CVSS 3.1
9.8 criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HCVE-2021-41264
Critical (9.8) in openzeppelin contracts. EPSS 1.5% chance of exploitation in the next 30 days. Fixed in @openzeppelin/contracts 4.3.2.
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).
Severity
- EPSS
- 1.5% chance of exploitation in the next 30 days; higher than 74% of CVEs (scores of 2026-10-31)
- CWE
- CWE-665
- Published
- Modified
- Record from
- the NVD, synced
Affected
- openzeppelin:contracts
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-5vp3-v4hc-gx76 | npm | @openzeppelin/contracts | >=4.1.0 <4.3.2 | 4.3.2 |
| GHSA-5vp3-v4hc-gx76 | npm | @openzeppelin/contracts-upgradeable | >=4.1.0 <4.3.2 | 4.3.2 |
References
- https://forum.openzeppelin.com/t/security-advisory-initialize-uups-implementation-contracts/15301
- https://github.com/OpenZeppelin/openzeppelin-contracts/commit/024cc50df478d2e8f78539819749e94d6df60592
- https://github.com/OpenZeppelin/openzeppelin-contracts/security/advisories/GHSA-5vp3-v4hc-gx76
- https://forum.openzeppelin.com/t/security-advisory-initialize-uups-implementation-contracts/15301
- https://github.com/OpenZeppelin/openzeppelin-contracts/commit/024cc50df478d2e8f78539819749e94d6df60592