{"api_version":"1","generated_at":"2026-10-07T22:56:58+00:00","cve":"CVE-2026-20321","urls":{"html":"https://cve.report/CVE-2026-20321","api":"https://cve.report/api/cve/CVE-2026-20321.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-20321","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-20321"},"summary":{"title":"Cisco Application Policy Infrastructure Controller API Command Injection Vulnerability","description":"A vulnerability in the web-based management API for Cisco Application Policy Infrastructure Controller (APIC) could allow an authenticated, remote attacker to execute arbitrary commands as the root user. To exploit this vulnerability, the attacker must have valid administrative credentials.\r\n\r\nThis vulnerability is due to insufficient input validation of user-controlled command arguments. An attacker could exploit this vulnerability by authenticating using the API and sending crafted input. A successful exploit could allow the attacker to execute arbitrary commands on the underlying operating system of an affected device with root-level privileges.","state":"PUBLISHED","assigner":"cisco","published_at":"2026-10-07 17:16:55","updated_at":"2026-10-07 17:16:55"},"problem_types":["CWE-544","CWE-544 Missing Standardized Error Handling Mechanism"],"metrics":[{"version":"3.1","source":"psirt@cisco.com","type":"Primary","score":"6.5","severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N","baseScore":6.5,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"HIGH","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"NONE"}},{"version":"3.1","source":"CNA","type":"CVSSV3_1","score":"6.5","severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N","data":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"HIGH","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N","version":"3.1"}}],"references":[{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apic-cmdinj-L6VR4E7","name":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apic-cmdinj-L6VR4E7","refsource":"psirt@cisco.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-20321","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-20321","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Cisco","product":"Cisco Application Policy Infrastructure Controller (APIC)","version":"affected 5.3(1d)","platforms":[]},{"source":"CNA","vendor":"Cisco","product":"Cisco Application Policy Infrastructure Controller (APIC)","version":"affected 5.3(2a)","platforms":[]},{"source":"CNA","vendor":"Cisco","product":"Cisco Application Policy Infrastructure Controller (APIC)","version":"affected 5.3(2b)","platforms":[]},{"source":"CNA","vendor":"Cisco","product":"Cisco Application Policy Infrastructure Controller (APIC)","version":"affected 5.3(2c)","platforms":[]},{"source":"CNA","vendor":"Cisco","product":"Cisco Application Policy Infrastructure Controller (APIC)","version":"affected 5.3(2d)","platforms":[]},{"source":"CNA","vendor":"Cisco","product":"Cisco Application Policy Infrastructure Controller (APIC)","version":"affected 5.3(2e)","platforms":[]},{"source":"CNA","vendor":"Cisco","product":"Cisco Application Policy Infrastructure Controller (APIC)","version":"affected 5.3(2f)","platforms":[]},{"source":"CNA","vendor":"Cisco","product":"Cisco Application Policy Infrastructure Controller (APIC)","version":"affected 6.1(5e)","platforms":[]},{"source":"CNA","vendor":"Cisco","product":"Cisco Application Policy Infrastructure Controller (APIC)","version":"affected 6.2(1f)","platforms":[]},{"source":"CNA","vendor":"Cisco","product":"Cisco Application Policy Infrastructure Controller (APIC)","version":"affected 6.2(1g)","platforms":[]},{"source":"CNA","vendor":"Cisco","product":"Cisco Application Policy Infrastructure Controller (APIC)","version":"affected 6.2(2e)","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[{"source":"CNA","title":"","value":"The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.","time":"","lang":"en"}],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unknown","product":"Cisco Application Policy Infrastructure Controller (APIC)","vendor":"Cisco","versions":[{"status":"affected","version":"5.3(1d)"},{"status":"affected","version":"5.3(2a)"},{"status":"affected","version":"5.3(2b)"},{"status":"affected","version":"5.3(2c)"},{"status":"affected","version":"5.3(2d)"},{"status":"affected","version":"5.3(2e)"},{"status":"affected","version":"5.3(2f)"},{"status":"affected","version":"6.1(5e)"},{"status":"affected","version":"6.2(1f)"},{"status":"affected","version":"6.2(1g)"},{"status":"affected","version":"6.2(2e)"}]}],"descriptions":[{"lang":"en","value":"A vulnerability in the web-based management API for Cisco Application Policy Infrastructure Controller (APIC) could allow an authenticated, remote attacker to execute arbitrary commands as the root user. To exploit this vulnerability, the attacker must have valid administrative credentials.\r\n\r\nThis vulnerability is due to insufficient input validation of user-controlled command arguments. An attacker could exploit this vulnerability by authenticating using the API and sending crafted input. A successful exploit could allow the attacker to execute arbitrary commands on the underlying operating system of an affected device with root-level privileges."}],"exploits":[{"lang":"en","value":"The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory."}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"HIGH","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N","version":"3.1"},"format":"cvssV3_1"}],"problemTypes":[{"descriptions":[{"cweId":"CWE-544","description":"Missing Standardized Error Handling Mechanism","lang":"en","type":"cwe"}]}],"providerMetadata":{"dateUpdated":"2026-10-07T16:11:55.074Z","orgId":"d1c1063e-7a18-46af-9102-31f8928bc633","shortName":"cisco"},"references":[{"name":"cisco-sa-apic-cmdinj-L6VR4E7","url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apic-cmdinj-L6VR4E7"}],"source":{"advisory":"cisco-sa-apic-cmdinj-L6VR4E7","defects":["CSCwv43177"],"discovery":"EXTERNAL"},"title":"Cisco Application Policy Infrastructure Controller API Command Injection Vulnerability"}},"cveMetadata":{"assignerOrgId":"d1c1063e-7a18-46af-9102-31f8928bc633","assignerShortName":"cisco","cveId":"CVE-2026-20321","datePublished":"2026-10-07T16:11:55.074Z","dateReserved":"2025-10-08T11:59:15.411Z","dateUpdated":"2026-10-07T16:11:55.074Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-10-07 17:16:55","lastModifiedDate":"2026-10-07 17:16:55","problem_types":["CWE-544","CWE-544 Missing Standardized Error Handling Mechanism"],"metrics":{"cvssMetricV31":[{"source":"psirt@cisco.com","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N","baseScore":6.5,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"HIGH","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"NONE"},"exploitabilityScore":1.2,"impactScore":5.2}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"20321","Ordinal":"1","Title":"Cisco Application Policy Infrastructure Controller API Command I","CVE":"CVE-2026-20321","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"20321","Ordinal":"1","NoteData":"A vulnerability in the web-based management API for Cisco Application Policy Infrastructure Controller (APIC) could allow an authenticated, remote attacker to execute arbitrary commands as the root user. To exploit this vulnerability, the attacker must have valid administrative credentials.\r\n\r\nThis vulnerability is due to insufficient input validation of user-controlled command arguments. An attacker could exploit this vulnerability by authenticating using the API and sending crafted input. A successful exploit could allow the attacker to execute arbitrary commands on the underlying operating system of an affected device with root-level privileges.","Type":"Description","Title":"Cisco Application Policy Infrastructure Controller API Command I"}]}}}