{"id":"CVE-2021-23543","aliases":["EUVD-2022-0670","GHSA-q4j7-v27r-fgcx"],"status":"published","title":"Sandbox Bypass","description":"All versions of package realms-shim are vulnerable to Sandbox Bypass via a Prototype Pollution attack vector.","severity":{"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/E:P","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.0182,"percentile":0.79056,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-1321"],"published":"2022-01-07T20:05:19Z","modified":"2026-06-17T03:38:49Z","affected":[{"source":"ghsa","ecosystem":"npm","package":"realms-shim","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"1.2.2"}]}]},{"source":"osv","ecosystem":"npm","package":"realms-shim","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"last_affected":"1.2.2"}]}]}],"products":[{"vendor":"agoric","product":"realms-shim"}],"references":[{"url":"https://www.npmjs.com/package/realms-shim","tags":["x_refsource_MISC","x_transferred","Product","Third Party Advisory","web"]},{"url":"https://snyk.io/vuln/SNYK-JS-REALMSSHIM-2309908","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-23543","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-q4j7-v27r-fgcx"},{"url":"https://github.com/Agoric/realms-shim","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2021-23543","title":"Sandbox Bypass","description":"All versions of package realms-shim are vulnerable to Sandbox Bypass via a Prototype Pollution attack vector.","status":"published","published":"2022-01-07T20:05:19.701Z","modified":"2024-09-16T20:06:18.093Z","cvss":[{"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/E:P","level":"critical","assessor":"cna"}],"updated_at":"2026-11-02T14:33:00.819444Z"}],"euvd":[{"id":"EUVD-2022-0670","description":"All versions of package realms-shim are vulnerable to Sandbox Bypass via a Prototype Pollution attack vector.","status":"published","published":"2022-01-07T20:05:19Z","modified":"2024-09-16T20:06:18Z","cvss":[{"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/E:P","level":"critical"}],"updated_at":"2026-11-03T00:55:17.319093Z"}],"ghsa":[{"id":"GHSA-q4j7-v27r-fgcx","title":"Prototype Pollution in realms-shim","description":"All versions of package realms-shim are vulnerable to Sandbox Bypass via a Prototype Pollution attack vector.","status":"published","published":"2022-01-13T15:00:36Z","modified":"2023-02-03T05:04:24Z","cvss":[{"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"}],"cwes":["CWE-1321"],"updated_at":"2026-11-02T14:36:41.967989Z"}],"nvd":[{"id":"CVE-2021-23543","description":"All versions of package realms-shim are vulnerable to Sandbox Bypass via a Prototype Pollution attack vector.","status":"published","published":"2022-01-10T14:10:16.963Z","modified":"2026-06-17T03:38:49.113Z","cvss":[{"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":"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":"2026-11-02T14:07:03.418194Z"}],"osv":[{"id":"GHSA-q4j7-v27r-fgcx","title":"Prototype Pollution in realms-shim","description":"All versions of package realms-shim are vulnerable to Sandbox Bypass via a Prototype Pollution attack vector.","status":"published","published":"2022-01-13T15:00:36Z","modified":"2026-03-13T21:57:01.858728Z","cvss":[{"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"}],"cwes":["CWE-1321"],"updated_at":"2026-11-02T15:46:54.055966Z"}]}}