{"id":"CVE-2021-27500","aliases":["EUVD-2021-14254","GHSA-v2cq-8xv3-3vq4"],"status":"published","title":"EIPStackGroup OpENer Ethernet/IP Reachable Assertion","description":"A specifically crafted packet sent by an attacker to EIPStackGroup OpENer EtherNet/IP commits and versions prior to Feb 10, 2021 may result in a denial-of-service condition.","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":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.01309,"percentile":0.71029,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-617"],"published":"2022-05-12T19:20:00Z","modified":"2026-10-20T10:47:52Z","products":[{"vendor":"eipstackgroup","product":"opener ethernet/ip"},{"vendor":"opener_project","product":"opener"}],"references":[{"url":"https://www.cisa.gov/uscert/ics/advisories/icsa-21-105-02","tags":["x_refsource_CONFIRM","x_transferred","Third Party Advisory","US Government Resource","advisory"]},{"url":"https://github.com/EIPStackGroup/OpENer","tags":["x_refsource_CONFIRM","x_transferred","Third Party Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-27500"},{"url":"https://github.com/advisories/GHSA-v2cq-8xv3-3vq4"}],"sources":{"cve":[{"id":"CVE-2021-27500","title":"EIPStackGroup OpENer Ethernet/IP Reachable Assertion","description":"A specifically crafted packet sent by an attacker to EIPStackGroup OpENer EtherNet/IP commits and versions prior to Feb 10, 2021 may result in a denial-of-service condition.","status":"published","published":"2022-05-12T19:20:00Z","modified":"2025-04-16T16:22:11.255Z","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":"cna"}],"cwes":["CWE-617"],"updated_at":"2026-11-02T14:33:04.679189Z"}],"euvd":[{"id":"EUVD-2021-14254","description":"A specifically crafted packet sent by an attacker to EIPStackGroup OpENer EtherNet/IP commits and versions prior to Feb 10, 2021 may result in a denial-of-service condition.","status":"published","published":"2022-05-12T19:20:00Z","modified":"2025-04-16T16:22:11Z","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":"2026-11-02T20:52:24.329168Z"}],"ghsa":[{"id":"GHSA-v2cq-8xv3-3vq4","title":"A specifically crafted packet sent by an attacker to EIPStackGroup OpENer EtherNet/IP commits and...","description":"A specifically crafted packet sent by an attacker to EIPStackGroup OpENer EtherNet/IP commits and versions prior to Feb 10, 2021 may result in a denial-of-service condition.","status":"published","published":"2022-05-13T00:00:29Z","modified":"2023-02-01T05:02:23Z","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"}],"cwes":["CWE-617"],"updated_at":"2026-11-02T14:49:53.83549Z"}],"nvd":[{"id":"CVE-2021-27500","description":"A specifically crafted packet sent by an attacker to EIPStackGroup OpENer EtherNet/IP commits and versions prior to Feb 10, 2021 may result in a denial-of-service condition.","status":"published","published":"2022-05-12T20:15:13.92Z","modified":"2026-06-17T03:44:59.147Z","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":"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-617"],"updated_at":"2026-11-02T14:07:06.029737Z"}],"osv":[{"id":"CVE-2021-27500","description":"A specifically crafted packet sent by an attacker to EIPStackGroup OpENer EtherNet/IP commits and versions prior to Feb 10, 2021 may result in a denial-of-service condition.","status":"published","published":"2022-05-12T20:15:13.92Z","modified":"2026-10-20T10:47:52.472862693Z","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":"2026-11-02T15:44:19.129331Z"}]}}