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CVE-2020-36327

HIGH
8.8
CVSS Score
Published: April 29, 2021 at 02:28 AM UTC
Updated: October 8, 2026 at 09:17 PM UTC
4 products affected across 4 vendorsFedoraBundlerPackage Manager Configurations

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Severity
HIGH8.8
Exploit prediction
EPSS 6%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Bundler· Bundlerrubygems
95%
1.16.0 ≤ v < 2.2.102.2.11 ≤ v ≤ 2.2.16*
Affected range stops below 2.2.10, so it looks safe — our inference, not a vendor statement
Fedora· Fedora Projectrpm
95%
34
Package Manager Configurations· Microsoft
95%
-
Bundler· Rubygemsrubygems
50%
All versions

References (6)

x_refsource_MISCVendor Advisory
Source: [email protected]
https://bundler.io/blog/2021/02/15/a-more-secure-bundler-we-fixed-our-source-priorities.html
x_refsource_MISCExploitIssue TrackingThird Party Advisory
Source: [email protected]
https://github.com/rubygems/rubygems/issues/3982
Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MWXHK5UUHVSHF7HTHMX6JY3WXDVNIHSL/
x_refsource_MISCThird Party Advisory
Source: [email protected]
https://mensfeld.pl/2021/02/rubygems-dependency-confusion-attack-side-of-things/
x_refsource_MISCPatchVendor Advisory
Source: [email protected]
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-24105
x_refsource_MISCExploitThird Party Advisory
Source: [email protected]
https://www.zofrex.com/blog/2021/04/29/bundler-still-vulnerable-dependency-confusion-cve-2020-36327/

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
NVD-CWE-noinfo

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