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CVE-2021-41121

27
FAUCET Score

CVE-2021-41121 is a memory corruption vulnerability affecting Vyper, a Pythonic Smart Contract Language for the EVM, specifically versions prior to 0.3.0. It arises from an incorrect stack pointer during function calls within literal structs, leading to a CVSSv3.1 score of 8.8 (High) due to potential for complete compromise of confidentiality, integrity, and availability with low attack complexity. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.3.0CPE matchmatch criteria
cpe:2.3:a:vyperlang:vyper:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.6
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.04%
Probability of exploitation in next 30 days
EPSS Percentile
60.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0104 is in the 57th percentile among its peer group of 17,823 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
pippatch availablevia ghsa
Product: vyperFixed in: 0.3.0

Vendor Advisories (1)

pipGHSA-xv8x-pr4h-73jvhigh

Memory corruption when returning a literal struct with a private call inside of it

Oct 12, 2021

References

github.com / vyperlang/vyper/pull/2447
PatchThird Party Advisory
github.com / vyperlang/vyper/security/advisories/GHSA-xv8x-pr4h-73jv
Third Party Advisory