How severe is CVE-2018-17071?

CVE-2018-17071 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2018-17071 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-17071?

CVE-2018-17071 affects Lucky9 Lucky9io. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-17071?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2018-17071 published?

CVE-2018-17071 was published on 2018-09-18 and last updated on 2026-06-17.

CVE-2018-17071

CVE-2018-17071 is a high-severity vulnerability in Lucky9 Lucky9io with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-338.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (65th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-338
Affected product: Lucky9 Lucky9io
Published: 2018-09-18
Last modified: 2026-06-17

Description

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 allows attackers to always win and get rewards.

Frequently asked questions

What is CVE-2018-17071?: 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 allows attackers to always win and get rewards.
How severe is CVE-2018-17071?: CVE-2018-17071 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2018-17071 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-17071?: CVE-2018-17071 affects Lucky9 Lucky9io. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-17071?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2018-17071 published?: CVE-2018-17071 was published on 2018-09-18 and last updated on 2026-06-17.

References

https://github.com/TEAM-C4B/CVE-LIST/tree/master/CVE-2018-17071

Affected products (1)

cpe:2.3:a:lucky9:lucky9io:-:*:*:*:*:*:*:*

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