High severity7.5NVD Advisory· Published Jun 25, 2018· Updated Jun 17, 2026
CVE-2018-12703
CVE-2018-12703
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."
Affected products
1Patches
Vulnerability mechanics
References
2- peckshield.com/2018/06/23/evilReflex/nvdExploitThird Party Advisory
- huobiglobal.zendesk.com/hc/en-us/articles/360000110521-HADAX-Suspends-18T-and-GVE-Deposits-and-WithdrawalsnvdThird Party Advisory
News mentions
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