{"cve":"CVE-2021-46320","nvd":{"published":"2022-02-04T12:15:07.623","modified":"2026-06-17T04:14:43.983","status":"Modified","description":"In OpenZeppelin <=v4.4.0, initializer functions that are invoked separate from contract creation (the most prominent example being minimal proxies) may be reentered if they make an untrusted non-view external call. Once an initializer has finished running it can never be re-executed. However, an exception put in place to support multiple inheritance made reentrancy possible, breaking the expectation that there is a single execution.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","score":7.5},"cwes":["CWE-665"],"references":["https://github.com/OpenZeppelin/openzeppelin-contracts/security/advisories/GHSA-9c22-pwxw-p6hx","https://github.com/OpenZeppelin/openzeppelin-contracts/security/advisories/GHSA-9c22-pwxw-p6hx"],"products":["openzeppelin:openzeppelin"],"source":"nvd","synced_at":"2026-10-19T21:27:20.926095847+00:00"},"epss":{"cve":"CVE-2021-46320","score":0.01217,"percentile":0.68611,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-88g8-f5mf-f5rj","url":"https://osv.dev/vulnerability/GHSA-88g8-f5mf-f5rj","summary":"Improper Initialization in OpenZeppelin","modified":"2026-07-16T03:56:17.546633851Z","packages":[{"ecosystem":"npm","name":"@openzeppelin/contracts","purl":"pkg:npm/%40openzeppelin/contracts","ranges":["<4.4.1"],"fixed":["4.4.1"]}]},{"id":"GHSA-9c22-pwxw-p6hx","url":"https://osv.dev/vulnerability/GHSA-9c22-pwxw-p6hx","summary":"OpenZeppelin Contracts initializer reentrancy may lead to double initialization","modified":"2026-07-16T03:59:27.534685008Z","packages":[{"ecosystem":"npm","name":"@openzeppelin/contracts","purl":"pkg:npm/%40openzeppelin/contracts","ranges":[">=3.2.0 <4.4.1"],"fixed":["4.4.1"]},{"ecosystem":"npm","name":"@openzeppelin/contracts-upgradeable","purl":"pkg:npm/%40openzeppelin/contracts-upgradeable","ranges":[">=3.2.0 <4.4.1"],"fixed":["4.4.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}