CVE-2018-17987: The determineWinner function of a smart contract implementation for HashHeroes Tiles, an Ethereum game, uses a

This week

HIGH 7.5REMOTEMITIGATE

CVE-2018-17987 is a high-severity flaw (CVSS 7.5) affecting hashheroes. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.9% (top 40%)
CISA exploited list	No
Weakness	CWE-330
Published	2018-12-26
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: hashheroes

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2018-12-26 21:29 UTCPublished CVE record published
2026-06-17 01:46 UTCUpdated Record last modified

hashheroes hashheroes MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy hashheroes || rpm -q hashheroes || hashheroes --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2018-17987?

hashheroes: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-17987 being exploited?

CVE-2018-17987 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2018-17987 affect?

CVE-2018-17987 affects hashheroes. Severity is high (CVSS 7.5). 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 pu

How urgent is CVE-2018-17987?

Priority 51/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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