How severe is CVE-2021-41121?

CVE-2021-41121 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-41121 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-41121?

CVE-2021-41121 affects Vyperlang Vyper. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-41121?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-41121 published?

CVE-2021-41121 was published on 2021-10-06 and last updated on 2026-06-17.

CVE-2021-41121

CVE-2021-41121 is a high-severity vulnerability in Vyperlang Vyper with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-119.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 6.5
EPSS exploit prediction: 1% (60th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Vyperlang Vyper
Published: 2021-10-06
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2021-41121?: 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.
How severe is CVE-2021-41121?: CVE-2021-41121 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-41121 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-41121?: CVE-2021-41121 affects Vyperlang Vyper. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-41121?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-41121 published?: CVE-2021-41121 was published on 2021-10-06 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:vyperlang:vyper:*:*:*:*:*:*:*:*

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