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vulnerability in the Layer 2 punt code of Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to cause a queue wedge on an interface that receives specific Layer 2 frames, resulting in a denial of service (DoS) condition. This vulnerability is due to improper handling of certain Layer 2 frames. An attacker could exploit this vulnerability by sending specific Layer 2 frames on the segment the router is connected to. A successful exploit could allow the attacker to cause a queue wedge on the interface, resulting in a DoS condition."},{"lang":"es","value":"Una vulnerabilidad en el código de punt de Capa 2 de Cisco IOS XE Software podría permitir a un atacante adyacente y no autenticado causar una queue wedge en una interfaz que reciba tramas específicas de Capa 2, resultando en una condición de denegación de servicio (DoS). Esta vulnerabilidad es debido al manejo inapropiado de determinadas tramas de capa 2. Un atacante podría explotar esta vulnerabilidad mediante el envío de tramas específicas de capa 2 en el segmento al que está conectado el router. Una explotación con éxito podría permitir al atacante causar una queue wedge en la interfaz, resultando en una condición de DoS"}],"id":"CVE-2021-1621","lastModified":"2026-06-17T03:32:11.247","metrics":{"cvssMetricV2":[{"acInsufInfo":false,"baseSeverity":"LOW","cvssData":{"accessComplexity":"LOW","accessVector":"ADJACENT_NETWORK","authentication":"NONE","availabilityImpact":"PARTIAL","baseScore":3.3,"confidentialityImpact":"NONE","integrityImpact":"NONE","vectorString":"AV:A/AC:L/Au:N/C:N/I:N/A:P","version":"2.0"},"exploitabilityScore":6.5,"impactScore":2.9,"obtainAllPrivilege":false,"obtainOtherPrivilege":false,"obtainUserPrivilege":false,"source":"nvd@nist.gov","type":"Primary","userInteractionRequired":false}],"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"},{"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":"nvd@nist.gov","type":"Primary"}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"id":"CVE-2021-1621","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","timestamp":"2024-11-07T21:40:24.888506Z","version":"2.0.3"}}]},"published":"2021-09-23T03:15:13.210","references":[{"source":"psirt@cisco.com","tags":["Patch","Vendor Advisory"],"url":"https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-quewedge-69BsHUBW"},{"source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch","Vendor Advisory"],"url":"https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-quewedge-69BsHUBW"}],"sourceIdentifier":"psirt@cisco.com","vulnStatus":"Modified","weaknesses":[{"description":[{"lang":"en","value":"CWE-399"}],"source":"psirt@cisco.com","type":"Secondary"},{"description":[{"lang":"en","value":"NVD-CWE-noinfo"}],"source":"nvd@nist.gov","type":"Primary"}]}