{"id":"CVE-2020-36327","url":"https://www.cyber-defence.io/tools/cve/CVE-2020-36327","generatedAt":"2026-10-28T04:17:47.405Z","title":"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…","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.","published":"2021-04-29T03:15:09.000Z","lastModified":"2026-10-08T21:17:30.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.1","score":8.8,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"},"cwe":[],"affected":["bundler/bundler","fedoraproject/fedora","microsoft/package manager configurations"],"epss":{"score":0.06307,"percentile":0.9357,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (6.31%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://bundler.io/blog/2021/02/15/a-more-secure-bundler-we-fixed-our-source-priorities.html","tags":["Vendor Advisory"],"source":"cve@mitre.org"},{"url":"https://github.com/rubygems/rubygems/issues/3982","tags":["Exploit","Issue Tracking","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MWXHK5UUHVSHF7HTHMX6JY3WXDVNIHSL/","source":"cve@mitre.org"},{"url":"https://mensfeld.pl/2021/02/rubygems-dependency-confusion-attack-side-of-things/","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-24105","tags":["Patch","Vendor Advisory"],"source":"cve@mitre.org"},{"url":"https://www.zofrex.com/blog/2021/04/29/bundler-still-vulnerable-dependency-confusion-cve-2020-36327/","tags":["Exploit","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://bundler.io/blog/2021/02/15/a-more-secure-bundler-we-fixed-our-source-priorities.html","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/rubygems/rubygems/issues/3982","tags":["Exploit","Issue Tracking","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MWXHK5UUHVSHF7HTHMX6JY3WXDVNIHSL/","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://mensfeld.pl/2021/02/rubygems-dependency-confusion-attack-side-of-things/","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-24105","tags":["Patch","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.zofrex.com/blog/2021/04/29/bundler-still-vulnerable-dependency-confusion-cve-2020-36327/","tags":["Exploit","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2020-36327","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}