Incorrect behavior via unchecked external returns
Published Apr 13, 2022 · Updated Apr 22, 2025
Integer overflow in Vyper before 0.3.2 allows remote attackers to cause incorrect smart-contract behavior via crafted external calls. The compiler fails to clamp returndata from interface calls such as returns_int128() when those calls occur inside complex expressions, allowing out-of-range values to be interpreted as valid types. Exploitation requires a contract that makes the affected external call and a callee capable of returning out-of-bounds data; the resulting impact is incorrect contract behavior with confidentiality, integrity, and availability consequences described by the published CVSS assessments.
Summary
What happened
Integer overflow in Vyper before 0.3.2 allows remote attackers to cause incorrect smart-contract behavior via crafted external calls. The compiler fails to clamp returndata from interface calls such as returns_int128() when those calls occur inside complex expressions, allowing out-of-range values to be interpreted as valid types. Exploitation requires a contract that makes the affected external call and a callee capable of returning out-of-bounds data; the resulting impact is incorrect contract behavior with confidentiality, integrity, and availability consequences described by the published CVSS assessments.
The record
- CVE
- CVE-2022-24845
- Published
- Apr 13, 2022
- Updated
- Apr 22, 2025
- Vendor
- Vyper
- Product
- Vyper
- Classifications
- CWE-190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 13, 2022CVE publishedPublication date reported by the CVE source.
- Apr 22, 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.
- Affected versionversion=< 0.3.2
What conditions does exploitation require?
What is affected?
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.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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