Agent and Puppet Server that may result in a leak of HTTP credentials when following HTTP redirects to a different host. This is similar to CVE-2018-1000007
When was CVE-2021-27023 disclosed?
CVE-2021-27023 was first published on November 18, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-27023 actively exploited?
CVE-2021-27023 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.4% probability of exploitation in the next 30 days (71st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2021-27023?
CVE-2021-27023 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2021-27023?
A fix for CVE-2021-27023 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2021-27023 are linked in the Vendor Advisories panel on this page.

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