CVE-2021-25835: Chainsafe Ethermint

High severity, CVSS 7.5. EPSS: 1.3% chance of exploitation in the next 30 days.

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.

Affected products

• Chainsafe Ethermint: up to and including 0.4.0

Published 2021-02-08. Last modified 2026-06-17.