What is CVE-2021-41264?

CVE-2021-41264 is a vulnerability in OpenZeppelin Contracts library that affects upgradeable contracts using UUPSUpgradeable and allows for attacks on uninitialized implementation contracts.

How severe is CVE-2021-41264?

CVE-2021-41264 has a severity rating of 9.8 (critical).

Which versions of OpenZeppelin Contracts are affected by CVE-2021-41264?

Versions between 4.1.0 and 4.3.2 of OpenZeppelin Contracts are affected by CVE-2021-41264.

How can I fix CVE-2021-41264?

To fix CVE-2021-41264, upgrade to version 4.3.2 of @openzeppelin/contracts.

Where can I find more information about CVE-2021-41264?

More information about CVE-2021-41264 can be found in the OpenZeppelin forum and GitHub repositories.

Vulnerability/
CVE-2021-41264

critical

9.8

CWE

665

12/11/2021

15/11/2021

CVE-2021-41264

First published: Fri Nov 12 2021(Updated: )

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).

Credit: security-advisories@github.com

Affected Software	Affected Version	How to fix
Openzeppelin Contracts	>=4.1.0<4.3.2

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Frequently Asked Questions

What is CVE-2021-41264?
CVE-2021-41264 is a vulnerability in OpenZeppelin Contracts library that affects upgradeable contracts using UUPSUpgradeable and allows for attacks on uninitialized implementation contracts.
How severe is CVE-2021-41264?
CVE-2021-41264 has a severity rating of 9.8 (critical).
Which versions of OpenZeppelin Contracts are affected by CVE-2021-41264?
Versions between 4.1.0 and 4.3.2 of OpenZeppelin Contracts are affected by CVE-2021-41264.
How can I fix CVE-2021-41264?
To fix CVE-2021-41264, upgrade to version 4.3.2 of @openzeppelin/contracts.
Where can I find more information about CVE-2021-41264?
More information about CVE-2021-41264 can be found in the OpenZeppelin forum and GitHub repositories.

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vendor/openzeppelin
canonical/openzeppelin contracts
version/openzeppelin contracts/4.1.0

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