CVE-2018-17071 json
The fallback function of a simple lottery smart contract implementation for Lucky9io, an Ethereum gambling game, generates a random value w…
published 2018-09-18 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-8852
- cvss
- 7.5
- version 3.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.2%
- EPSS 1.2% chance of exploitation in 30 days, percentile 68%
- public exploits
- 0
- none known
Summary
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.
Exploit prediction
1.21% chance of exploitation in the next 30 days, higher than 68% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/TEAM-C4B/CVE-LIST/tree/master/CVE-2018-17071 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.0 | 7.5 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:P/I:N/A:N |
Classification
- Weakness
-
- CWE-338 Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
References
-
github.com
/TEAM-C4B/CVE-LIST/tree/master/CVE-2018-17071
exploit, third-party-advisory
Sources
- CVE List CVE-2018-17071
- NVD CVE-2018-17071
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