CVE-2022-24787Public exploitNetwork attack vector

Smart-contract logic manipulation via incomplete bytestring comparison

Published Apr 4, 2022 · Updated Apr 23, 2025

Incorrect bytestring comparison in Vyper 0.3.1 and earlier allows remote attackers to alter smart-contract logic via crafted inputs. Equality code generation for Bytes and String values of at most 32 bytes compares a full word without checking lengths or masking unused bytes. A deployed contract must apply the affected comparison to attacker-controlled values; false equality can redirect contract decisions and state changes.

CVSS severity7.5
High
EPSS probability1.03%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect bytestring comparison in Vyper 0.3.1 and earlier allows remote attackers to alter smart-contract logic via crafted inputs. Equality code generation for Bytes and String values of at most 32 bytes compares a full word without checking lengths or masking unused bytes. A deployed contract must apply the affected comparison to attacker-controlled values; false equality can redirect contract decisions and state changes.

The record

CVE
CVE-2022-24787
Published
Apr 4, 2022
Updated
Apr 23, 2025
Vendor
Vyper
Product
Vyper
Classifications
CWE-697
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 4, 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=<= 0.3.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Vyper · Vyperversion=<= 0.3.1

Published CVSS scores

7.5NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
5.0NIST National Vulnerability DatabaseAV:N/AC:L/Au:N/C:N/I:P/A:N
7.5GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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.

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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-697Incorrect Comparison

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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