CVE-2022-24788Network attack vector

Smart-contract memory corruption via unclamped return data

Published Apr 13, 2022 · Updated Apr 23, 2025

Buffer overrun in Vyper before 0.3.2 allows attackers to corrupt smart-contract memory via oversized external return data. The JSON_ABI path hard-codes a length of one for JSON-imported Bytes signatures and emits bytecode that copies dynamic return data without a runtime clamp. A contract must be compiled from a JSON interface with a Bytes return type and then call an external contract that supplies oversized return data.

CVSS severity7.1
High
EPSS probability0.99%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overrun in Vyper before 0.3.2 allows attackers to corrupt smart-contract memory via oversized external return data. The JSON_ABI path hard-codes a length of one for JSON-imported Bytes signatures and emits bytecode that copies dynamic return data without a runtime clamp. A contract must be compiled from a JSON interface with a Bytes return type and then call an external contract that supplies oversized return data.

The record

CVE
CVE-2022-24788
Published
Apr 13, 2022
Updated
Apr 23, 2025
Vendor
Vyper
Product
Vyper
Classifications
CWE-120, CWE-119
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 13, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 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=< 0.3.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Vyper · Vyperversion=< 0.3.2

Published CVSS scores

7.1GitHub Advisory DatabaseCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:H/VA:N/SC:N/SI:N/SA: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer

Public exploit references

No public exploit references are available in this record.

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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