CVE-2021-25835: Cosmos Network Ethermint <= v0.4.0 is affected by a cross-chain transaction replay vulnerability in the EVM mo

Q: How do I fix CVE-2021-25835?

ethermint: upgrade to newer than 0.4.0. Exact commands for each OS are on this page.

Q: Is CVE-2021-25835 being exploited?

CVE-2021-25835 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-25835 affect?

CVE-2021-25835 affects ethermint. Severity is high (CVSS 7.5). 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 et

Q: How urgent is CVE-2021-25835?

Priority 49/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADE

CVE-2021-25835 is a high-severity flaw (CVSS 7.5) affecting ethermint. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.3% (top 29%)
CISA exploited list	No
Weakness	CWE-294
Published	2021-02-08
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: chainsafe

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-02-08 18:15 UTCPublished CVE record published
2026-06-17 03:42 UTCUpdated Record last modified

chainsafe ethermint UPGRADE

Affected: <= 0.4.0

Fixed in: newer than 0.4.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy ethermint || rpm -q ethermint || ethermint --version

2. UPGRADE to newer than 0.4.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade ethermint

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ethermint

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-25835?

ethermint: upgrade to newer than 0.4.0. Exact commands for each OS are on this page.

Is CVE-2021-25835 being exploited?

CVE-2021-25835 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-25835 affect?

CVE-2021-25835 affects ethermint. Severity is high (CVSS 7.5). 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 et

How urgent is CVE-2021-25835?

Priority 49/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2022-35936 HIGH 8.2 UPGRADE UPGRADE Ethermint is an Ethereum library
CVE-2021-43839 HIGH 7.5 UPGRADE UPGRADE Cronos is a commercial implementation of a blockchain
CVE-2021-25837 HIGH 7.5 UPGRADE Cosmos Network Ethermint <= v0.4.0 is affected by cache lifecycle inconsistency in the EVM module
CVE-2021-25836 HIGH 7.5 UPGRADE Cosmos Network Ethermint <= v0.4.0 is affected by cache lifecycle inconsistency in the EVM module
CVE-2021-25834 HIGH 7.5 UPGRADE Cosmos Network Ethermint <= v0.4.0 is affected by a transaction replay vulnerability in the EVM module

References

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