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.
CVE-2020-36327
“—” beside the score: it is equal to NVD's CVSS score.
Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2021-05-24. NVD baseline CVSS 8.8; sources differ by 0.0.
Also known asEUVD-2021-1063 (ENISA EUVD) · GHSA-fp4w-jxhp-m23p (GitHub Security Advisories)Source: ENISA EUVD
- High severity, but no confirmed exploitation yet
A fix is available — apply it.
- CVSS v3
- 8.8
- EG Score
- 8.8HIGHmedium confidence
- EG Risk
- 42EG Risk 42/100
EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.
How it’s computed (value × EchelonGraph’s weight)Severity88% × 45%Impact severity (EG Severity): CVSS 8.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation6.3% × 40%FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.Automatability0% × 15%CISA's SSVC Automatable value: no (Vulnrichment).SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.Action: A fix is available. Apply it within your standard update timelines. - EPSS PROB
- 6.3%
- EPSS %ILE
- 93rd
- KEV
- Not listed
What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)
The EG score (8.8): severity, escalated by confirmed exploitation. This CVE's 8.8 is its impact severity (EG Severity), not escalated.
- EG Severity
- 8.8 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
- EG Likelihood
- 6.3% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-31). FIRST's exploitation probability, not an EchelonGraph model.
- Confirmed exploitation
- None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
- EG Priority
- SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.
SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).
A fix is available. Apply it within your standard update timelines.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table
BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.
The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it
Published
April 29, 2021
Last Modified
October 8, 2026
Advisory Details (6)
Auto-updated Aug 19, 2026RubyGems dependency confusion attack side of things - Closer to Code
https://mensfeld.pl/2021/02/rubygems-dependency-confusion-attack-side-of-things/[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/Global vs block gem server source priority doesn't work as expected · Issue #3982 · ruby/rubygems · GitHub
https://github.com/rubygems/rubygems/issues/3982Redirecting…
https://bundler.io/blog/2021/02/15/a-more-secure-bundler-we-fixed-our-source-priorities.htmlBundler 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/Security Update Guide - Microsoft Security Response Center
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-24105Vendor 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.
- RHSA-2022:0708Red Hat Product SecurityHigh
Red Hat Security Advisory: rh-ruby26-ruby security, bug fix, and enhancement update
- RHSA-2022:0582Red Hat Product SecurityHigh
Red Hat Security Advisory: ruby:2.6 security update
- RHSA-2022:0581Red Hat Product SecurityHigh
Red Hat Security Advisory: ruby:2.6 security update
- RHSA-2022:0546Red Hat Product SecurityHigh
Red Hat Security Advisory: ruby:2.5 security update
- RHSA-2022:0545Red Hat Product SecurityHigh
Red Hat Security Advisory: ruby:2.5 security update
- RHSA-2022:0544Red Hat Product SecurityHigh
Red Hat Security Advisory: ruby:2.6 security update
- RHSA-2022:0543Red Hat Product SecurityHigh
Red Hat Security Advisory: ruby:2.6 security update
- RHSA-2022:0547Red Hat Product SecurityHigh
Red Hat Security Advisory: ruby:2.5 security update
- +4 more
Patch Availability(14)
| Vendor / Ecosystem | Fix (by version range) / Patch | Released | Source |
|---|---|---|---|
| redhat | rh-ruby26-ruby-0:2.6.9-120.el7 | 2022-02-28 | redhat |
| redhat | ruby:2.6-8010020220201152941.c27ad7f8 | 2022-02-21 | redhat |
| redhat | ruby:2.6-8020020220201131207.4cda2c84 | 2022-02-21 | redhat |
| redhat | ruby:2.5-8040020220201123518.522a0ee4 | 2022-02-16 | redhat |
| redhat | ruby:2.5-8020020220201125131.4cda2c84 | 2022-02-16 | redhat |
| redhat | ruby:2.5-8050020220112131355.c5368500 | 2022-02-16 | redhat |
| redhat | ruby:2.6-8040020220131135901.522a0ee4 | 2022-02-16 | redhat |
| redhat | ruby:2.6-8050020211215144356.c5368500 | 2022-02-16 | redhat |
| redhat | ruby:2.5-8010020220201125517.c27ad7f8 | 2022-02-16 | redhat |
| redhat | rh-ruby30-ruby-0:3.0.2-148.el7 | 2021-10-25 | redhat |
| redhat | rh-ruby27-ruby-0:2.7.4-130.el7 | 2021-09-20 | redhat |
| redhat | ruby:2.7-8040020210728141159.522a0ee4 | 2021-08-05 | redhat |
| rubygems | bundler @ 2.2.10 (fixes >= 1.16.0, < 2.2.10) | — | ghsa |
| rubygems | bundler @ 2.2.18 (fixes >= 2.2.11, < 2.2.18) | — | ghsa |
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)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| rubygems | 3.2.27-1 ... 4.0.15-2 (18 versions) |
| — |
Debian:12(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| rubygems | — |
| — |
Debian:13(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| rubygems | — |
| — |
Debian:14(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| rubygems | — |
| — |
RubyGems(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| bundler | 2.2.11 ... 2.2.17 (7 versions) |
| — |
Data Freshness Timeline
(refreshed 11× in last 7d / 41× in last 30d)
Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.
Showing the most recent 99 of 189 refreshes on record for this CVE.
A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 1 repeat row among the latest 100 is merged into the row it repeats. The 90 oldest rows on record are not shown and were not checked, so the counts can still include repeats.
- 2026-11-01 16:29 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-11-01 08:36 UTCGHSA enrichmentGHSA-fp4w-jxhp-m23p · GitHub severity HIGH · GitHub CVSS 8.8
- 2026-11-01 08:36 UTCEG score recompute
- 2026-10-31 16:28 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-10-30 16:29 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-10-29 16:28 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-10-29 05:37 UTCEG score recompute
- 2026-10-29 05:37 UTCVendor advisory
- 2026-10-28 16:28 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-10-27 16:28 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-10-26 16:27 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-10-25 18:43 UTCEG score recompute
- 2026-10-25 16:28 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-10-24 16:28 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-10-23 16:28 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-10-22 16:29 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-10-21 16:28 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-10-21 11:50 UTCEG score recompute
- 2026-10-21 11:50 UTCVendor advisory
- 2026-10-20 16:28 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-10-19 16:27 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-10-18 16:28 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-10-18 09:22 UTCEG score recompute
- 2026-10-17 16:28 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-10-16 16:33 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
Show 74 moreShow fewer
- 2026-10-15 16:27 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-10-14 16:28 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-10-13 16:28 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-10-12 19:35 UTCEG score recompute
- 2026-10-12 16:29 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-10-11 23:59 UTCEG score recompute
- 2026-10-11 13:43 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-10-10 19:56 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-10-09 20:04 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-10-08 21:24 UTCEG score recompute
- 2026-10-08 21:24 UTCVendor advisory
- 2026-10-08 16:38 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-10-07 23:44 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-10-06 15:13 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-10-05 17:39 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-10-04 23:18 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-10-03 14:22 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-09-30 15:19 UTCEG score recompute
- 2026-09-30 14:59 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-09-29 15:14 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-09-27 13:41 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-09-26 15:54 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-09-26 03:15 UTCOSV refresh
- 2026-09-24 14:00 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-09-22 14:43 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-09-21 20:28 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-09-20 20:11 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-09-19 15:37 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-09-18 19:23 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-09-17 19:22 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-09-16 14:04 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-09-15 03:06 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-09-13 16:43 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-09-12 14:57 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-09-11 09:32 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-09-08 21:56 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-09-07 15:57 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-09-06 18:13 UTCOSV refresh
- 2026-09-06 13:44 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-09-05 15:24 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-09-04 13:57 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-09-04 05:03 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-09-02 14:08 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-09-01 03:32 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-08-30 19:14 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-08-30 01:18 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-08-27 14:21 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-08-26 14:42 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-08-25 13:45 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-08-21 23:45 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-08-20 22:52 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-08-20 04:15 UTCOSV refresh
- 2026-08-19 17:00 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-08-18 13:44 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-08-17 13:43 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-08-16 14:52 UTCEPSS rescoreEPSS 6.3% · 93rd percentile
- 2026-08-16 02:11 UTCEPSS rescoreEPSS 6.3% · 92nd percentile
- 2026-08-15 01:26 UTCEPSS rescoreEPSS 6.3% · 92nd percentile
- 2026-08-13 21:57 UTCEPSS rescoreEPSS 6.3% · 92nd percentile
- 2026-08-12 13:47 UTCEPSS rescoreEPSS 6.3% · 92nd percentile
- 2026-08-09 13:43 UTCEPSS rescoreEPSS 6.3% · 92nd percentile
- 2026-08-08 16:33 UTCEPSS rescoreEPSS 6.3% · 92nd percentile
- 2026-08-07 16:23 UTCEPSS rescoreEPSS 6.3% · 92nd percentile
- 2026-08-06 13:43 UTCEPSS rescoreEPSS 6.3% · 92nd percentile
- 2026-08-04 23:11 UTCOSV refresh
- 2026-08-04 15:06 UTCEPSS rescoreEPSS 6.3% · 92nd percentile
- 2026-08-02 02:23 UTCEPSS rescoreEPSS 6.3% · 92nd percentile
- 2026-08-01 04:12 UTCEPSS rescoreEPSS 6.3% · 92nd percentile
- 2026-07-30 16:25 UTCEPSS rescoreEPSS 6.3% · 92nd percentile
- 2026-07-30 01:27 UTCEPSS rescoreEPSS 6.3% · 92nd percentile
- 2026-07-28 15:33 UTCEPSS rescoreEPSS 6.3% · 92nd percentile
- 2026-07-26 14:51 UTCEPSS rescoreEPSS 6.3% · 92nd percentile
- 2026-07-25 14:15 UTCEPSS rescoreEPSS 6.3% · 92nd percentile
- 2026-07-24 14:14 UTCEPSS rescoreEPSS 6.3% · 92nd percentile
Related CVEs(same product + same vendor)
Same product
10 shownRubyGems:bundler · Debian:11:rubygems
Same vendor
10 shownredhat:RHSA-2021:3020 · redhat:RHSA-2022:0543 · redhat:RHSA-2022:0581
Frequently asked(5)
What is CVE-2020-36327?
When was the CVE record for CVE-2020-36327 published?
Is CVE-2020-36327 actively exploited?
What is the CVSS score of CVE-2020-36327?
How do I remediate CVE-2020-36327?
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2020-36327
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