How severe is CVE-2021-25837?

CVE-2021-25837 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-2021-25837 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-25837?

CVE-2021-25837 affects Chainsafe Ethermint. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-25837?

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-2021-25837 published?

CVE-2021-25837 was published on 2021-02-08 and last updated on 2026-06-17.

CVE-2021-25837

CVE-2021-25837 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.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (72nd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Chainsafe Ethermint
Published: 2021-02-08
Last modified: 2026-06-17

Description

Cosmos Network Ethermint <= v0.4.0 is affected by cache lifecycle inconsistency in the EVM module. Due to the inconsistency between the Storage caching cycle and the Tx processing cycle, Storage changes caused by a failed transaction are improperly reserved in memory. Although the bad storage cache data will be discarded at EndBlock, it is still valid in the current block, which enables many possible attacks such as an "arbitrary mint token".

Frequently asked questions

What is CVE-2021-25837?: Cosmos Network Ethermint <= v0.4.0 is affected by cache lifecycle inconsistency in the EVM module. Due to the inconsistency between the Storage caching cycle and the Tx processing cycle, Storage changes caused by a failed transaction are improperly reserved in memory. Although the bad storage cache data will be discarded at EndBlock, it is still valid in the current block, which enables many possible attacks such as an "arbitrary mint token".
How severe is CVE-2021-25837?: CVE-2021-25837 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-2021-25837 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-25837?: CVE-2021-25837 affects Chainsafe Ethermint. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-25837?: 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-2021-25837 published?: CVE-2021-25837 was published on 2021-02-08 and last updated on 2026-06-17.

References

https://github.com/cosmos/ethermint/issues/667#issuecomment-759284107

Affected products (1)

cpe:2.3:a:chainsafe:ethermint:*:*:*:*:*:*:*:*

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