CVE-2018-17071: The fallback function of a simple lottery smart contract implementation for Lucky9io, an Ethereum gambling gam

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HIGH 7.5REMOTEMITIGATE

CVE-2018-17071 is a high-severity flaw (CVSS 7.5) affecting lucky9io. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The fallback function of a simple lottery smart contract implementation for Lucky9io, an Ethereum gambling game, generates a random value with the publicly readable variable entry_number. This variable is private, yet it is readable by eth.getStorageAt function. Also, attackers can purchase a ticket at a low price by directly calling the fallback function with small msg.value, because the developer set the currency unit incorrectly. Therefore, it

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	1.2% (top 32%)
CISA exploited list	No
Weakness	CWE-338
Published	2018-09-18
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: lucky9

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

Am I affected?

Timeline

2018-09-18 21:29 UTCPublished CVE record published
2026-06-17 01:45 UTCUpdated Record last modified

lucky9 lucky9io 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 lucky9io || rpm -q lucky9io || lucky9io --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-2018-17071?

lucky9io: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-17071 being exploited?

CVE-2018-17071 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-2018-17071 affect?

CVE-2018-17071 affects lucky9io. Severity is high (CVSS 7.5). The fallback function of a simple lottery smart contract implementation for Lucky9io, an Ethereum gambling game, generates a random value with the publicly readable variable entry_number. This variable is private, yet it is readable by eth.

How urgent is CVE-2018-17071?

Priority 53/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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