CVE-2024-32648Public exploitNetwork attack vector

Contract reentrancy via omitted default-function locks

Published Apr 25, 2024 · Updated Aug 2, 2024

Improper locking in Vyper before 0.3.0 allows remote attackers to bypass reentrancy protection in compiled contracts via a default function. The code generator accepts @nonreentrant on default but emits the fallback path without the requested storage lock. Exploitation requires a deployed contract compiled by an affected release with a decorated default function; the vendor's search found none in production.

CVSS severity5.3
Medium
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper locking in Vyper before 0.3.0 allows remote attackers to bypass reentrancy protection in compiled contracts via a default function. The code generator accepts @nonreentrant on default but emits the fallback path without the requested storage lock. Exploitation requires a deployed contract compiled by an affected release with a decorated default function; the vendor's search found none in production.

The record

CVE
CVE-2024-32648
Published
Apr 25, 2024
Updated
Aug 2, 2024
Vendor
Vyper
Product
Vyper
Classifications
CWE-667
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 25, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=*
  2. Affected versionversion=< 0.3.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Vyper · Vyperversion=*; version=< 0.3.0

Published CVSS scores

5.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-667Improper Locking

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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