{"api_version":"1","generated_at":"2026-04-23T01:19:05+00:00","cve":"CVE-2021-1592","urls":{"html":"https://cve.report/CVE-2021-1592","api":"https://cve.report/api/cve/CVE-2021-1592.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2021-1592","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-1592"},"summary":{"title":"CVE-2021-1592","description":"A vulnerability in the way Cisco UCS Manager software handles SSH sessions could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper resource management for established SSH sessions. An attacker could exploit this vulnerability by opening a significant number of SSH sessions on an affected device. A successful exploit could allow the attacker to cause a crash and restart of internal Cisco UCS Manager software processes and a temporary loss of access to the Cisco UCS Manager CLI and web UI. Note: The attacker must have valid user credentials to authenticate to the affected device.","state":"PUBLIC","assigner":"psirt@cisco.com","published_at":"2021-08-25 20:15:00","updated_at":"2023-11-07 03:28:00"},"problem_types":["CWE-770"],"metrics":[],"references":[{"url":"https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ucs-ssh-dos-MgvmyrQy","name":"20210825 Cisco UCS Manager Software SSH Sessions Denial of Service Vulnerability","refsource":"CISCO","tags":[],"title":"Cisco UCS Manager Software SSH Sessions Denial of Service Vulnerability","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-1592","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-1592","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2021","cve_id":"1592","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"cisco","cpe5":"unified_computing_system","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"1592","vulnerable":"-1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"h","cpe4":"cisco","cpe5":"unified_computing_system_64108","cpe6":"-","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"1592","vulnerable":"-1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"h","cpe4":"cisco","cpe5":"unified_computing_system_6454","cpe6":"-","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[{"cve":"CVE-2021-1592","qid":"317025","title":"Cisco UCS Manager Software SSH Sessions Denial of Service Vulnerability (cisco-sa-ucs-ssh-dos-MgvmyrQy)"}]},"source_records":{"cve_program":{"CVE_data_meta":{"ASSIGNER":"psirt@cisco.com","DATE_PUBLIC":"2021-08-25T16:00:00","ID":"CVE-2021-1592","STATE":"PUBLIC","TITLE":"Cisco UCS Manager Software SSH Sessions Denial of Service Vulnerability"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"Cisco Unified Computing System (Managed) ","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 way Cisco UCS Manager software handles SSH sessions could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper resource management for established SSH sessions. An attacker could exploit this vulnerability by opening a significant number of SSH sessions on an affected device. A successful exploit could allow the attacker to cause a crash and restart of internal Cisco UCS Manager software processes and a temporary loss of access to the Cisco UCS Manager CLI and web UI. Note: The attacker must have valid user credentials to authenticate to the affected device."}]},"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. "}],"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-664"}]}]},"references":{"reference_data":[{"name":"20210825 Cisco UCS Manager Software SSH Sessions Denial of Service Vulnerability","refsource":"CISCO","url":"https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ucs-ssh-dos-MgvmyrQy"}]},"source":{"advisory":"cisco-sa-ucs-ssh-dos-MgvmyrQy","defect":[["CSCvw33513"]],"discovery":"INTERNAL"}},"nvd":{"publishedDate":"2021-08-25 20:15:00","lastModifiedDate":"2023-11-07 03:28:00","problem_types":["CWE-770"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"LOW","baseScore":4.3,"baseSeverity":"MEDIUM"},"exploitabilityScore":2.8,"impactScore":1.4},"baseMetricV2":{"cvssV2":{"version":"2.0","vectorString":"AV:N/AC:L/Au:S/C:N/I:N/A:P","accessVector":"NETWORK","accessComplexity":"LOW","authentication":"SINGLE","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"PARTIAL","baseScore":4},"severity":"MEDIUM","exploitabilityScore":8,"impactScore":2.9,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":false}},"configurations":{"CVE_data_version":"4.0","nodes":[{"operator":"AND","children":[{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:cisco:unified_computing_system:*:*:*:*:*:*:*:*","versionStartIncluding":"4.0","versionEndExcluding":"4.0\\(4m\\)","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:cisco:unified_computing_system:*:*:*:*:*:*:*:*","versionStartIncluding":"4.1","versionEndExcluding":"4.1\\(3e\\)","cpe_name":[]}]},{"operator":"OR","children":[],"cpe_match":[{"vulnerable":false,"cpe23Uri":"cpe:2.3:h:cisco:unified_computing_system_64108:-:*:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":false,"cpe23Uri":"cpe:2.3:h:cisco:unified_computing_system_6454:-:*:*:*:*:*:*:*","cpe_name":[]}]}],"cpe_match":[]}]}},"legacy_mitre":{"record":{"CveYear":"2021","CveId":"1592","Ordinal":"191665","Title":"CVE-2021-1592","CVE":"CVE-2021-1592","Year":"2021"},"notes":[{"CveYear":"2021","CveId":"1592","Ordinal":"1","NoteData":"A vulnerability in the way Cisco UCS Manager software handles SSH sessions could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper resource management for established SSH sessions. An attacker could exploit this vulnerability by opening a significant number of SSH sessions on an affected device. A successful exploit could allow the attacker to cause a crash and restart of internal Cisco UCS Manager software processes and a temporary loss of access to the Cisco UCS Manager CLI and web UI. Note: The attacker must have valid user credentials to authenticate to the affected device.","Type":"Description","Title":null},{"CveYear":"2021","CveId":"1592","Ordinal":"2","NoteData":"2021-08-25","Type":"Other","Title":"Published"},{"CveYear":"2021","CveId":"1592","Ordinal":"3","NoteData":"2021-08-25","Type":"Other","Title":"Modified"}]}}}