CVE-2025-20311

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A successful exploit could allow the attacker to cause the egress port to which the crafted frame is forwarded to start dropping all frames, resulting in a denial of service (DoS) condition."}], "affected": [{"vendor": "Cisco", "product": "Cisco IOS XE Software", "versions": [{"version": "16.6.1", "status": "affected"}, {"version": "16.6.2", "status": "affected"}, {"version": "16.6.3", "status": "affected"}, {"version": "16.6.4", "status": "affected"}, {"version": "16.6.5", "status": "affected"}, {"version": "16.6.4a", "status": "affected"}, {"version": "16.6.6", "status": "affected"}, {"version": "16.6.7", "status": "affected"}, {"version": "16.6.8", "status": "affected"}, {"version": "16.6.9", "status": "affected"}, {"version": "16.6.10", "status": "affected"}, {"version": "16.7.1", "status": "affected"}, {"version": "16.8.1", "status": "affected"}, {"version": "16.8.1a", "status": "affected"}, {"version": "16.8.1s", "status": "affected"}, {"version": "16.9.1", "status": "affected"}, 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"vulnerable": false}], "negate": false, "operator": "OR"}], "operator": "AND"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "A vulnerability in the handling of certain Ethernet frames in Cisco IOS XE Software for Catalyst 9000 Series Switches could allow an unauthenticated, adjacent attacker to cause an egress port to become blocked and drop all outbound traffic.\r\n\r This vulnerability is due to improper handling of crafted Ethernet frames. An attacker could exploit this vulnerability by sending crafted Ethernet frames through an affected switch. A successful exploit could allow the attacker to cause the egress port to which the crafted frame is forwarded to start dropping all frames, resulting in a denial of service (DoS) condition."}, {"lang": "es", "value": "Una vulnerabilidad en el manejo de ciertos frames Ethernet en el software Cisco IOS XE para switches de la serie Catalyst 9000 podr\u00eda permitir a un atacante adyacente no autenticado causar que un puerto de salida se bloquee y descarte todo el tr\u00e1fico saliente. Esta vulnerabilidad se debe al manejo inadecuado de frames Ethernet manipulados. Un atacante podr\u00eda explotar esta vulnerabilidad enviando frames Ethernet manipulados a trav\u00e9s de un switch afectado. Un exploit exitoso podr\u00eda permitir al atacante causar que el puerto de salida al que se reenv\u00eda el frame manipulado comience a descartar todos los frames, resultando en una condici\u00f3n de denegaci\u00f3n de servicio (DoS)."}], "id": "CVE-2025-20311", "lastModified": "2026-09-26T00:10:00.127", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.4, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 4.0, "source": "psirt@cisco.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-20311", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2025-09-24T18:07:27.423618Z", "version": "2.0.3"}}]}, "published": "2025-09-24T18:15:34.757", "references": [{"source": "psirt@cisco.com", "tags": ["Vendor Advisory"], "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cat9k-PtmD7bgy"}], "sourceIdentifier": "psirt@cisco.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-19"}], "source": "psirt@cisco.com", "type": "Secondary"}]}

{}

{"created": "2025-09-25T08:21:14.695030+00:00", "updated": "2025-09-25T08:21:14.695089+00:00", "vendors": ["cisco", "cisco$PRODUCT$ios_xe_software"]}