CVE-2021-25835

Name: CVE-2021-25835
Creator: NVD / NIST
Published: 2021-02-08T18:15:13.803+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.28%

Last modified Jun 17, 2026

CVE-2021-25835 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 1.28% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS Probability

1.28%

66.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-294

Affected Software

Vendor	Product	Versions
Chainsafe	Ethermint	<= 0.4.0

References

https://github.com/cosmos/ethermint/issues/687Third Party Advisory
https://github.com/cosmos/ethermint/pull/692Patch, Third Party Advisory
https://github.com/cosmos/ethermint/issues/687Third Party Advisory
https://github.com/cosmos/ethermint/pull/692Patch, Third Party Advisory

Timeline

Published: Feb 8, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-25835?

How severe is CVE-2021-25835?

CVE-2021-25835 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.28% probability of exploitation in the next 30 days.

How do I fix CVE-2021-25835?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-25835?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST