{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-20084",
        "assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
        "state": "PUBLISHED",
        "assignerShortName": "cisco",
        "dateReserved": "2025-10-08T11:59:15.366Z",
        "datePublished": "2026-03-25T16:02:39.119Z",
        "dateUpdated": "2026-03-26T17:35:50.008Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
                "shortName": "cisco",
                "dateUpdated": "2026-03-25T16:02:39.119Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "A vulnerability in the DHCP snooping feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause BOOTP packets to be forwarded between VLANs, resulting in a denial of service (DoS) condition. \r\n\r This vulnerability is due to improper handling of BOOTP packets on Cisco Catalyst 9000 Series Switches. An attacker could exploit this vulnerability by sending BOOTP request packets to an affected device. A successful exploit could allow an attacker to forward BOOTP packets from one VLAN to another, resulting in BOOTP VLAN leakage and potentially leading to high CPU utilization. This makes the device unreachable (either through console or remote management) and unable to forward traffic, resulting in a DoS condition. \r\n\r Note: This vulnerability can be exploited with either unicast or broadcast BOOTP packets.\r\n\r   There are workarounds that address this vulnerability."
                }
            ],
            "affected": [
                {
                    "vendor": "Cisco",
                    "product": "Cisco IOS XE Software",
                    "versions": [
                        {
                            "version": "16.6.1",
                            "status": "affected"
                        },
                        {
                            "version": "16.6.2",
                            "status": "affected"
                        },
                        {
                            "version": "16.6.3",
                            "status": "affected"
                        },
                        {
                            "version": "16.6.4",
                            "status": "affected"
                        },
                        {
                            "version": "16.6.5",
                            "status": "affected"
                        },
                        {
                            "version": "16.6.4a",
                            "status": "affected"
                        },
                        {
                            "version": "16.6.6",
                            "status": "affected"
                        },
                        {
                            "version": "16.6.7",
                            "status": "affected"
                        },
                        {
                            "version": "16.6.8",
                            "status": "affected"
                        },
                        {
                            "version": "16.6.9",
                            "status": "affected"
                        },
                        {
                            "version": "16.6.10",
                            "status": "affected"
                        },
                        {
                            "version": "16.7.1",
                            "status": "affected"
                        },
                        {
                            "version": "16.8.1",
                            "status": "affected"
                        },
                        {
                            "version": "16.8.1a",
                            "status": "affected"
                        },
                        {
                            "version": "16.8.1s",
                            "status": "affected"
                        },
                        {
                            "version": "16.9.1",
                            "status": "affected"
                        },
                        {
                            "version": "16.9.2",
                            "status": "affected"
                        },
                        {
                            "version": "16.9.1s",
                            "status": "affected"
                        },
                        {
                            "version": "16.9.3",
                            "status": "affected"
                        },
                        {
                            "version": "16.9.4",
                            "status": "affected"
                        },
                        {
                            "version": "16.9.5",
                            "status": "affected"
                        },
                        {
                            "version": "16.9.6",
                            "status": "affected"
                        },
                        {
                            "version": "16.9.7",
                            "status": "affected"
                        },
                        {
                            "version": "16.9.8",
                            "status": "affected"
                        },
                        {
                            "version": "16.10.1",
                            "status": "affected"
                        },
                        {
                            "version": "16.10.1s",
                            "status": "affected"
                        },
                        {
                            "version": "16.10.1e",
                            "status": "affected"
                        },
                        {
                            "version": "16.11.1",
                            "status": "affected"
                        },
                        {
                            "version": "16.11.1b",
                            "status": "affected"
                        },
                        {
                            "version": "16.11.1s",
                            "status": "affected"
                        },
                        {
                            "version": "16.12.1",
                            "status": "affected"
                        },
                        {
                            "version": "16.12.1s",
                            "status": "affected"
                        },
                        {
                            "version": "16.12.1c",
                            "status": "affected"
                        },
                        {
                            "version": "16.12.2",
                            "status": "affected"
                        },
                        {
                            "version": "16.12.3",
                            "status": "affected"
                        },
                        {
                            "version": "16.12.8",
                            "status": "affected"
                        },
                        {
                            "version": "16.12.2s",
                            "status": "affected"
                        },
                        {
                            "version": "16.12.4",
                            "status": "affected"
                        },
                        {
                            "version": "16.12.3s",
                            "status": "affected"
                        },
                        {
                            "version": "16.12.3a",
                            "status": "affected"
                        },
                        {
                            "version": "16.12.4a",
                            "status": "affected"
                        },
                        {
                            "version": "16.12.5",
                            "status": "affected"
                        },
                        {
                            "version": "16.12.6",
                            "status": "affected"
                        },
                        {
                            "version": "16.12.5b",
                            "status": "affected"
                        },
                        {
                            "version": "16.12.6a",
                            "status": "affected"
                        },
                        {
                            "version": "16.12.7",
                            "status": "affected"
                        },
                        {
                            "version": "17.1.1",
                            "status": "affected"
                        },
                        {
                            "version": "17.1.1s",
                            "status": "affected"
                        },
                        {
                            "version": "17.1.1t",
                            "status": "affected"
                        },
                        {
                            "version": "17.1.3",
                            "status": "affected"
                        },
                        {
                            "version": "17.2.1",
                            "status": "affected"
                        },
                        {
                            "version": "17.2.1a",
                            "status": "affected"
                        },
                        {
                            "version": "17.3.1",
                            "status": "affected"
                        },
                        {
                            "version": "17.3.2",
                            "status": "affected"
                        },
                        {
                            "version": "17.3.3",
                            "status": "affected"
                        },
                        {
                            "version": "17.3.2a",
                            "status": "affected"
                        },
                        {
                            "version": "17.3.4",
                            "status": "affected"
                        },
                        {
                            "version": "17.3.5",
                            "status": "affected"
                        },
                        {
                            "version": "17.3.6",
                            "status": "affected"
                        },
                        {
                            "version": "17.3.7",
                            "status": "affected"
                        },
                        {
                            "version": "17.3.8",
                            "status": "affected"
                        },
                        {
                            "version": "17.3.8a",
                            "status": "affected"
                        },
                        {
                            "version": "17.4.1",
                            "status": "affected"
                        },
                        {
                            "version": "17.5.1",
                            "status": "affected"
                        },
                        {
                            "version": "17.6.1",
                            "status": "affected"
                        },
                        {
                            "version": "17.6.2",
                            "status": "affected"
                        },
                        {
                            "version": "17.6.3",
                            "status": "affected"
                        },
                        {
                            "version": "17.6.1y",
                            "status": "affected"
                        },
                        {
                            "version": "17.6.4",
                            "status": "affected"
                        },
                        {
                            "version": "17.6.5",
                            "status": "affected"
                        },
                        {
                            "version": "17.6.6",
                            "status": "affected"
                        },
                        {
                            "version": "17.6.6a",
                            "status": "affected"
                        },
                        {
                            "version": "17.6.5a",
                            "status": "affected"
                        },
                        {
                            "version": "17.6.7",
                            "status": "affected"
                        },
                        {
                            "version": "17.6.8",
                            "status": "affected"
                        },
                        {
                            "version": "17.7.1",
                            "status": "affected"
                        },
                        {
                            "version": "17.10.1",
                            "status": "affected"
                        },
                        {
                            "version": "17.10.1b",
                            "status": "affected"
                        },
                        {
                            "version": "17.8.1",
                            "status": "affected"
                        },
                        {
                            "version": "17.9.1",
                            "status": "affected"
                        },
                        {
                            "version": "17.9.2",
                            "status": "affected"
                        },
                        {
                            "version": "17.9.3",
                            "status": "affected"
                        },
                        {
                            "version": "17.9.4",
                            "status": "affected"
                        },
                        {
                            "version": "17.9.5",
                            "status": "affected"
                        },
                        {
                            "version": "17.9.4a",
                            "status": "affected"
                        },
                        {
                            "version": "17.9.6",
                            "status": "affected"
                        },
                        {
                            "version": "17.9.6a",
                            "status": "affected"
                        },
                        {
                            "version": "17.9.7",
                            "status": "affected"
                        },
                        {
                            "version": "17.9.8",
                            "status": "affected"
                        },
                        {
                            "version": "17.11.1",
                            "status": "affected"
                        },
                        {
                            "version": "17.12.1",
                            "status": "affected"
                        },
                        {
                            "version": "17.12.2",
                            "status": "affected"
                        },
                        {
                            "version": "17.12.3",
                            "status": "affected"
                        },
                        {
                            "version": "17.12.4",
                            "status": "affected"
                        },
                        {
                            "version": "17.12.5",
                            "status": "affected"
                        },
                        {
                            "version": "17.12.1z5",
                            "status": "affected"
                        },
                        {
                            "version": "17.13.1",
                            "status": "affected"
                        },
                        {
                            "version": "17.14.1",
                            "status": "affected"
                        },
                        {
                            "version": "17.15.1",
                            "status": "affected"
                        },
                        {
                            "version": "17.15.2",
                            "status": "affected"
                        },
                        {
                            "version": "17.15.3",
                            "status": "affected"
                        },
                        {
                            "version": "17.15.2b",
                            "status": "affected"
                        },
                        {
                            "version": "17.15.4",
                            "status": "affected"
                        },
                        {
                            "version": "17.15.4d",
                            "status": "affected"
                        },
                        {
                            "version": "17.16.1",
                            "status": "affected"
                        },
                        {
                            "version": "17.17.1",
                            "status": "affected"
                        },
                        {
                            "version": "17.18.1",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "description": "Uncontrolled Resource Consumption",
                            "type": "cwe",
                            "cweId": "CWE-400"
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-bootp-WuBhNBxA",
                    "name": "cisco-sa-bootp-WuBhNBxA"
                }
            ],
            "metrics": [
                {
                    "format": "cvssV3_1",
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
                        "baseScore": 8.6,
                        "baseSeverity": "HIGH",
                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "privilegesRequired": "NONE",
                        "userInteraction": "NONE",
                        "scope": "CHANGED",
                        "confidentialityImpact": "NONE",
                        "integrityImpact": "NONE",
                        "availabilityImpact": "HIGH"
                    }
                }
            ],
            "exploits": [
                {
                    "lang": "en",
                    "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."
                }
            ],
            "source": {
                "advisory": "cisco-sa-bootp-WuBhNBxA",
                "discovery": "EXTERNAL",
                "defects": [
                    "CSCwq07617"
                ]
            }
        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-03-26T17:35:41.843290Z",
                                "id": "CVE-2026-20084",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "yes"
                                    },
                                    {
                                        "Technical Impact": "partial"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-03-26T17:35:50.008Z"
                }
            }
        ]
    }
}