CVE-2021-46320: Openzeppelin

High severity, CVSS 7.5. EPSS: 1.2% chance of exploitation in the next 30 days.

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.

Affected products

• Openzeppelin Openzeppelin: from 3.2.0, up to and including 4.4.0

Published 2022-02-04. Last modified 2026-06-17.