{"id":"CVE-2021-39137","aliases":["EUVD-2021-1653","GHSA-9856-9gg9-qcmq","GO-2022-0254"],"status":"published","title":"Consensus flaw during block processing in go-ethereum","description":"go-ethereum is the official Go implementation of the Ethereum protocol. In affected versions a consensus-vulnerability in go-ethereum (Geth) could cause a chain split, where vulnerable versions refuse to accept the canonical chain. Further details about the vulnerability will be disclosed at a later date. A patch is included in the upcoming `v1.10.8` release. No workaround are available.","severity":{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.01325,"percentile":0.71336,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-436"],"published":"2021-08-24T16:05:10Z","modified":"2026-10-20T10:54:52Z","fixes":[{"ecosystem":"Go","package":"github.com/ethereum/go-ethereum","fixed_in":["1.10.8"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Go","package":"github.com/ethereum/go-ethereum","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.10.0"},{"fixed":"1.10.8"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/ethereum/go-ethereum","ranges":[{"type":"SEMVER","events":[{"introduced":"1.10.0"},{"fixed":"1.10.8"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/ethereum/go-ethereum","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.10.8"}]}]}],"products":[{"vendor":"ethereum","product":"go-ethereum"},{"vendor":"ethereum","product":"go_ethereum"}],"references":[{"url":"https://github.com/ethereum/go-ethereum/security/advisories/GHSA-9856-9gg9-qcmq","tags":["x_refsource_CONFIRM","x_transferred","Third Party Advisory","advisory","web"]},{"url":"https://github.com/ethereum/go-ethereum/releases/tag/v1.10.8","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-39137","tags":["advisory"]},{"url":"https://github.com/ethereum/go-ethereum/pull/23381/commits/4d4879cafd1b3c906fc184a8c4a357137465128f","tags":["web","fix"]},{"url":"https://pkg.go.dev/vuln/GO-2022-0254","tags":["web"]},{"url":"https://github.com/advisories/GHSA-9856-9gg9-qcmq"},{"url":"https://github.com/ethereum/go-ethereum","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2021-39137","title":"Consensus flaw during block processing in go-ethereum","description":"go-ethereum is the official Go implementation of the Ethereum protocol. In affected versions a consensus-vulnerability in go-ethereum (Geth) could cause a chain split, where vulnerable versions refuse to accept the canonical chain. Further details about the vulnerability will be disclosed at a later date. A patch is included in the upcoming `v1.10.8` release. No workaround are available.","status":"published","published":"2021-08-24T16:05:10Z","modified":"2024-08-04T01:58:17.913Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna"}],"cwes":["CWE-436"],"updated_at":"2026-11-02T14:33:09.540052Z"}],"euvd":[{"id":"EUVD-2021-1653","description":"go-ethereum is the official Go implementation of the Ethereum protocol. In affected versions a consensus-vulnerability in go-ethereum (Geth) could cause a chain split, where vulnerable versions refuse to accept the canonical chain. Further details about the vulnerability will be disclosed at a later date. A patch is included in the upcoming `v1.10.8` release. No workaround are available.","status":"published","published":"2021-08-24T16:05:10Z","modified":"2024-08-04T01:58:17Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-03T03:24:24.305495Z"}],"ghsa":[{"id":"GHSA-9856-9gg9-qcmq","title":"Ethereum Contains Consensus Flaw During Block Processing","description":"### Impact\n\nA vulnerability in the Geth EVM could cause a node to reject the canonical chain. \n\n### Description \n\nA memory-corruption bug within the EVM can cause a consensus error, where vulnerable nodes obtain a different `stateRoot` when processing a maliciously crafted transaction. This, in turn, would lead to the chain being split in two forks.\n\nAll Geth versions supporting the London hard fork are vulnerable (which predates London), so all users should update.\n\nThis bug was exploited on Mainnet at block 13107518, leading to a minority chain split. \n\n### Patches\n\nA patch is included in the `v1.10.8` release.\nThe exact patch to fix the issue is contained within this [commit](https://github.com/ethereum/go-ethereum/pull/23381/commits/4d4879cafd1b3c906fc184a8c4a357137465128f)\n\n### Workarounds\n\nNo workarounds exist, save to update and/or apply the patch commit. \n\n### References. \n\nPost-mortem [write-up](https://github.com/ethereum/go-ethereum/blob/master/docs/postmortems/2021-08-22-split-postmortem.md).\n\n### Credits\n\nThe bug was found by @guidovranken (working for [Sentnl](https://sentnl.io/) during an audit of the [Telos EVM](https://www.telos.net/evm)) and reported via bounty@ethereum.org.\n\n### For more information\nIf you have any questions or comments about this advisory:\n\n* Open an issue in [go-ethereum](https://github.com/ethereum/go-ethereum/)\n* Email us at [security@ethereum.org](mailto:security@ethereum.org)\n","status":"published","published":"2021-08-30T16:15:41Z","modified":"2023-08-29T18:53:27Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-436"],"updated_at":"2026-11-02T14:37:01.345964Z"}],"nvd":[{"id":"CVE-2021-39137","description":"go-ethereum is the official Go implementation of the Ethereum protocol. In affected versions a consensus-vulnerability in go-ethereum (Geth) could cause a chain split, where vulnerable versions refuse to accept the canonical chain. Further details about the vulnerability will be disclosed at a later date. A patch is included in the upcoming `v1.10.8` release. No workaround are available.","status":"published","published":"2021-08-24T16:15:11.007Z","modified":"2026-06-17T04:03:08.417Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"},{"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"}],"cwes":["CWE-436"],"updated_at":"2026-11-02T14:06:57.318236Z"}],"osv":[{"id":"CVE-2021-39137","description":"go-ethereum is the official Go implementation of the Ethereum protocol. In affected versions a consensus-vulnerability in go-ethereum (Geth) could cause a chain split, where vulnerable versions refuse to accept the canonical chain. Further details about the vulnerability will be disclosed at a later date. A patch is included in the upcoming `v1.10.8` release. No workaround are available.","status":"published","published":"2021-08-24T16:15:11.007Z","modified":"2026-10-20T10:54:52.832664414Z","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"}],"updated_at":"2026-11-02T15:44:20.843843Z"},{"id":"GHSA-9856-9gg9-qcmq","title":"Ethereum Contains Consensus Flaw During Block Processing","description":"### Impact\n\nA vulnerability in the Geth EVM could cause a node to reject the canonical chain. \n\n### Description \n\nA memory-corruption bug within the EVM can cause a consensus error, where vulnerable nodes obtain a different `stateRoot` when processing a maliciously crafted transaction. This, in turn, would lead to the chain being split in two forks.\n\nAll Geth versions supporting the London hard fork are vulnerable (which predates London), so all users should update.\n\nThis bug was exploited on Mainnet at block 13107518, leading to a minority chain split. \n\n### Patches\n\nA patch is included in the `v1.10.8` release.\nThe exact patch to fix the issue is contained within this [commit](https://github.com/ethereum/go-ethereum/pull/23381/commits/4d4879cafd1b3c906fc184a8c4a357137465128f)\n\n### Workarounds\n\nNo workarounds exist, save to update and/or apply the patch commit. \n\n### References. \n\nPost-mortem [write-up](https://github.com/ethereum/go-ethereum/blob/master/docs/postmortems/2021-08-22-split-postmortem.md).\n\n### Credits\n\nThe bug was found by @guidovranken (working for [Sentnl](https://sentnl.io/) during an audit of the [Telos EVM](https://www.telos.net/evm)) and reported via bounty@ethereum.org.\n\n### For more information\nIf you have any questions or comments about this advisory:\n\n* Open an issue in [go-ethereum](https://github.com/ethereum/go-ethereum/)\n* Email us at [security@ethereum.org](mailto:security@ethereum.org)\n","status":"published","published":"2021-08-30T16:15:41Z","modified":"2026-07-08T06:29:39.134531916Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-436"],"updated_at":"2026-11-02T15:46:43.524801Z"},{"id":"GO-2022-0254","title":"Consensus flaw during block processing in github.com/ethereum/go-ethereum","description":"A vulnerability in the Geth EVM can cause a node to reject the canonical chain.\n\nA memory-corruption bug within the EVM can cause a consensus error, where vulnerable nodes obtain a different stateRoot when processing a maliciously crafted transaction. This, in turn, would lead to the chain being split in two forks.","status":"published","published":"2022-07-15T23:07:56Z","modified":"2024-05-20T16:03:47Z","updated_at":"2026-11-02T15:47:00.604718Z"}]}}