{"api_version":"1","generated_at":"2026-04-23T04:20:40+00:00","cve":"CVE-2021-1621","urls":{"html":"https://cve.report/CVE-2021-1621","api":"https://cve.report/api/cve/CVE-2021-1621.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2021-1621","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-1621"},"summary":{"title":"CVE-2021-1621","description":"A 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. 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Internetwork Operating System (IOS) XE Software Interface Queue Wedge Denial of Service (DOS) Vulnerability (cisco-sa-quewedge-69BsHUBW)"}]},"source_records":{"cve_program":{"CVE_data_meta":{"ASSIGNER":"psirt@cisco.com","DATE_PUBLIC":"2021-09-22T16:00:00","ID":"CVE-2021-1621","STATE":"PUBLIC","TITLE":"Cisco IOS XE Software Interface Queue Wedge Denial of Service Vulnerability"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"Cisco IOS XE Software ","version":{"version_data":[{"version_value":"n/a"}]}}]},"vendor_name":"Cisco"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"A 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."}]},"exploit":[{"lang":"eng","value":"The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory. 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