CVE-2018-12454

HIGH

1000_guess - Predictable Random Number Generation in _addguess Function

Title source: llm

Description

The _addguess function of a simplelottery smart contract implementation for 1000 Guess, an Ethereum gambling game, generates a random value with publicly readable variables such as the current block information and a private variable (which can be read with a getStorageAt call). Therefore, it allows attackers to always win and get rewards.

References (1)

Core 1

Core References

Various Sources x_refsource_misc

https://medium.com/%40jonghyk.song/attack-on-pseudo-random-number-generator-prng-used-in-1000-guess-an-ethereum-lottery-game-7b76655f953d

Scores

CVSS v3 7.5

EPSS 0.0125

EPSS Percentile 65.5%

Attack Vector NETWORK

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Details

CWE

CWE-338

Status published

Products (1)

1000guess/1000_guess

Published Jun 17, 2018

Tracked Since Feb 18, 2026