CVE-2020-36327

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.8 under NVD CVSS v3. EPSS exploit probability: 6.3%, top 7% of all CVEs by exploit prediction. 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: 6%CVSS: 8.8Exploit: None knownExposed: 0

A fix is available — apply it.

Bundler 1.16.0 through 2.2.9 and 2.2.11 through 2.2.16 sometimes chooses a dependency source based on the highest gem version number, which means that a rogue gem found at a public source may be chosen, even if the intended choice was a private gem that is a dependency of another private gem that is explicitly depended on by the application. NOTE: it is not correct to use CVE-2021-24105 for every "Dependency Confusion" issue in every product.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
47(Track)
EG Risk 47/100SSVC: Track

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%
Exploitation6% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
6%
EPSS %ILE
93%
KEV
Not listed

Published

April 29, 2021

Last Modified

November 21, 2024

Advisory Details (6)

Auto-updated Aug 19, 2026
Patch available. Sources: microsoft.
generic

RubyGems dependency confusion attack side of things - Closer to Code

https://mensfeld.pl/2021/02/rubygems-dependency-confusion-attack-side-of-things/
generic

[SECURITY] Fedora 34 Update: ruby-3.0.2-149.fc34 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MWXHK5UUHVSHF7HTHMX6JY3WXDVNIHSL/
generic

Global vs block gem server source priority doesn't work as expected · Issue #3982 · ruby/rubygems · GitHub

https://github.com/rubygems/rubygems/issues/3982
generic

Redirecting…

https://bundler.io/blog/2021/02/15/a-more-secure-bundler-we-fixed-our-source-priorities.html
generic

Bundler is Still Vulnerable to Dependency Confusion Attacks (CVE⁠-⁠2020⁠-⁠36327) | zofrex.com

https://www.zofrex.com/blog/2021/04/29/bundler-still-vulnerable-dependency-confusion-cve-2020-36327/
microsoft Patch Available

Security Update Guide - Microsoft Security Response Center

Security Update Guide - Microsoft Security Response Center. Patch available via Microsoft Security Update

https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-24105

Vendor Advisories for CVE-2020-36327(12)

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

Patch Availability(12)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatrh-ruby26-ruby-0:2.6.9-120.el72022-02-28redhat
redhatruby:2.6-8020020220201131207.4cda2c842022-02-21redhat
redhatruby:2.6-8010020220201152941.c27ad7f82022-02-21redhat
redhatruby:2.5-8040020220201123518.522a0ee42022-02-16redhat
redhatruby:2.6-8050020211215144356.c53685002022-02-16redhat
redhatruby:2.5-8010020220201125517.c27ad7f82022-02-16redhat
redhatruby:2.5-8050020220112131355.c53685002022-02-16redhat
redhatruby:2.5-8020020220201125131.4cda2c842022-02-16redhat
redhatruby:2.6-8040020220131135901.522a0ee42022-02-16redhat
redhatrh-ruby30-ruby-0:3.0.2-148.el72021-10-25redhat
redhatrh-ruby27-ruby-0:2.7.4-130.el72021-09-20redhat
redhatruby:2.7-8040020210728141159.522a0ee42021-08-05redhat

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

(5 across 5 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
rubygems3.2.27-1 ... 4.0.15-2 (18 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
rubygems—3.3.5-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
rubygems—3.3.5-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
rubygems—3.3.5-1—
RubyGems(1)
PackageVulnerable rangeFixed inDependents
bundler2.2.11 ... 2.2.17 (7 versions)2.2.18—

Data Freshness Timeline

(refreshed 6× in last 7d / 23× 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 136 total refreshes for this CVE.

  1. 2026-09-18 19:23 UTCEPSS rescore
  2. 2026-09-17 19:22 UTCEPSS rescore
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  24. 2026-08-20 04:15 UTCOSV refresh
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  1. 2026-08-18 13:44 UTCEPSS rescore
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  24. 2026-07-23 01:53 UTCEG score recompute
  25. 2026-07-22 22:39 UTCEG score recompute
  26. 2026-07-22 14:05 UTCEPSS rescore
  27. 2026-07-21 15:22 UTCEPSS rescore
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  35. 2026-07-18 21:29 UTCOSV refresh
  36. 2026-07-16 16:59 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2020-36327?
CVE-2020-36327 is a high vulnerability published on April 29, 2021. Bundler 1.16.0 through 2.2.9 and 2.2.11 through 2.2.16 sometimes chooses a dependency source based on the highest gem version number, which means that a rogue gem found at a public source may be chosen, even if the intended choice was a private gem that is a dependency of another private gem that…
When was CVE-2020-36327 disclosed?
CVE-2020-36327 was first published in the National Vulnerability Database on April 29, 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-2020-36327 actively exploited?
CVE-2020-36327 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 6% probability of exploitation in the next 30 days, which ranks it in the top 6.7% of all scored CVEs.
What is the CVSS score of CVE-2020-36327?
CVE-2020-36327 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2020-36327?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-36327, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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