{"id":"CVE-2020-11637","aliases":["EUVD-2020-3982","GHSA-7j7h-vfmh-v8jc"],"status":"published","title":"Automation Runtime TFTP Service DoS Vulnerability","description":"A memory leak in the TFTP service in B\u0026R Automation Runtime versions \u003cN4.26, \u003cN4.34, \u003cF4.45, \u003cE4.53, \u003cD4.63, \u003cA4.73 and prior could allow an unauthenticated attacker with network access to cause a denial of service (DoS) condition.","severity":{"version":"3.1","score":5.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.01092,"percentile":0.65693,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-401","CWE-772"],"published":"2020-10-15T15:08:14Z","modified":"2026-06-17T02:50:31Z","products":[{"vendor":"b\u0026r","product":"automation runtime"},{"vendor":"b\u0026r industrial automation gmbh","product":"automation runtime"},{"vendor":"br-automation","product":"automation_runtime"}],"references":[{"url":"https://www.br-automation.com/downloads_br_productcatalogue/assets/1595163815396-de-original-1.0.pdf","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-11637"},{"url":"https://github.com/advisories/GHSA-7j7h-vfmh-v8jc"}],"sources":{"cve":[{"id":"CVE-2020-11637","title":"Automation Runtime TFTP Service DoS Vulnerability","description":"A memory leak in the TFTP service in B\u0026R Automation Runtime versions \u003cN4.26, \u003cN4.34, \u003cF4.45, \u003cE4.53, \u003cD4.63, \u003cA4.73 and prior could allow an unauthenticated attacker with network access to cause a denial of service (DoS) condition.","status":"published","published":"2020-10-15T15:08:14.438Z","modified":"2024-09-16T16:33:01.394Z","cvss":[{"version":"3.1","score":5.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L","level":"medium","assessor":"cna"}],"cwes":["CWE-401"],"updated_at":"2026-11-02T14:35:57.67317Z"}],"euvd":[{"id":"EUVD-2020-3982","description":"A memory leak in the TFTP service in B\u0026R Automation Runtime versions \u003cN4.26, \u003cN4.34, \u003cF4.45, \u003cE4.53, \u003cD4.63, \u003cA4.73 and prior could allow an unauthenticated attacker with network access to cause a denial of service (DoS) condition.","status":"published","published":"2020-10-15T15:08:14Z","modified":"2024-09-16T16:33:01Z","cvss":[{"version":"3.1","score":5.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-03T00:55:50.59293Z"}],"ghsa":[{"id":"GHSA-7j7h-vfmh-v8jc","title":"A memory leak in the TFTP service in B\u0026R Automation Runtime versions \u003cN4.26, \u003cN4.34, \u003cF4.45, \u003cE4...","description":"A memory leak in the TFTP service in B\u0026R Automation Runtime versions \u003cN4.26, \u003cN4.34, \u003cF4.45, \u003cE4.53, \u003cD4.63, \u003cA4.73 and prior could allow an unauthenticated attacker with network access to cause a denial of service (DoS) condition.","status":"published","published":"2022-05-24T17:30:43Z","modified":"2023-01-29T05:04:19Z","cwes":["CWE-401","CWE-772"],"updated_at":"2026-11-02T14:45:31.69314Z"}],"nvd":[{"id":"CVE-2020-11637","description":"A memory leak in the TFTP service in B\u0026R Automation Runtime versions \u003cN4.26, \u003cN4.34, \u003cF4.45, \u003cE4.53, \u003cD4.63, \u003cA4.73 and prior could allow an unauthenticated attacker with network access to cause a denial of service (DoS) condition.","status":"published","published":"2020-10-15T16:15:11.773Z","modified":"2026-06-17T02:50:31.823Z","cvss":[{"version":"3.1","score":5.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L","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-401"],"updated_at":"2026-11-02T14:06:19.351389Z"}]}}