CVE-2021-1220

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Note: These vulnerabilities do not affect the console connection."}]}, "exploit": [{"lang": "en", "value": "The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory."}], "impact": {"cvss": {"baseScore": "4.3", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L", "version": "3.0"}}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "CWE-20"}]}]}, "references": {"reference_data": [{"name": "20210324 Cisco IOS XE Software Web UI Denial of Service Vulnerabilities", "refsource": "CISCO", "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-xe-webui-dos-z9yqYQAn"}]}, "source": {"advisory": "cisco-sa-xe-webui-dos-z9yqYQAn", "defect": [["CSCvu94117", "CSCvu99729"]], "discovery": "INTERNAL"}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T16:02:56.181Z"}, "title": "CVE Program Container", "references": [{"name": "20210324 Cisco IOS XE Software Web UI Denial of Service Vulnerabilities", "tags": ["vendor-advisory", "x_refsource_CISCO", "x_transferred"], "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-xe-webui-dos-z9yqYQAn"}]}]}, "cveMetadata": {"assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633", "assignerShortName": "cisco", "cveId": "CVE-2021-1220", "datePublished": "2021-03-24T20:16:10.422Z", "dateReserved": "2020-11-13T00:00:00.000Z", "dateUpdated": "2024-09-17T03:43:34.793Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

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These vulnerabilities are due to insufficient error handling in the web UI. An attacker could exploit these vulnerabilities by sending crafted HTTP packets to an affected device. A successful exploit could allow the attacker to cause the web UI software to become unresponsive and consume all available vty lines, preventing new session establishment and resulting in a DoS condition. Manual intervention would be required to regain web UI and vty session functionality. Note: These vulnerabilities do not affect the console connection."}, {"lang": "es", "value": "M\u00faltiples vulnerabilidades en la Interfaz de Usuario Web del Software Cisco IOS XE, podr\u00edan permitir a un atacante remoto autenticado con privilegios de solo lectura hacer que el software de la interfaz de usuario web deje de responder y consuma instancias de l\u00ednea vty, lo que resultar\u00e1 en una condici\u00f3n de denegaci\u00f3n de servicio (DoS). Estas vulnerabilidades son debido a un manejo insuficiente de errores en la Interfaz de Usuario Web. Un atacante podr\u00eda explotar estas vulnerabilidades mediante el env\u00edo de paquetes HTTP dise\u00f1ados a un dispositivo afectado. Una explotaci\u00f3n con \u00e9xito podr\u00eda permitir el atacante causar que el software de la interfaz de usuario web deje de responder y consumiera todas las l\u00edneas vty disponibles, impidiendo el establecimiento de una nueva sesi\u00f3n y dando como resultado una condici\u00f3n de DoS. Se necesitar\u00eda una intervenci\u00f3n manual para recuperar la Interfaz de Usuario Web y la funcionalidad de la sesi\u00f3n vty. Nota: estas vulnerabilidades no afectan la conexi\u00f3n de la consola"}], "id": "CVE-2021-1220", "lastModified": "2026-06-17T03:31:15.203", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "LOW", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "SINGLE", "availabilityImpact": "PARTIAL", "baseScore": 3.5, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:M/Au:S/C:N/I:N/A:P", "version": "2.0"}, "exploitabilityScore": 6.8, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 4.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 1.4, "source": "psirt@cisco.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 4.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 1.4, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-03-24T21:15:11.350", "references": [{"source": "psirt@cisco.com", "tags": ["Vendor Advisory"], "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-xe-webui-dos-z9yqYQAn"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-xe-webui-dos-z9yqYQAn"}], "sourceIdentifier": "psirt@cisco.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-20"}], "source": "psirt@cisco.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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