CVE-2021-25835
CVE-2021-25835 is a high-severity vulnerability in Chainsafe Ethermint with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-294.
Key facts
- Severity: High (CVSS 3.x base score 7.5)
- CVSS v2: 5.0
- EPSS exploit prediction: 1% (67th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-294
- Affected product: Chainsafe Ethermint
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2021-25835?
- 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.
- How severe is CVE-2021-25835?
- CVE-2021-25835 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
- Is CVE-2021-25835 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (67th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-25835?
- CVE-2021-25835 affects Chainsafe Ethermint. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2021-25835?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2021-25835 published?
- CVE-2021-25835 was published on 2021-02-08 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:chainsafe:ethermint:*:*:*:*:*:*:*:*
More vulnerabilities in Chainsafe Ethermint
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