{"id":"CVE-2026-20321","state":"PUBLISHED","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.","publishedAt":"2026-10-07T16:11:55.074Z","updatedAt":"2026-10-08T15:33:31.802Z","severity":{"score":6.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N","source":"cisco"},"assigner":"cisco","products":["Cisco Cisco Application Policy Infrastructure Controller (APIC)"],"affected":[{"vendor":"Cisco","product":"Cisco Application Policy Infrastructure Controller (APIC)","defaultStatus":"unknown","versions":[{"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)","status":"affected"}]}],"references":["https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apic-cmdinj-L6VR4E7"],"weaknesses":["CWE-544"],"ingestedAt":"2026-10-29T20:11:10.572Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/20xxx/CVE-2026-20321.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-20321","state":"PUBLISHED","datePublished":"2026-10-07T16:11:55.074Z","dateUpdated":"2026-10-08T15:33:31.802Z","assignerShortName":"cisco","assignerOrgId":"d1c1063e-7a18-46af-9102-31f8928bc633","dateReserved":"2025-10-08T11:59:15.411Z"},"containers":{"cna":{"title":"Cisco Application Policy Infrastructure Controller API Command Injection Vulnerability","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."}],"affected":[{"vendor":"Cisco","product":"Cisco Application Policy Infrastructure Controller (APIC)","defaultStatus":"unknown","versions":[{"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)","status":"affected"}]}],"references":[{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apic-cmdinj-L6VR4E7","name":"cisco-sa-apic-cmdinj-L6VR4E7"}],"metrics":[{"format":"cvssV3_1","cvssV3_1":{"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-544","lang":"en","description":"Missing Standardized Error Handling Mechanism","type":"cwe"}]}],"providerMetadata":{"shortName":"cisco","orgId":"d1c1063e-7a18-46af-9102-31f8928bc633","dateUpdated":"2026-10-07T16:11:55.074Z"},"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."}],"source":{"advisory":"cisco-sa-apic-cmdinj-L6VR4E7","discovery":"EXTERNAL","defects":["CSCwv43177"]}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-08T15:33:24.102382Z","id":"CVE-2026-20321","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-08T15:33:31.802Z"}}]}}}