{"id":"CVE-2020-7765","url":"https://www.cyber-defence.io/tools/cve/CVE-2020-7765","generatedAt":"2026-10-28T00:30:46.593Z","title":"This vulnerability relates to the deepExtend function within the DeepCopy.ts file.","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.","published":"2020-11-16T12:15:14.000Z","lastModified":"2026-06-17T03:25:24.000Z","status":"Modified","sourceIdentifier":"report@snyk.io","cvss":{"version":"3.1","score":5.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"},"cwe":[],"affected":["google/firebase\\/util"],"epss":{"score":0.00569,"percentile":0.46878,"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":"low","text":"Lower severity and a low EPSS score (0.57%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://github.com/firebase/firebase-js-sdk/commit/9cf727fcc3d049551b16ae0698ac33dc2fe45ada","tags":["Patch","Third Party Advisory"],"source":"report@snyk.io"},{"url":"https://github.com/firebase/firebase-js-sdk/pull/4001","tags":["Patch","Third Party Advisory"],"source":"report@snyk.io"},{"url":"https://snyk.io/vuln/SNYK-JS-FIREBASEUTIL-1038324","tags":["Exploit","Third Party Advisory"],"source":"report@snyk.io"},{"url":"https://github.com/firebase/firebase-js-sdk/commit/9cf727fcc3d049551b16ae0698ac33dc2fe45ada","tags":["Patch","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/firebase/firebase-js-sdk/pull/4001","tags":["Patch","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://snyk.io/vuln/SNYK-JS-FIREBASEUTIL-1038324","tags":["Exploit","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2020-7765","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."}