{"id":"CVE-2021-23421","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-23421","generatedAt":"2026-10-27T22:31:10.705Z","title":"All versions of package merge-change are vulnerable to Prototype Pollution via the utils.set function.","description":"All versions of package merge-change are vulnerable to Prototype Pollution via the utils.set function.","published":"2021-08-11T18:15:07.000Z","lastModified":"2026-06-17T03:38:44.000Z","status":"Modified","sourceIdentifier":"report@snyk.io","cvss":{"version":"3.1","score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-1321"],"affected":["merge-change project/merge-change"],"epss":{"score":0.01084,"percentile":0.64982,"date":"2026-10-26","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 (1.08%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://github.com/VladimirShestakov/merge-change/blob/9901f145e06158f284f52de42e6ba5b0f702fb65/utils.js%23L89-L123","tags":["Broken Link"],"source":"report@snyk.io"},{"url":"https://snyk.io/vuln/SNYK-JS-MERGECHANGE-1310985","tags":["Exploit","Third Party Advisory"],"source":"report@snyk.io"},{"url":"https://github.com/VladimirShestakov/merge-change/blob/9901f145e06158f284f52de42e6ba5b0f702fb65/utils.js%23L89-L123","tags":["Broken Link"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://snyk.io/vuln/SNYK-JS-MERGECHANGE-1310985","tags":["Exploit","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-23421","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."}