{"id":"CVE-2021-21777","aliases":["EUVD-2021-8949","GHSA-84vv-m336-cjrf"],"status":"published","title":"An information disclosure vulnerability exists in the Ethernet/IP UDP handler functionality of...","description":"An information disclosure vulnerability exists in the Ethernet/IP UDP handler functionality of EIP Stack Group OpENer 2.3 and development commit 8c73bf3. A specially crafted network request can lead to an out-of-bounds read.","severity":{"version":"3.0","score":8.6,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.01667,"percentile":0.76953,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-125"],"published":"2021-06-17T10:48:54Z","modified":"2026-10-24T10:30:34Z","products":[{"vendor":"opener_project","product":"opener"}],"references":[{"url":"https://talosintelligence.com/vulnerability_reports/TALOS-2021-1234","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory","evidence"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-21777"},{"url":"https://github.com/advisories/GHSA-84vv-m336-cjrf"}],"sources":{"cve":[{"id":"CVE-2021-21777","description":"An information disclosure vulnerability exists in the Ethernet/IP UDP handler functionality of EIP Stack Group OpENer 2.3 and development commit 8c73bf3. A specially crafted network request can lead to an out-of-bounds read.","status":"published","published":"2021-06-17T10:48:54Z","modified":"2024-08-03T18:23:29.512Z","cvss":[{"version":"3.0","score":8.6,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high","assessor":"cna"}],"updated_at":"2026-11-02T14:33:00.137099Z"}],"euvd":[{"id":"EUVD-2021-8949","description":"An information disclosure vulnerability exists in the Ethernet/IP UDP handler functionality of EIP Stack Group OpENer 2.3 and development commit 8c73bf3. A specially crafted network request can lead to an out-of-bounds read.","status":"published","published":"2021-06-17T10:48:54Z","modified":"2024-08-03T18:23:29Z","cvss":[{"version":"3.0","score":8.6,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-03T03:25:05.131984Z"}],"ghsa":[{"id":"GHSA-84vv-m336-cjrf","title":"An information disclosure vulnerability exists in the Ethernet/IP UDP handler functionality of...","description":"An information disclosure vulnerability exists in the Ethernet/IP UDP handler functionality of EIP Stack Group OpENer 2.3 and development commit 8c73bf3. A specially crafted network request can lead to an out-of-bounds read.","status":"published","published":"2022-05-24T19:05:37Z","modified":"2023-01-29T05:06:34Z","cvss":[{"version":"3.1","score":10,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:H","level":"critical"}],"cwes":["CWE-125"],"updated_at":"2026-11-02T14:46:03.455343Z"}],"nvd":[{"id":"CVE-2021-21777","description":"An information disclosure vulnerability exists in the Ethernet/IP UDP handler functionality of EIP Stack Group OpENer 2.3 and development commit 8c73bf3. A specially crafted network request can lead to an out-of-bounds read.","status":"published","published":"2021-06-17T11:15:07.707Z","modified":"2026-06-17T03:36:05.997Z","cvss":[{"version":"3.1","score":10,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:H","level":"critical","assessor":"primary"},{"version":"3.0","score":8.6,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high","assessor":"secondary"},{"version":"2.0","score":9.4,"vector":"AV:N/AC:L/Au:N/C:C/I:N/A:C","level":"high","assessor":"primary"}],"cwes":["CWE-125"],"updated_at":"2026-11-02T14:06:54.892562Z"}],"osv":[{"id":"CVE-2021-21777","description":"An information disclosure vulnerability exists in the Ethernet/IP UDP handler functionality of EIP Stack Group OpENer 2.3 and development commit 8c73bf3. A specially crafted network request can lead to an out-of-bounds read.","status":"published","published":"2021-06-17T11:15:07.707Z","modified":"2026-10-24T10:30:34.450778506Z","cvss":[{"version":"3.1","score":10,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:H","level":"critical"}],"updated_at":"2026-11-02T15:44:18.367807Z"}]}}