{"id":"CVE-2021-42765","aliases":["EUVD-2021-29723","GHSA-vvvf-733g-g5rv"],"status":"published","title":"The Proof-of-Stake (PoS) Ethereum consensus protocol through 2021-10-19 allows an adversary to...","description":"The Proof-of-Stake (PoS) Ethereum consensus protocol through 2021-10-19 allows an adversary to leverage network delay to cause a denial of service (indefinite stalling of consensus decisions).","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.00961,"percentile":0.6186,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2021-10-20T19:28:04Z","modified":"2026-06-17T04:10:06Z","products":[{"vendor":"proof-of-stake_ethereum_project","product":"proof-of-stake_ethereum"}],"references":[{"url":"https://arxiv.org/abs/2110.10086","tags":["x_refsource_MISC","x_transferred","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-42765"},{"url":"https://github.com/advisories/GHSA-vvvf-733g-g5rv"}],"sources":{"cve":[{"id":"CVE-2021-42765","description":"The Proof-of-Stake (PoS) Ethereum consensus protocol through 2021-10-19 allows an adversary to leverage network delay to cause a denial of service (indefinite stalling of consensus decisions).","status":"published","published":"2021-10-20T19:28:04Z","modified":"2024-08-04T03:38:50.171Z","updated_at":"2026-11-02T14:32:58.739039Z"}],"euvd":[{"id":"EUVD-2021-29723","description":"The Proof-of-Stake (PoS) Ethereum consensus protocol through 2021-10-19 allows an adversary to leverage network delay to cause a denial of service (indefinite stalling of consensus decisions).","status":"published","published":"2021-10-20T19:28:04Z","modified":"2024-08-04T03:38:50Z","updated_at":"2026-11-03T03:24:15.299027Z"}],"ghsa":[{"id":"GHSA-vvvf-733g-g5rv","title":"The Proof-of-Stake (PoS) Ethereum consensus protocol through 2021-10-19 allows an adversary to...","description":"The Proof-of-Stake (PoS) Ethereum consensus protocol through 2021-10-19 allows an adversary to leverage network delay to cause a denial of service (indefinite stalling of consensus decisions).","status":"published","published":"2022-05-24T19:18:03Z","modified":"2023-01-30T05:02:55Z","updated_at":"2026-11-02T14:46:44.129156Z"}],"nvd":[{"id":"CVE-2021-42765","description":"The Proof-of-Stake (PoS) Ethereum consensus protocol through 2021-10-19 allows an adversary to leverage network delay to cause a denial of service (indefinite stalling of consensus decisions).","status":"published","published":"2021-10-20T20:15:07.477Z","modified":"2026-06-17T04:10:06.377Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:07:00.137719Z"}]}}