Dashboard / CVE-2020-37289

CVE-2020-37289

MEDIUM
MEDIUM Priority: 0.02 BB Relevance: 73/100
Published: 2026-10-21 Modified: 2026-10-28 First seen: 2026-10-29 Status: active

Attack Surface

Network Low Complexity No Auth No Interaction

CVSS Vector Breakdown

AV: Network
AC: Low
PR: None
UI: None
AT: Present
VC: None
VI: Low
VA: None

Description

Vyper before 0.3.1 lacks a uint8 type, allowing interface return values declared as uint8, such as ERC20.decimals(), to be stored in uint256 variables without bounds checking. Malicious contracts can return values greater than 255 to manipulate or bypass contract logic that relies on these values.

Weakness Classification (1)

Affected Software (2)

VendorProductVersion
vyperlang vyper 0 < 0.3.1
vyperlang vyper 0 < 0.3.1

References & Advisories (2)

Bug Bounty Relevance

73 / 100
✓ Network accessible
✓ No authentication
✓ Low complexity
✓ No user interaction

CVSS Score

6.3 / 10.0 v4.0
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

EPSS — Exploitation Probability

0.26%
Raw Score 0.002610
Percentile 17.9%
Date 2026-10-29

Intelligence Sources

mitre ref →
nvd ref →

External Links