CVE-2021-41264

Critical

Description

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).

SeverityCritical

CVSS9.8

Exploit probability—

ProductOpenzeppelin Contracts

PublishedNov 12, 2021

First seenNov 12, 2021

Weakness typeCWE-665CWE-665

How to fix

Update

openzeppelin contracts4.3.2 or later
@openzeppelin/contracts4.3.2 or later
@openzeppelin/contracts-upgradeable4.3.2 or later

Affected products

Product	Affected versions	Fixed in
openzeppelin contracts	4.1.0 ≤ v < 4.3.2	4.3.2
@openzeppelin/contractsnpm	4.1.0 ≤ v < 4.3.2	4.3.2
@openzeppelin/contracts-upgradeablenpm	4.1.0 ≤ v < 4.3.2	4.3.2

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