CVE-2024-24561Public exploitNetwork attack vector

Contract-data exposure and corruption via slice overflow

Published Feb 1, 2024 · Updated Jun 17, 2025

Out-of-bounds access in Vyper 0.3.10 and earlier allows remote attackers to read or corrupt contract data through crafted slice arguments. The built-in slice runtime check adds nonliteral start and length values without detecting uint256 overflow, so a wrapped sum passes the source-length comparison. Reachability requires a compiled contract to pass attacker-controlled nonliteral values to slice; exploitation can expose storage, memory, or calldata or corrupt an array length.

CVSS severity9.8
Critical
EPSS probability0.90%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds access in Vyper 0.3.10 and earlier allows remote attackers to read or corrupt contract data through crafted slice arguments. The built-in slice runtime check adds nonliteral start and length values without detecting uint256 overflow, so a wrapped sum passes the source-length comparison. Reachability requires a compiled contract to pass attacker-controlled nonliteral values to slice; exploitation can expose storage, memory, or calldata or corrupt an array length.

The record

CVE
CVE-2024-24561
Published
Feb 1, 2024
Updated
Jun 17, 2025
Vendor
Vyper
Product
Vyper
Classifications
CWE-787, CWE-119, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 1, 2024CVE publishedPublication date reported by the CVE source.
  2. Jun 17, 2025Record 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=<= 0.3.10

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Vyper · Vyperversion=<= 0.3.10

Published CVSS scores

9.8GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8NISTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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-787Out-of-bounds Write
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1190Exploit Public-Facing Application

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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