CVE-2021-41121

Name: CVE-2021-41121
Creator: NVD / NIST
Published: 2021-10-06T18:15:10.897+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 1.04%

Last modified Jun 17, 2026

CVE-2021-41121 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. Vyper is a Pythonic Smart Contract Language for the EVM. In affected versions when performing a function call inside a literal struct, there is a memory corruption issue that occurs because of an incorrect pointer to the the top of the stack. EPSS estimates a 1.04% chance of exploitation in the next 30 days.

Description

Vyper is a Pythonic Smart Contract Language for the EVM. In affected versions when performing a function call inside a literal struct, there is a memory corruption issue that occurs because of an incorrect pointer to the the top of the stack. This issue has been resolved in version 0.3.0.

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

1.04%

59.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Vyperlang	Vyper	< 0.3.0

References

https://github.com/vyperlang/vyper/pull/2447Patch, Third Party Advisory
https://github.com/vyperlang/vyper/security/advisories/GHSA-xv8x-pr4h-73jvThird Party Advisory
https://github.com/vyperlang/vyper/pull/2447Patch, Third Party Advisory
https://github.com/vyperlang/vyper/security/advisories/GHSA-xv8x-pr4h-73jvThird Party Advisory

Timeline

Published: Oct 6, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-41121?

How severe is CVE-2021-41121?

CVE-2021-41121 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 1.04% probability of exploitation in the next 30 days.

How do I fix CVE-2021-41121?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-41121?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST