FKIE_CVE-2026-20321

Vulnerability from fkie_nvd - Published: 2026-10-07 17:16 - Updated: 2026-10-08 20:08
Severity
6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
Summary
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. This 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.
References
psirt@cisco.comhttps://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apic-cmdinj-L6VR4E7
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "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)"
            }
          ]
        }
      ],
      "source": "psirt@cisco.com"
    }
  ],
  "cveTags": [],
  "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."
    }
  ],
  "id": "CVE-2026-20321",
  "lastModified": "2026-10-08T20:08:45.857",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "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"
        },
        "exploitabilityScore": 1.2,
        "impactScore": 5.2,
        "source": "psirt@cisco.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-20321",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-10-08T15:33:24.102382Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-10-07T17:16:55.013",
  "references": [
    {
      "source": "psirt@cisco.com",
      "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apic-cmdinj-L6VR4E7"
    }
  ],
  "sourceIdentifier": "psirt@cisco.com",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-544"
        }
      ],
      "source": "psirt@cisco.com",
      "type": "Secondary"
    }
  ]
}



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