{
    "CVE_data_meta": {
        "ASSIGNER": "productcert@siemens.com",
        "ID": "CVE-2020-27738",
        "STATE": "PUBLIC"
    },
    "data_format": "MITRE",
    "data_version": "4.0",
    "data_type": "CVE",
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "vendor_name": "Siemens",
                    "product": {
                        "product_data": [
                            {
                                "product_name": "Nucleus 4",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_value": "All versions < V4.1.0"
                                        }
                                    ]
                                }
                            },
                            {
                                "product_name": "Nucleus NET",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_value": "All versions"
                                        }
                                    ]
                                }
                            },
                            {
                                "product_name": "Nucleus RTOS",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_value": "versions including affected DNS modules"
                                        }
                                    ]
                                }
                            },
                            {
                                "product_name": "Nucleus ReadyStart",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_value": "All versions < V2017.02.3"
                                        }
                                    ]
                                }
                            },
                            {
                                "product_name": "Nucleus Source Code",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_value": "versions including affected DNS modules"
                                        }
                                    ]
                                }
                            },
                            {
                                "product_name": "SIMOTICS CONNECT 400",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_value": "All versions < V0.5.0.0"
                                        }
                                    ]
                                }
                            },
                            {
                                "product_name": "VSTAR",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_value": "versions including affected DNS modules"
                                        }
                                    ]
                                }
                            }
                        ]
                    }
                }
            ]
        }
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "CWE-788: Access of Memory Location After End of Buffer"
                    }
                ]
            }
        ]
    },
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "A vulnerability has been identified in Nucleus 4 (All versions < V4.1.0), Nucleus NET (All versions), Nucleus RTOS (versions including affected DNS modules), Nucleus ReadyStart (All versions < V2017.02.3), Nucleus Source Code (versions including affected DNS modules), SIMOTICS CONNECT 400 (All versions < V0.5.0.0), VSTAR (versions including affected DNS modules). The DNS domain name record decompression functionality does not properly validate the pointer offset values. The parsing of malformed responses could result in a read access past the end of an allocated structure. An attacker with a privileged position in the network could leverage this vulnerability to cause a denial-of-service condition."
            }
        ]
    },
    "references": {
        "reference_data": [
            {
                "refsource": "MISC",
                "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-705111.pdf",
                "name": "https://cert-portal.siemens.com/productcert/pdf/ssa-705111.pdf"
            },
            {
                "refsource": "MISC",
                "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-669158.pdf",
                "name": "https://cert-portal.siemens.com/productcert/pdf/ssa-669158.pdf"
            }
        ]
    }
}