Vulnerability Description
Vyper before 0.2.9 deploys forwarder proxies through the built-in create_forwarder_to function that report a fixed 4096-byte RETURNDATASIZE rather than the actual return data size. Calls through these proxies can yield corrupted data when a function returns more than 4096 bytes without return data sanitation, and fail strict return-size checks such as SafeERC20.safeTransfer.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/vyperlang/vyper/security/advisories/GHSA-375m-5fvv-xq23
- https://www.vulncheck.com/advisories/vyper-before-0.2.9-incorrect-returndatasize
FAQ
What is CVE-2021-48019?
CVE-2021-48019 is a vulnerability with a CVSS score of 4.8 (MEDIUM). Vyper before 0.2.9 deploys forwarder proxies through the built-in create_forwarder_to function that report a fixed 4096-byte RETURNDATASIZE rather than the actual return data size. Calls through these...
How severe is CVE-2021-48019?
CVE-2021-48019 has been rated MEDIUM with a CVSS base score of 4.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-48019?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.