OpenZeppelin Contracts's ERC2771Context with custom forwarder may lead to zero-valued _msgSender
CVE-2023-40014

5.3MEDIUM

Key Information:

Vendor: Openzeppelin
Status: Openzeppelin-contracts
Vendor: CVE Published:; 10 August 2023

🔔 Create Openzeppelin Vulnerability Alert

What is CVE-2023-40014?

OpenZeppelin Contracts is a library for secure smart contract development. Starting in version 4.0.0 and prior to version 4.9.3, contracts using ERC2771Context along with a custom trusted forwarder may see _msgSender return address(0) in calls that originate from the forwarder with calldata shorter than 20 bytes. This combination of circumstances does not appear to be common, in particular it is not the case for MinimalForwarder from OpenZeppelin Contracts, or any deployed forwarder the team is aware of, given that the signer address is appended to all calls that originate from these forwarders. The problem has been patched in v4.9.3.

Human OS v1.0:
Ageing Is an Unpatched Zero-Day Vulnerability.

Remediate biological technical debt. Prime Ageing uses 95% high-purity SIRT6 activation to maintain genomic integrity and bolster systemic resilience.

Deploy the Patch