CVE-2018-13203 json
The sellBuyerTokens function of a smart contract implementation for SwapToken, an Ethereum token, has an integer overflow in which "amount…
published 2018-07-05 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-5152
- cvss
- 7.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.0%
- EPSS 1.0% chance of exploitation in 30 days, percentile 63%
- public exploits
- 0
- none known
Summary
The sellBuyerTokens function of a smart contract implementation for SwapToken, an Ethereum token, has an integer overflow in which "amount * sellPrice" can be zero, consequently reducing a seller's assets.
Exploit prediction
1.01% chance of exploitation in the next 30 days, higher than 63% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:N/I:P/A:N |
Classification
- Weakness
-
- CWE-190 Integer Overflow or Wraparound
References
-
github.com
/BlockChainsSecurity/EtherTokens/tree/master/SwapToken
third-party-advisory
-
github.com
/BlockChainsSecurity/EtherTokens/blob/master/ETHEREUMBLACK/sell%20integer%20overflow.md
third-party-advisory
Sources
- CVE List CVE-2018-13203
- NVD CVE-2018-13203
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