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CVE-2021-41264— UUPSUpgradeable vulnerability in OpenZeppelin Contracts

Quick assessment

Affected
OpenZeppelin openzeppelin-contracts
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenZeppelin是一个应用软件。一个安全区块链应用的标准。 OpenZeppelin Contracts 4.3.2之前版本存在安全漏洞，攻击者可利用该漏洞进行未初始化契约攻击。

CVSS 9.8 · Critical EPSS 1.49% · P74
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I. Basic Information for CVE-2021-41264

Vulnerability Information
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Vulnerability Title
UUPSUpgradeable vulnerability in OpenZeppelin Contracts
Source: CVE Program / CVE List V5
Vulnerability 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).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
初始化不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
OpenZeppelin 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenZeppelin是一个应用软件。一个安全区块链应用的标准。 OpenZeppelin Contracts 4.3.2之前版本存在安全漏洞，攻击者可利用该漏洞进行未初始化契约攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
OpenZeppelin openzeppelin-contracts >= 4.1.0 < 4.3.2 -

II. Public POCs for CVE-2021-41264

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III. Intelligence Information for CVE-2021-41264

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Patches & Fixes for CVE-2021-41264 (1)

Vendor Advisories for CVE-2021-41264 (1)

Other References for CVE-2021-41264 (1)

IV. Related Vulnerabilities

Same product: openzeppelin-contracts
Same vendor: OpenZeppelin
Same weakness: CWE-665

V. Comments for CVE-2021-41264

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