cvedb.io
CVE-2021-41264
CRITICAL · CVSS 9.8
EPSS exploitation probability: 0%
Published 2021-11-12T18:15:07.733 · Last modified 2026-06-17T04:08:11.910

Summary

OpenZeppelin Contracts is a library for smart contract development. In affected versions upgradeable contracts using `UUPSUpgradeable` may be vulnerable to an attack affecting uninitialized implementation contracts. A fix is included in version 4.3.2 of `@openzeppelin/contracts` and `@openzeppelin/contracts-upgradeable`. For users unable to upgrade; initialize implementation contracts using `UUPSUpgradeable` by invoking the initializer function (usually called `initialize`). An example is provided [in the forum](https://forum.openzeppelin.com/t/security-advisory-initialize-uups-implementation-contracts/15301).

Affected products

openzeppelin — contracts

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References

This product uses data from the NVD API but is not endorsed or certified by the NVD. Informational only; not professional security advice.