{"id":"CVE-2019-16027","aliases":["EUVD-2019-6916","GHSA-69gf-2w85-7g9q"],"status":"published","title":"Cisco IOS XR Software Intermediate System–to–Intermediate System Denial of Service Vulnerability","description":"A vulnerability in the implementation of the Intermediate System\u0026ndash;to\u0026ndash;Intermediate System (IS\u0026ndash;IS) routing protocol functionality in Cisco IOS XR Software could allow an authenticated, remote attacker to cause a denial of service (DoS) condition in the IS\u0026ndash;IS process. The vulnerability is due to improper handling of a Simple Network Management Protocol (SNMP) request for specific Object Identifiers (OIDs) by the IS\u0026ndash;IS process. An attacker could exploit this vulnerability by sending a crafted SNMP request to the affected device. A successful exploit could allow the attacker to cause a DoS condition in the IS\u0026ndash;IS process.","severity":{"version":"3.0","score":7.7,"vector":"CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.01513,"percentile":0.74672,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-20"],"published":"2020-01-26T04:31:08Z","modified":"2026-06-17T02:21:35Z","products":[{"vendor":"cisco","product":"cisco ios xr software"},{"vendor":"cisco","product":"ios_xr"}],"references":[{"url":"https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200122-ios-xr-dos","tags":["vendor-advisory","x_refsource_CISCO","x_transferred","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2019-16027"},{"url":"https://github.com/advisories/GHSA-69gf-2w85-7g9q"}],"sources":{"cve":[{"id":"CVE-2019-16027","title":"Cisco IOS XR Software Intermediate System–to–Intermediate System Denial of Service Vulnerability","description":"A vulnerability in the implementation of the Intermediate System\u0026ndash;to\u0026ndash;Intermediate System (IS\u0026ndash;IS) routing protocol functionality in Cisco IOS XR Software could allow an authenticated, remote attacker to cause a denial of service (DoS) condition in the IS\u0026ndash;IS process. The vulnerability is due to improper handling of a Simple Network Management Protocol (SNMP) request for specific Object Identifiers (OIDs) by the IS\u0026ndash;IS process. An attacker could exploit this vulnerability by sending a crafted SNMP request to the affected device. A successful exploit could allow the attacker to cause a DoS condition in the IS\u0026ndash;IS process.","status":"published","published":"2020-01-26T04:31:08.495Z","modified":"2024-11-15T17:46:10.927Z","cvss":[{"version":"3.0","score":7.7,"vector":"CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:32:23.189113Z"}],"euvd":[{"id":"EUVD-2019-6916","description":"A vulnerability in the implementation of the Intermediate System\u0026ndash;to\u0026ndash;Intermediate System (IS\u0026ndash;IS) routing protocol functionality in Cisco IOS XR Software could allow an authenticated, remote attacker to cause a denial of service (DoS) condition in the IS\u0026ndash;IS process. The vulnerability is due to improper handling of a Simple Network Management Protocol (SNMP) request for specific Object Identifiers (OIDs) by the IS\u0026ndash;IS process. An attacker could exploit this vulnerability by sending a crafted SNMP request to the affected device. A successful exploit could allow the attacker to cause a DoS condition in the IS\u0026ndash;IS process.","status":"published","published":"2020-01-26T04:31:08Z","modified":"2024-11-15T17:46:10Z","cvss":[{"version":"3.0","score":7.7,"vector":"CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-03T00:04:58.20762Z"}],"ghsa":[{"id":"GHSA-69gf-2w85-7g9q","title":"A vulnerability in the implementation of the Intermediate System\u0026ndash;to\u0026ndash;Intermediate...","description":"A vulnerability in the implementation of the Intermediate System\u0026ndash;to\u0026ndash;Intermediate System (IS\u0026ndash;IS) routing protocol functionality in Cisco IOS XR Software could allow an authenticated, remote attacker to cause a denial of service (DoS) condition in the IS\u0026ndash;IS process. The vulnerability is due to improper handling of a Simple Network Management Protocol (SNMP) request for specific Object Identifiers (OIDs) by the IS\u0026ndash;IS process. An attacker could exploit this vulnerability by sending a crafted SNMP request to the affected device. A successful exploit could allow the attacker to cause a DoS condition in the IS\u0026ndash;IS process.","status":"published","published":"2022-05-24T17:07:22Z","modified":"2023-01-29T05:01:22Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:44:48.378382Z"}],"nvd":[{"id":"CVE-2019-16027","description":"A vulnerability in the implementation of the Intermediate System\u0026ndash;to\u0026ndash;Intermediate System (IS\u0026ndash;IS) routing protocol functionality in Cisco IOS XR Software could allow an authenticated, remote attacker to cause a denial of service (DoS) condition in the IS\u0026ndash;IS process. The vulnerability is due to improper handling of a Simple Network Management Protocol (SNMP) request for specific Object Identifiers (OIDs) by the IS\u0026ndash;IS process. An attacker could exploit this vulnerability by sending a crafted SNMP request to the affected device. A successful exploit could allow the attacker to cause a DoS condition in the IS\u0026ndash;IS process.","status":"published","published":"2020-01-26T05:15:16.677Z","modified":"2026-06-17T02:21:35.55Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary"},{"version":"3.0","score":7.7,"vector":"CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H","level":"high","assessor":"secondary"},{"version":"2.0","score":4,"vector":"AV:N/AC:L/Au:S/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:05:43.875329Z"}]}}