CVE-2021-39132

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.8 under NVD CVSS v3. EPSS exploit probability: 1.7% (76th 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
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.7%CVSS: 8.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Rundeck is an open source automation service with a web console, command line tools and a WebAPI. Prior to version 3.3.14 and version 3.4.3, an authorized user can upload a zip-format plugin with a crafted plugin.yaml, or a crafted aclpolicy yaml file, or upload an untrusted project archive with a crafted aclpolicy yaml file, that can cause the server to run untrusted code on Rundeck Community or Enterprise Edition. An authenticated user can make a POST request, that can cause the server to run untrusted code on Rundeck Enterprise Edition. The zip-format plugin issues requires authentication and authorization to these access levels, and affects all Rundeck editions:admin level access to the system resource type. The ACL Policy yaml file upload issues requires authentication and authorization to these access levels, and affects all Rundeck editions: create update or admin level access to a project_acl resource, and/orcreate update or admin level access to the system_acl resource. The unauthorized POST request requires authentication, but no specific authorization, and affects Rundeck Enterprise only. Patches are available in versions 3.4.3, 3.3.14

CVSS v3
8.8
EG Score
8.8HIGHmedium confidence
EG Risk
45
EG Risk 45/100CISA 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
Severity88% × 45%
Exploitation2% × 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
1.7%
EPSS %ILE
76th
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 partial (CVSS below 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

August 30, 2021

Last Modified

November 21, 2024

Advisory Details (2)

Auto-updated Aug 24, 2026
Patch available. Sources: github_commit, github.
githubMentions a patch (unverified)

YAML deserialization can run untrusted code · Advisory · rundeck/rundeck · GitHub

https://github.com/rundeck/rundeck/security/advisories/GHSA-q4rf-3fhx-88pf
github_commit Patch Available

commit 850d12e21d22 (rundeck/rundeck)

Patch available: rundeck/rundeck v5.1.1 (contains commit 850d12e21d22)

https://github.com/rundeck/rundeck/commit/850d12e21d22833bc148b7f458d7cb5949f829b6

Affected Packages

(1 across 1 ecosystem)
Maven(1)
PackageVulnerable rangeFix by version rangeDependents
org.rundeck:rundeck-core1.4.4 ... 3.3.9-rc4-20210201 (181 versions)
  • 3.4.0 up to 3.4.3: fixed in 3.4.3
  • every version up to 3.3.14: fixed in 3.3.14
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 34× 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 190 total refreshes for this CVE.

  1. 2026-10-10 19:56 UTCEPSS rescore
  2. 2026-10-09 20:04 UTCEPSS rescore
  3. 2026-10-08 16:39 UTCEPSS rescore
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  10. 2026-09-30 15:40 UTCEG score recompute
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  1. 2026-09-17 19:23 UTCEPSS rescore
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  14. 2026-09-06 09:00 UTCOSV refresh
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  21. 2026-08-30 19:14 UTCEPSS rescore
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  30. 2026-08-21 23:46 UTCEPSS rescore
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  32. 2026-08-19 19:34 UTCOSV refresh
  33. 2026-08-19 17:01 UTCEPSS rescore
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  40. 2026-08-13 21:57 UTCEPSS rescore
  41. 2026-08-12 13:48 UTCEPSS rescore
  42. 2026-08-11 13:38 UTCEPSS rescore
  43. 2026-08-09 13:44 UTCEPSS rescore
  44. 2026-08-08 16:33 UTCEPSS rescore
  45. 2026-08-07 16:24 UTCEPSS rescore
  46. 2026-08-06 13:43 UTCEPSS rescore
  47. 2026-08-05 19:14 UTCEPSS rescore
  48. 2026-08-04 15:06 UTCEPSS rescore
  49. 2026-08-04 15:02 UTCOSV refresh
  50. 2026-08-04 10:34 UTCEPSS rescore
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  63. 2026-07-23 14:16 UTCEPSS rescore
  64. 2026-07-23 02:03 UTCEG score recompute
  65. 2026-07-22 22:50 UTCEG score recompute
  66. 2026-07-22 14:06 UTCEPSS rescore
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  68. 2026-07-21 15:22 UTCEPSS rescore
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  70. 2026-07-20 17:05 UTCEPSS rescore
  71. 2026-07-19 14:29 UTCEPSS rescore
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  73. 2026-07-19 02:27 UTCEPSS rescore
  74. 2026-07-18 12:59 UTCOSV refresh
  75. 2026-07-18 10:02 UTCEPSS rescore

Related CVEs(same product + same CWE)

Same product

1 shown

Maven:org.rundeck:rundeck-core

Frequently asked(5)

What is CVE-2021-39132?
CVE-2021-39132 is a high vulnerability published on August 30, 2021. Rundeck is an open source automation service with a web console, command line tools and a WebAPI. Prior to version 3.3.14 and version 3.4.3, an authorized user can upload a zip-format plugin with a crafted plugin.yaml, or a crafted aclpolicy yaml file, or upload an untrusted project archive with a…
When was CVE-2021-39132 disclosed?
CVE-2021-39132 was first published on August 30, 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-2021-39132 actively exploited?
CVE-2021-39132 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.7% probability of exploitation in the next 30 days (76th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2021-39132?
CVE-2021-39132 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2021-39132?
A fix for CVE-2021-39132 is available: update to the fixed version the vendor names in its advisory.

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