What is CVE-2018-17987?

CVE-2018-17987 is a high-severity vulnerability in Hashheroes, classified under Use of Insufficiently Random Values. CVSS score: 7.5/10. Published 2018-12-26.

How severe is CVE-2018-17987?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Hashheroes

CVE-2018-17987

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.

Published 2018-12-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.009 (59.0th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 59th percentile — 59.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Hashheroes

Weakness classification (CWE)

CWE-330 — Use of Insufficiently Random Values

References

github.com/TEAM-C4B/CVE-LIST/tree/master/CVE-2018-17987 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2018-17987?: CVE-2018-17987 is a high-severity vulnerability in Hashheroes, classified under Use of Insufficiently Random Values. CVSS score: 7.5/10. Published 2018-12-26.
How severe is CVE-2018-17987?: High severity. CVSS v3 base score is 7.5 out of 10.