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

published 2021-02-08 5 y ago modified 2026-06-17 4 mo ago also GHSA-x5f3-qmwj-4f84 , GO-2022-0889 , EUVD-2022-1247

cvss: 7.5; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.3%; EPSS 1.3% chance of exploitation in 30 days, percentile 71%
public exploits: 0; none known

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.

Patch / fix

fixed in 1 links 2

go github.com/cosmos/ethermint 0.4.1

github.com/cosmos/ethermint#692 pull request
github.com/cosmos/ethermint/releases/tag/v0.4.1 release

Exploit prediction

1.32% chance of exploitation in the next 30 days, higher than 71% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:N/I:P/A:N
GitHub	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected packages

ecosystem	package	affected	fixed in
go	github.com/cosmos/ethermint	<0.4.1	0.4.1

Classification

Weakness

CWE-294 Authentication Bypass by Capture-replay
CWE-295 Improper Certificate Validation

References

github.com /cosmos/ethermint/pull/692
web, patch, third-party-advisory
github.com /cosmos/ethermint/issues/687
web, third-party-advisory, report
nvd.nist.gov /vuln/detail/CVE-2021-25835
advisory
github.com /cosmos/ethermint/releases/tag/v0.4.1
web
github.com /advisories/GHSA-x5f3-qmwj-4f84
advisory

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary