CVE-2018-17987: Hashheroes

High severity, CVSS 7.5. EPSS: 0.9% chance of exploitation in the next 30 days.

The determineWinner function of a smart contract implementation for HashHeroes Tiles, an Ethereum game, uses a certain blockhash value in an attempt to generate a random number for the case where NUM_TILES equals the number of people who purchased a tile, which allows an attacker to control the awarding of the prize by being the last person to purchase a tile.

Affected products

• Hashheroes Hashheroes: affected versions not specified

Published 2018-12-26. Last modified 2026-06-17.