{"id":"CVE-2020-7765","aliases":["EUVD-2021-1064","GHSA-fpm5-vv97-jfwg","SNYK-JS-FIREBASEUTIL-1038324"],"status":"published","title":"Prototype Pollution","description":"This affects the package @firebase/util before 0.3.4. This vulnerability relates to the deepExtend function within the DeepCopy.ts file. Depending on if user input is provided, an attacker can overwrite and pollute the object prototype of a program.","severity":{"version":"3.1","score":5.6,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00569,"percentile":0.4759,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-400"],"published":"2020-11-16T12:00:17Z","modified":"2026-10-20T10:54:40Z","fixes":[{"ecosystem":"npm","package":"@firebase/util","fixed_in":["0.3.4"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"@firebase/util","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.3.4"}]}]},{"source":"osv","ecosystem":"npm","package":"@firebase/util","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.3.4"}]}]}],"products":[{"vendor":"google","product":"firebase\\/util"}],"references":[{"url":"https://snyk.io/vuln/SNYK-JS-FIREBASEUTIL-1038324","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory","evidence","web"]},{"url":"https://github.com/firebase/firebase-js-sdk/commit/9cf727fcc3d049551b16ae0698ac33dc2fe45ada","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix","web"]},{"url":"https://github.com/firebase/firebase-js-sdk/pull/4001","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-7765","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-fpm5-vv97-jfwg"}],"sources":{"cve":[{"id":"CVE-2020-7765","title":"Prototype Pollution","description":"This affects the package @firebase/util before 0.3.4. This vulnerability relates to the deepExtend function within the DeepCopy.ts file. Depending on if user input is provided, an attacker can overwrite and pollute the object prototype of a program.","status":"published","published":"2020-11-16T12:00:17.953Z","modified":"2024-09-17T01:05:55.551Z","cvss":[{"version":"3.1","score":5.6,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C","level":"medium","assessor":"cna"}],"updated_at":"2026-11-02T14:35:58.787905Z"}],"euvd":[{"id":"EUVD-2021-1064","description":"This affects the package @firebase/util before 0.3.4. This vulnerability relates to the deepExtend function within the DeepCopy.ts file. Depending on if user input is provided, an attacker can overwrite and pollute the object prototype of a program.","status":"published","published":"2020-11-16T12:00:17Z","modified":"2024-09-17T01:05:55Z","cvss":[{"version":"3.1","score":5.6,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C","level":"medium"}],"updated_at":"2026-11-03T00:28:53.188643Z"}],"ghsa":[{"id":"GHSA-fpm5-vv97-jfwg","title":"Uncontrolled Resource Consumption in firebase","description":"This affects the package @firebase/util before 0.3.4. This vulnerability relates to the deepExtend function within the DeepCopy.ts file. Depending on if user input is provided, an attacker can overwrite and pollute the object prototype of a program.","status":"published","published":"2021-05-18T01:57:24Z","modified":"2023-02-01T05:05:36Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T14:36:34.917834Z"}],"nvd":[{"id":"CVE-2020-7765","description":"This affects the package @firebase/util before 0.3.4. This vulnerability relates to the deepExtend function within the DeepCopy.ts file. Depending on if user input is provided, an attacker can overwrite and pollute the object prototype of a program.","status":"published","published":"2020-11-16T12:15:14.32Z","modified":"2026-06-17T03:25:24.407Z","cvss":[{"version":"3.1","score":5.6,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"medium","assessor":"secondary"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:P/A:N","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:06:24.137599Z"}],"osv":[{"id":"CVE-2020-7765","description":"This affects the package @firebase/util before 0.3.4. This vulnerability relates to the deepExtend function within the DeepCopy.ts file. Depending on if user input is provided, an attacker can overwrite and pollute the object prototype of a program.","status":"published","published":"2020-11-16T12:15:14.32Z","modified":"2026-10-20T10:54:40.352558867Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:17.34531Z"},{"id":"GHSA-fpm5-vv97-jfwg","title":"Uncontrolled Resource Consumption in firebase","description":"This affects the package @firebase/util before 0.3.4. This vulnerability relates to the deepExtend function within the DeepCopy.ts file. Depending on if user input is provided, an attacker can overwrite and pollute the object prototype of a program.","status":"published","published":"2021-05-18T01:57:24Z","modified":"2026-09-10T03:49:26.77934674Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T15:46:46.760785Z"}]}}