{"id":"CVE-2021-20988","aliases":["EUVD-2021-8397","GHSA-473m-ppf7-95wq"],"status":"published","title":"Hilscher rcX RTOS: Wrong handling of the UDP checksum","description":"In Hilscher rcX RTOS versions prios to V2.1.14.1 the actual UDP packet length is not verified against the length indicated by the packet. This may lead to a denial of service of the affected device.","severity":{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.0099,"percentile":0.62945,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-119"],"published":"2021-05-13T13:45:24Z","modified":"2026-06-17T03:34:36Z","products":[{"vendor":"hilscher","product":"rcx rtos"},{"vendor":"hilscher","product":"rcx_rtos"},{"vendor":"pepperl+fuchs","product":"ethernet io modules ice1-16"},{"vendor":"pepperl+fuchs","product":"ethernet io modules ice1-8"},{"vendor":"pepperl-fuchs","product":"ice1-16di-g60l-v1d_firmware"},{"vendor":"pepperl-fuchs","product":"ice1-16dio-g60l-c1-v1d_firmware"},{"vendor":"pepperl-fuchs","product":"ice1-16dio-g60l-v1d_firmware"},{"vendor":"pepperl-fuchs","product":"ice1-8di8do-g60l-c1-v1d_firmware"},{"vendor":"pepperl-fuchs","product":"ice1-8di8do-g60l-v1d_firmware"},{"vendor":"pepperl-fuchs","product":"ice1-8iol-g30l-v1d_firmware"},{"vendor":"pepperl-fuchs","product":"ice1-8iol-g60l-v1d_firmware"},{"vendor":"pepperl-fuchs","product":"ice1-8iol-s2-g60l-v1d_firmware"}],"references":[{"url":"https://kb.hilscher.com/display/ISMS/2019-04-10+Wrong+handling+of+the+UDP+checksum","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory"]},{"url":"https://cert.vde.com/de-de/advisories/vde-2021-018","tags":["x_refsource_CONFIRM","x_transferred","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-20988"},{"url":"https://github.com/advisories/GHSA-473m-ppf7-95wq"}],"sources":{"cve":[{"id":"CVE-2021-20988","title":"Hilscher rcX RTOS: Wrong handling of the UDP checksum","description":"In Hilscher rcX RTOS versions prios to V2.1.14.1 the actual UDP packet length is not verified against the length indicated by the packet. This may lead to a denial of service of the affected device.","status":"published","published":"2021-05-13T13:45:24.41Z","modified":"2024-09-16T17:49:09.628Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-119"],"updated_at":"2026-11-02T14:32:55.564736Z"}],"euvd":[{"id":"EUVD-2021-8397","description":"In Hilscher rcX RTOS versions prios to V2.1.14.1 the actual UDP packet length is not verified against the length indicated by the packet. This may lead to a denial of service of the affected device.","status":"published","published":"2021-05-13T13:45:24Z","modified":"2024-09-16T17:49:09Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-03T00:55:38.288771Z"}],"ghsa":[{"id":"GHSA-473m-ppf7-95wq","title":"In Hilscher rcX RTOS versions prios to V2.1.14.1 the actual UDP packet length is not verified...","description":"In Hilscher rcX RTOS versions prios to V2.1.14.1 the actual UDP packet length is not verified against the length indicated by the packet. This may lead to a denial of service of the affected device.","status":"published","published":"2022-05-24T19:02:22Z","modified":"2023-01-29T05:06:41Z","cwes":["CWE-119"],"updated_at":"2026-11-02T14:46:04.961867Z"}],"nvd":[{"id":"CVE-2021-20988","description":"In Hilscher rcX RTOS versions prios to V2.1.14.1 the actual UDP packet length is not verified against the length indicated by the packet. This may lead to a denial of service of the affected device.","status":"published","published":"2021-05-13T14:15:17.897Z","modified":"2026-06-17T03:34:36.317Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/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-119"],"updated_at":"2026-11-02T14:06:53.343329Z"}]}}