CVE-2021-25835

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-02-08 · updated 2026-06-17
Weakness: CWE-294

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.

Affected products

ChainSafe Ethermint: through 0.4.0

References

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

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