CVE-2021-41264

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.

Weakness

The product does not initialize or incorrectly initializes a resource, which might leave the resource in an unexpected state when it is accessed or used.

Affected Software

Name	Vendor	Start Version	End Version
Contracts	Openzeppelin	4.1.0 (including)	4.3.2 (excluding)

Potential Mitigations

Use a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
For example, in Java, if the programmer does not explicitly initialize a variable, then the code could produce a compile-time error (if the variable is local) or automatically initialize the variable to the default value for the variable’s type. In Perl, if explicit initialization is not performed, then a default value of undef is assigned, which is interpreted as 0, false, or an equivalent value depending on the context in which the variable is accessed.

NVD	https://nvd.nist.gov/vuln/detail/CVE-2021-41264
CWE	https://cwe.mitre.org/data/definitions/665.html

Improper Initialization

Weakness

Affected Software

Potential Mitigations

References

CVE-2021-41264

Improper Initialization

Weakness

Affected Software

Potential Mitigations

Related Attack Patterns

References