What’s Vulnerable › Vulnerabilities

CVE-2018-13221

• Severity: high (CVSS 7.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-07-05 · updated 2026-06-17
• Weakness: CWE-190

Description

The sell function of a smart contract implementation for Extreme Coin (XT) (Contract Name: ExtremeToken), an Ethereum token, has an integer overflow in which "amount * sellPrice" can be zero, consequently reducing a seller's assets.

Affected products

• Extreme Coin Project Extreme Coin: all versions

References

• https://github.com/BlockChainsSecurity/EtherTokens/blob/master/ETHEREUMBLACK/sell%20integer%20overflow.md
• https://github.com/BlockChainsSecurity/EtherTokens/tree/master/ExtremeToken
• https://github.com/BlockChainsSecurity/EtherTokens/blob/master/ETHEREUMBLACK/sell%20integer%20overflow.md
• https://github.com/BlockChainsSecurity/EtherTokens/tree/master/ExtremeToken

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