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CVE-2023-46247

7.5 · HIGH

Vyper is a Pythonic Smart Contract Language for the Ethereum Virtual Machine (EVM).

Published Dec 13, 2023CWE-193EPSS 0.70%

Overview

CVE-2023-46247 is a high-severity vulnerability. It was published on December 13, 2023 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Vyper is a Pythonic Smart Contract Language for the Ethereum Virtual Machine (EVM). Contracts containing large arrays might underallocate the number of slots they need by 1. Prior to v0.3.8, the calculation to determine how many slots a storage variable needed used `math.ceil(type_.size_in_bytes / 32)`. The intermediate floating point step can produce a rounding error if there are enough bits set in the IEEE-754 mantissa. Roughly speaking, if `type_.size_in_bytes` is large (> 2**46), and slightly less than a power of 2, the calculation can overestimate how many slots are needed by 1. If `type_.size_in_bytes` is slightly more than a power of 2, the calculation can underestimate how many slots are needed by 1. This issue is patched in version 0.3.8.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/vyperlang/vyper/blob/6020b8bbf66b062d299d87bc7e4eddc4c9d1c157/vyper/semantics/validation/data_positions.py#L197GitHubgithub.com/vyperlang/vyper/commit/0bb7203b584e771b23536ba065a6efda457161bbGitHubgithub.com/vyperlang/vyper/security/advisories/GHSA-6m97-7527-mh74GitHubgithub.com/vyperlang/vyper/blob/6020b8bbf66b062d299d87bc7e4eddc4c9d1c157/vyper/semantics/validation/data_positions.py#L197GitHubgithub.com/vyperlang/vyper/commit/0bb7203b584e771b23536ba065a6efda457161bbGitHubgithub.com/vyperlang/vyper/security/advisories/GHSA-6m97-7527-mh74

How CyberStrike helps

Frequently asked questions

What is CVE-2023-46247?

CVE-2023-46247 is a high-severity vulnerability. It was published on December 13, 2023 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2023-46247?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2023-46247?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2023-46247?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-46247 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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