Authentication bypass by capture-replay in github.com/cosmos/ethermint

HIGH 7.5CVE-2021-25835 · GHSA-x5f3-qmwj-4f84 · GO-2022-0889 · Published 08/02/2021 · updated 17/06/2026

In short

CVE-2021-25835 is a HIGH (CVSS 7.5) vulnerability affecting github.com/cosmos/ethermint, ethermint (chainsafe).
Chance of exploitation in the next 30 days (EPSS): 1.3%, higher than 71.0% of all vulnerabilities.
Fix: update to 0.4.1 or later.

Package	Affected versions	Patched versions
github.com/cosmos/ethermint Go	`< 0.4.1`	`0.4.1`
ethermint chainsafe	`≤ 0.4.0`	No fix yet

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.

Specific Go Packages Affected

github.com/cosmos/ethermint/rpc/namespaces/eth

NVD description

References

nvd.nist.gov/vuln/detail/CVE-2021-25835 · ADVISORY
cosmos/ethermint · WEB
cosmos/ethermint#692 · WEB
cosmos/ethermint release v0.4.1 · WEB
GitHub Advisory GHSA-x5f3-qmwj-4f84 · ADVISORY

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Package

Affected versions

Patched versions

github.com/cosmos/ethermint

< 0.4.1

0.4.1

ethermint

chainsafe

≤ 0.4.0

No fix yet

Description

Specific Go Packages Affected

github.com/cosmos/ethermint/rpc/namespaces/eth

NVD description