CVE-2018-12885

MediumCVSS 5.9/10Last modified Jun 17, 2026

Description

The randMod() function of the smart contract implementation for MyCryptoChamp, an Ethereum 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, attackers can get powerful champs/items and get rewards.

Metrics

CVSS 3.0 5.9/10CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Weakness enumeration

CWE-338

Affected software

Vendor	Product	Versions
n/a	n/a	n/a

References

https://etherscan.io/address/0x689FB61845488297dfE7586E5f7956475955d2DcThird Party Advisory
https://etherscan.io/address/0xa44e464b13280340904ffef0a65b8a0033460430Third Party Advisory
https://medium.com/coinmonks/get-legendary-items-by-breaking-pnrg-of-mycyptochamp-an-ethereum-online-game-cve-2018-12855-6e6beb41b8dfExploit, Third Party Advisory
https://etherscan.io/address/0x689FB61845488297dfE7586E5f7956475955d2DcThird Party Advisory
https://etherscan.io/address/0xa44e464b13280340904ffef0a65b8a0033460430Third Party Advisory
https://medium.com/coinmonks/get-legendary-items-by-breaking-pnrg-of-mycyptochamp-an-ethereum-online-game-cve-2018-12855-6e6beb41b8dfExploit, Third Party Advisory

Timeline

Published: Aug 7, 2018
Last modified: Jun 17, 2026
NVD status: Modified

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