{
    "data_version": "4.0",
    "data_type": "CVE",
    "data_format": "MITRE",
    "CVE_data_meta": {
        "ID": "CVE-2024-20266",
        "ASSIGNER": "psirt@cisco.com",
        "STATE": "PUBLIC"
    },
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "A vulnerability in the DHCP version 4 (DHCPv4) server feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to trigger a crash of the dhcpd process, resulting in a denial of service (DoS) condition.\r\n\r This vulnerability exists because certain DHCPv4 messages are improperly validated when they are processed by an affected device. An attacker could exploit this vulnerability by sending a malformed DHCPv4 message to an affected device. A successful exploit could allow the attacker to cause a crash of the dhcpd process. While the dhcpd process is restarting, which may take approximately two minutes, DHCPv4 server services are unavailable on the affected device. This could temporarily prevent network access to clients that join the network during that time period and rely on the DHCPv4 server of the affected device.\r\n\r Notes: \r\n\r \r Only the dhcpd process crashes and eventually restarts automatically. The router does not reload.\r This vulnerability only applies to DHCPv4. DHCP version 6 (DHCPv6) is not affected."
            }
        ]
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "NULL Pointer Dereference",
                        "cweId": "CWE-476"
                    }
                ]
            }
        ]
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "vendor_name": "Cisco",
                    "product": {
                        "product_data": [
                            {
                                "product_name": "Cisco IOS XR Software",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "=",
                                            "version_value": "5.2.0"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "5.2.1"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "5.2.2"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "5.2.4"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "5.2.3"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "5.2.5"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "5.2.47"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "5.3.0"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "5.3.1"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "5.3.2"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "5.3.3"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "5.3.4"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "6.0.0"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "6.0.1"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "6.0.2"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "6.1.1"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "6.1.2"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "6.1.3"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "6.1.4"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "6.1.12"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "6.1.22"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "6.1.32"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "6.1.36"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "6.1.42"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "6.2.1"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "6.2.2"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "6.2.3"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "6.2.25"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "6.2.11"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "6.3.2"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "6.3.3"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "6.3.15"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "6.4.1"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "6.4.2"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "6.4.3"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "6.5.1"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "6.5.2"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "6.5.3"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "6.5.25"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "6.5.26"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "6.5.28"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "6.5.29"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "6.5.32"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "6.5.33"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "6.6.2"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "6.6.3"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "6.6.25"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "6.6.4"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "7.0.1"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "7.0.2"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "7.0.12"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "7.0.14"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "7.1.1"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "7.1.15"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "7.1.2"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "7.1.3"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "6.7.1"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "6.7.2"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "6.7.3"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "6.7.4"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "7.2.0"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "7.2.1"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "7.2.2"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "7.3.1"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "7.3.15"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "7.3.2"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "7.3.3"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "7.3.5"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "7.4.1"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "7.4.2"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "6.8.1"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "6.8.2"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "7.5.1"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "7.5.3"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "7.5.2"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "7.5.4"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "7.5.5"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "7.6.1"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "7.6.2"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "7.7.1"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "7.7.2"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "7.7.21"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "6.9.1"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "6.9.2"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "7.8.1"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "7.8.2"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "7.9.1"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "7.9.2"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "7.9.21"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "7.10.1"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "7.10.2"
                                        }
                                    ]
                                }
                            }
                        ]
                    }
                }
            ]
        }
    },
    "references": {
        "reference_data": [
            {
                "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-dhcp-dos-3tgPKRdm",
                "refsource": "MISC",
                "name": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-dhcp-dos-3tgPKRdm"
            }
        ]
    },
    "source": {
        "advisory": "cisco-sa-iosxr-dhcp-dos-3tgPKRdm",
        "discovery": "INTERNAL",
        "defects": [
            "CSCwf83090"
        ]
    },
    "exploit": [
        {
            "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."
        }
    ],
    "impact": {
        "cvss": [
            {
                "version": "3.1",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
                "baseScore": 5.3,
                "baseSeverity": "MEDIUM",
                "attackVector": "NETWORK",
                "attackComplexity": "LOW",
                "privilegesRequired": "NONE",
                "userInteraction": "NONE",
                "scope": "UNCHANGED",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "availabilityImpact": "LOW"
            }
        ]
    }
}