What is CVE-2023-30541?

CVE-2023-30541 is a medium-severity vulnerability in Openzeppelin Contracts, classified under CWE-436. CVSS score: 5.3/10. Published 2023-04-17.

How severe is CVE-2023-30541?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Is CVE-2023-30541 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Openzeppelin Contracts

CVE-2023-30541

OpenZeppelin Contracts is a library for secure smart contract development. A function in the implementation contract may be inaccessible if its selector clashes with one of the proxy's own selectors. Specifically, if the clashing function has a different signature with incompatible ABI encoding, the proxy could revert while attempting to decode the arguments from calldata. The probability of an accidental clash is negligible, but one could be caused deliberately and could cause a reduction in availability. The issue has been fixed in version 4.8.3. As a workaround if a function appears to be inaccessible for this reason, it may be possible to craft the calldata such that ABI decoding does not fail at the proxy and the function is properly proxied through.

Published 2023-04-17 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.008 (55.3th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 55.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Openzeppelin Contracts
Openzeppelin Contracts Upgradeable
Openzeppelin Openzeppelin-Contracts — versions @openzeppelin/contracts: >= 3.2.0, < 4.8.3, @openzeppelin/contracts-upgradeable: >=3.2.0, <4.8.3

Weakness classification (CWE)

CWE-436

Public proof-of-concept exploits

davidlpoole/eth-erc20-governance

References

github.com/OpenZeppelin/openzeppelin-contracts/security/advisories/GHSA-mx2q-35… (Vendor Advisory)
github.com/OpenZeppelin/openzeppelin-contracts/pull/4154 (Patch)
github.com/OpenZeppelin/openzeppelin-contracts/releases/tag/v4.8.3 (Release Notes)

Frequently asked questions

What is CVE-2023-30541?: CVE-2023-30541 is a medium-severity vulnerability in Openzeppelin Contracts, classified under CWE-436. CVSS score: 5.3/10. Published 2023-04-17.
How severe is CVE-2023-30541?: Medium severity. CVSS v3 base score is 5.3 out of 10.
Is CVE-2023-30541 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.