{"id":"CVE-2019-12656","aliases":["EUVD-2019-4247","GHSA-6r46-67j7-hr8v"],"status":"published","title":"Cisco IOx Application Environment Denial of Service Vulnerability","description":"A vulnerability in the IOx application environment of multiple Cisco platforms could allow an unauthenticated, remote attacker to cause the IOx web server to stop processing HTTPS requests, resulting in a denial of service (DoS) condition. The vulnerability is due to a Transport Layer Security (TLS) implementation issue. An attacker could exploit this vulnerability by sending crafted TLS packets to the IOx web server on an affected device. A successful exploit could allow the attacker to cause the IOx web server to stop processing HTTPS requests, resulting in a DoS condition.","severity":{"version":"3.0","score":7.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.01824,"percentile":0.78974,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-20"],"published":"2019-09-25T20:16:01Z","modified":"2026-06-17T02:15:09Z","products":[{"vendor":"cisco","product":"cgr_1000_firmware"},{"vendor":"cisco","product":"cisco industrial routers operating system software"},{"vendor":"cisco","product":"ic3000_firmware"},{"vendor":"cisco","product":"ie_4000_firmware"},{"vendor":"cisco","product":"industrial_ethernet_2000_series_firmware"},{"vendor":"cisco","product":"ios"},{"vendor":"cisco","product":"ir510_wpan_firmware"}],"references":[{"url":"https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190925-iox","tags":["vendor-advisory","x_refsource_CISCO","x_transferred","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2019-12656"},{"url":"https://github.com/advisories/GHSA-6r46-67j7-hr8v"}],"sources":{"cve":[{"id":"CVE-2019-12656","title":"Cisco IOx Application Environment Denial of Service Vulnerability","description":"A vulnerability in the IOx application environment of multiple Cisco platforms could allow an unauthenticated, remote attacker to cause the IOx web server to stop processing HTTPS requests, resulting in a denial of service (DoS) condition. The vulnerability is due to a Transport Layer Security (TLS) implementation issue. An attacker could exploit this vulnerability by sending crafted TLS packets to the IOx web server on an affected device. A successful exploit could allow the attacker to cause the IOx web server to stop processing HTTPS requests, resulting in a DoS condition.","status":"published","published":"2019-09-25T20:16:01.334Z","modified":"2024-11-19T18:55:13.497Z","cvss":[{"version":"3.0","score":7.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:20:24.025419Z"}],"euvd":[{"id":"EUVD-2019-4247","description":"A vulnerability in the IOx application environment of multiple Cisco platforms could allow an unauthenticated, remote attacker to cause the IOx web server to stop processing HTTPS requests, resulting in a denial of service (DoS) condition. The vulnerability is due to a Transport Layer Security (TLS) implementation issue. An attacker could exploit this vulnerability by sending crafted TLS packets to the IOx web server on an affected device. A successful exploit could allow the attacker to cause the IOx web server to stop processing HTTPS requests, resulting in a DoS condition.","status":"published","published":"2019-09-25T20:16:01Z","modified":"2024-11-19T18:55:13Z","cvss":[{"version":"3.0","score":7.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-03T00:04:55.637912Z"}],"ghsa":[{"id":"GHSA-6r46-67j7-hr8v","title":"A vulnerability in the IOx application environment of multiple Cisco platforms could allow an...","description":"A vulnerability in the IOx application environment of multiple Cisco platforms could allow an unauthenticated, remote attacker to cause the IOx web server to stop processing HTTPS requests, resulting in a denial of service (DoS) condition. The vulnerability is due to a Transport Layer Security (TLS) implementation issue. An attacker could exploit this vulnerability by sending crafted TLS packets to the IOx web server on an affected device. A successful exploit could allow the attacker to cause the IOx web server to stop processing HTTPS requests, resulting in a DoS condition.","status":"published","published":"2022-05-24T16:56:49Z","modified":"2023-01-28T05:07:18Z","updated_at":"2026-11-02T14:44:30.65038Z"}],"nvd":[{"id":"CVE-2019-12656","description":"A vulnerability in the IOx application environment of multiple Cisco platforms could allow an unauthenticated, remote attacker to cause the IOx web server to stop processing HTTPS requests, resulting in a denial of service (DoS) condition. The vulnerability is due to a Transport Layer Security (TLS) implementation issue. An attacker could exploit this vulnerability by sending crafted TLS packets to the IOx web server on an affected device. A successful exploit could allow the attacker to cause the IOx web server to stop processing HTTPS requests, resulting in a DoS condition.","status":"published","published":"2019-09-25T21:15:10.827Z","modified":"2026-06-17T02:15:09.16Z","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":"primary"},{"version":"3.0","score":7.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:05:30.039477Z"}]}}