{"schema":"threatline.record/2","record":{"id":"CVE-2026-20173","aliases":[],"summary":"Cisco NX-OS Software Denial of Service Vulnerability","details":"A vulnerability in Cisco NX-OS Software could allow an unauthenticated, remote attacker to exhaust system resources, causing a denial of service (DoS) condition.\r\n\r\nThis vulnerability exists because rate limiting was improperly applied to some protocols. An attacker could exploit this vulnerability by sending a high rate of UDP or TCP connections to a data plane interface on an affected device. A successful exploit could allow the attacker to cause instability to various routing and control plane protocols through some packet loss and temporary disruptions, causing a DoS condition. This DoS condition will clear without manual intervention soon after the high rate of traffic is stopped.","categories":["Network & edge"],"product":"Cisco NX-OS Software","vendor":"Cisco","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-20173","source_modified_at":"2026-10-07T17:42:39.672Z","fetched_at":"2026-10-23T18:48:36.087640Z","product":"Cisco NX-OS Software","vendor":"Cisco","versions":[{"version":"8.2(5)","status":"affected"},{"version":"7.3(5)D1(1)","status":"affected"},{"version":"8.4(2)","status":"affected"},{"version":"8.4(3)","status":"affected"},{"version":"9.2(3)","status":"affected"},{"version":"9.2(2v)","status":"affected"},{"version":"7.3(4)D1(1)","status":"affected"},{"version":"8.2(1)","status":"affected"},{"version":"9.2(1)","status":"affected"},{"version":"9.2(2t)","status":"affected"},{"version":"9.2(3y)","status":"affected"},{"version":"9.3(2)","status":"affected"},{"version":"8.1(1)","status":"affected"},{"version":"8.2(2)","status":"affected"},{"version":"8.3(2)","status":"affected"},{"version":"7.3(2)D1(3a)","status":"affected"},{"version":"9.2(4)","status":"affected"},{"version":"8.1(2)","status":"affected"},{"version":"7.3(3)D1(1)","status":"affected"},{"version":"8.2(3)","status":"affected"},{"version":"8.4(1)","status":"affected"},{"version":"7.3(0)DX(1)","status":"affected"},{"version":"7.3(2)D1(1)","status":"affected"},{"version":"9.3(1)","status":"affected"},{"version":"7.3(2)D1(2)","status":"affected"},{"version":"8.2(4)","status":"affected"},{"version":"9.3(1z)","status":"affected"},{"version":"9.2(2)","status":"affected"},{"version":"8.1(2a)","status":"affected"},{"version":"7.3(2)D1(3)","status":"affected"}],"defaultStatus":"unknown"}],"fixed_versions":[],"cvss":5.8,"severity":"Medium","kev":{"listed":false},"epss":{"probability":0.00373,"percentile":0.3007,"score_date":"2026-10-23"},"published_at":"2026-10-07T16:12:04.505Z","modified_at":"2026-10-07T17:42:39.672Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-20173","fetched_at":"2026-10-23T18:48:36.087640Z","source_modified_at":"2026-10-07T17:42:39.672Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-20173","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-nscpdos-SnderkC7"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"none","automatable":"yes","technical_impact":"partial","assessed_at":"2026-10-07T17:42:18.044011Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-07T17:42:39.672Z","content_hash":"304ffc7bbc54d1df49fe16b636396b44011a9849730a1f07a4ab32b32ea020b5"}}