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Vulnerabilities

Security fix · CVE-2021-48020

VVE-2021-0001: Memory corruption using function calls within arrays

Published Apr 19, 2021 · catalog updated Oct 24, 2026 · VVE-2021-0001: Memory corruption using

Last checked Oct 25, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2021-48020. EPSS is 0.28%. Act only if a listed version of VVE-2021-0001: Memory corruption using is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (VVE-2021-0001: Memory corruption using).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Unknown—
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.28%
Remediation
Advisory link
Affected products
PyPI vyper

### Impact When performing a function call inside an array, there is a memory corruption issue that occurs because of an incorrect pointer to the the tip of the stack. ### Patches This issue was partially fixed in [VVE-2020-0004](https://github.com/vyperlang/vyper/security/advisories/GHSA-2r3x-4mrv-mcxf), however the fix did not update similar code for arrays, which had a similar issue. The issue is fully fixed in https://github.com/vyperlang/vyper/pull/2345

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • PyPI vyper0 → 0.2.12

How to fix CVE-2021-48020

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2021-48020. EPSS is 0.28%. Act only if a listed version of VVE-2021-0001: Memory corruption using is installed.

Which versions are affected?

Compare what you have installed with 0 → 0.2.12. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-129: Improper Validation of Array Index. EPSS 0.28%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 19, 2021 · GitHub Advisory Database

    Detected

    ### Impact When performing a function call inside an array, there is a memory corruption issue that occurs because of an incorrect pointer to the the tip of the stack. ### Patches This issue was partially fixed in [VVE-2020-0004](https://github.com/vyperlang/vyper/security/advisories/GHSA-2r3x-4mrv-mcxf), however the fix did not update similar code for arrays, which had a similar issue. The issue

  2. Oct 24, 2026 · GitHub Advisory Database

    Fix available

    vyper fixed in 0.2.12

  3. Oct 24, 2026 · GitHub Advisory Database

    Fix available

    vyper fixed in 0.2.12

  4. Oct 24, 2026 · GitHub Advisory Database

    Updated

    ### Impact When performing a function call inside an array, there is a memory corruption issue that occurs because of an incorrect pointer to the the tip of the stack. ### Patches This issue was partially fixed in [VVE-2020-0004](https://github.com/vyperlang/vyper/security/advisories/GHSA-2r3x-4mrv-mcxf), however the fix did not update similar code for arrays, which had a similar issue. The issue

Sources

References

Freshness

Last verified in this catalog Oct 24, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • GitHub Advisory DatabaseOct 25, 2026
  • OpenSSF OSV / OSV ScannerOct 25, 2026
  • CVE.orgOct 24, 2026
  • FIRST EPSSOct 24, 2026