Reentrancy Vulnerability in OpenZeppelin Smart Contracts
CVE-2021-46320

7.5HIGH

Key Information:

Vendor

Openzeppelin

Status
Openzeppelin
Vendor
CVE Published:
4 February 2022

What is CVE-2021-46320?

In OpenZeppelin versions up to 4.4.0, a reentrancy vulnerability exists in initializer functions that can be invoked outside of contract creation. This situation primarily arises with minimal proxies that invoke untrusted non-view external calls. The design intended to safeguard initializer execution allows for a condition where initializers can be re-entered under specific circumstances, especially due to an exception crafted to facilitate multiple inheritance. As a result, the fundamental assumption of single execution is violated, potentially allowing attackers to exploit this flaw.

References

https://github.com/OpenZeppelin/openzeppelin-contracts/se...
x_refsource_MISC

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.