{"id":"CVE-2021-23663","aliases":["EUVD-2021-2604","GHSA-wjpc-cgvw-xx23"],"status":"published","title":"Prototype Pollution","description":"All versions of package sey are vulnerable to Prototype Pollution via the deepmerge() function.","severity":{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L/E:P","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.0121,"percentile":0.68809,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-1321"],"published":"2021-12-10T20:05:28Z","modified":"2026-06-17T03:38:51Z","affected":[{"source":"ghsa","ecosystem":"npm","package":"sey","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"0.3.0"}]}]},{"source":"osv","ecosystem":"npm","package":"sey","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"last_affected":"0.3.0"}]}]}],"products":[{"vendor":"sey_project","product":"sey"}],"references":[{"url":"https://snyk.io/vuln/SNYK-JS-SEY-1727592","tags":["x_refsource_MISC","x_transferred","Exploit","Mitigation","Third Party Advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-23663","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-wjpc-cgvw-xx23"},{"url":"https://github.com/eserozvataf/sey","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2021-23663","title":"Prototype Pollution","description":"All versions of package sey are vulnerable to Prototype Pollution via the deepmerge() function.","status":"published","published":"2021-12-10T20:05:28.884Z","modified":"2024-09-16T18:07:55.229Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L/E:P","level":"medium","assessor":"cna"}],"updated_at":"2026-11-02T14:33:00.819444Z"}],"euvd":[{"id":"EUVD-2021-2604","description":"All versions of package sey are vulnerable to Prototype Pollution via the deepmerge() function.","status":"published","published":"2021-12-10T20:05:28Z","modified":"2024-09-16T18:07:55Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L/E:P","level":"medium"}],"updated_at":"2026-11-03T00:55:35.786755Z"}],"ghsa":[{"id":"GHSA-wjpc-cgvw-xx23","title":"Prototype Pollution in sey","description":"All versions of package `sey` are vulnerable to Prototype Pollution via the `deepmerge()` function.","status":"published","published":"2021-12-16T14:29:34Z","modified":"2023-09-08T21:05:01Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L","level":"medium"}],"cwes":["CWE-1321"],"updated_at":"2026-11-02T14:37:03.287418Z"}],"nvd":[{"id":"CVE-2021-23663","description":"All versions of package sey are vulnerable to Prototype Pollution via the deepmerge() function.","status":"published","published":"2021-12-10T20:15:08.453Z","modified":"2026-06-17T03:38:51.35Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L","level":"medium","assessor":"secondary"},{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"cwes":["CWE-1321"],"updated_at":"2026-11-02T14:07:02.189991Z"}],"osv":[{"id":"GHSA-wjpc-cgvw-xx23","title":"Prototype Pollution in sey","description":"All versions of package `sey` are vulnerable to Prototype Pollution via the `deepmerge()` function.","status":"published","published":"2021-12-16T14:29:34Z","modified":"2023-11-08T04:05:12.443988Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L","level":"medium"}],"cwes":["CWE-1321"],"updated_at":"2026-11-02T15:46:58.767335Z"}]}}