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CVE-2021-25835

22
FAUCET Score

CVE-2021-25835 describes a cross-chain transaction replay vulnerability affecting Cosmos Network Ethermint versions up to 0.4.0. Due to shared chainIDEpoch and signature schemes with Ethereum, a valid Ethereum transaction signature can be replayed on an Ethermint chain, leading to unauthorized transactions. This vulnerability carries a CVSSv3.1 score of 7.5 (High), indicating a network-based attack with low complexity that can result in high integrity impact. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 0.4.0CPE matchmatch criteria
cpe:2.3:a:chainsafe:ethermint:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.28%
Probability of exploitation in next 30 days
EPSS Percentile
67.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0128 is in the 47th percentile among its peer group of 51,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
gopatch availablevia ghsa
Product: github.com/cosmos/ethermintFixed in: 0.4.1

Vendor Advisories (1)

goGHSA-x5f3-qmwj-4f84high

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

Feb 15, 2022

References

github.com / cosmos/ethermint/issues/687
Third Party Advisory
github.com / cosmos/ethermint/pull/692
PatchThird Party Advisory