CVE-2021-42766

9.1 criticalEPSS 1.0%

Critical (9.1) in proof-of-stake ethereum project proof-of-stake ethereum. EPSS 1.0% chance of exploitation in the next 30 days.

The Proof-of-Stake (PoS) Ethereum consensus protocol through 2021-10-19 allows an adversary to cause a denial of service (long-range consensus chain reorganizations), even when this adversary has little stake and cannot influence network message propagation. This can cause a protocol stall, or an increase in the profits of individual validators.

Severity

CVSS 3.1

9.1 critical

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

EPSS: 1.0% chance of exploitation in the next 30 days; higher than 61% of CVEs (scores of 2026-10-31)
Published: 2021-10-20
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

proof-of-stake_ethereum_project:proof-of-stake_ethereum

References

https://arxiv.org/abs/2110.10086
https://arxiv.org/abs/2110.10086

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