CVE-2018-12703

HIGH

Block 18 - Unverified Callcode Execution in approveAndCallcode Function

Title source: llm
STIX 2.1

Description

The approveAndCallcode function of a smart contract implementation for Block 18 (18T), an tradable Ethereum ERC20 token, allows attackers to steal assets (e.g., transfer the contract's balances into their account) because the callcode (i.e., _spender.call(_extraData)) is not verified, aka the "evilReflex" issue. NOTE: a PeckShield disclosure states "some researchers have independently discussed the mechanism of such vulnerability."

References (2)

Core 2

Scores

CVSS v3 7.5
EPSS 0.0109
EPSS Percentile 61.4%
Attack Vector NETWORK
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Details

CWE
CWE-20
Status published
Products (1)
block18/block18
Published Jun 25, 2018
Tracked Since Feb 18, 2026