{
    "data_version": "4.0",
    "data_type": "CVE",
    "data_format": "MITRE",
    "CVE_data_meta": {
        "ID": "CVE-2021-26858",
        "ASSIGNER": "secure@microsoft.com",
        "STATE": "PUBLIC"
    },
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "Microsoft Exchange Server Remote Code Execution Vulnerability"
            }
        ]
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "Remote Code Execution"
                    }
                ]
            }
        ]
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "vendor_name": "Microsoft",
                    "product": {
                        "product_data": [
                            {
                                "product_name": "Microsoft Exchange Server 2019",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "15.02.0",
                                            "version_value": "publication"
                                        }
                                    ]
                                }
                            },
                            {
                                "product_name": "Microsoft Exchange Server 2013 Cumulative Update 22",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "15.00.0",
                                            "version_value": "publication"
                                        }
                                    ]
                                }
                            },
                            {
                                "product_name": "Microsoft Exchange Server 2019 Cumulative Update 2",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "15.02.0",
                                            "version_value": "publication"
                                        }
                                    ]
                                }
                            },
                            {
                                "product_name": "Microsoft Exchange Server 2016 Cumulative Update 13",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "15.01.0",
                                            "version_value": "publication"
                                        }
                                    ]
                                }
                            },
                            {
                                "product_name": "Microsoft Exchange Server 2013 Cumulative Update 23",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "15.00.0",
                                            "version_value": "publication"
                                        }
                                    ]
                                }
                            },
                            {
                                "product_name": "Microsoft Exchange Server 2019 Cumulative Update 3",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "15.02.0",
                                            "version_value": "publication"
                                        }
                                    ]
                                }
                            },
                            {
                                "product_name": "Microsoft Exchange Server 2016 Cumulative Update 14",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "15.01.0",
                                            "version_value": "publication"
                                        }
                                    ]
                                }
                            },
                            {
                                "product_name": "Microsoft Exchange Server 2019 Cumulative Update 4",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "15.02.0",
                                            "version_value": "publication"
                                        }
                                    ]
                                }
                            },
                            {
                                "product_name": "Microsoft Exchange Server 2016 Cumulative Update 15",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "15.01.0",
                                            "version_value": "publication"
                                        }
                                    ]
                                }
                            },
                            {
                                "product_name": "Microsoft Exchange Server 2019 Cumulative Update 5",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "15.02.0",
                                            "version_value": "publication"
                                        }
                                    ]
                                }
                            },
                            {
                                "product_name": "Microsoft Exchange Server 2019 Cumulative Update 6",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "15.02.0",
                                            "version_value": "publication"
                                        }
                                    ]
                                }
                            },
                            {
                                "product_name": "Microsoft Exchange Server 2016 Cumulative Update 16",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "15.01.0",
                                            "version_value": "publication"
                                        }
                                    ]
                                }
                            },
                            {
                                "product_name": "Microsoft Exchange Server 2016 Cumulative Update 17",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "15.01.0",
                                            "version_value": "publication"
                                        }
                                    ]
                                }
                            },
                            {
                                "product_name": "Microsoft Exchange Server 2019 Cumulative Update 7",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "15.02.0",
                                            "version_value": "publication"
                                        }
                                    ]
                                }
                            },
                            {
                                "product_name": "Microsoft Exchange Server 2016 Cumulative Update 18",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "15.01.0",
                                            "version_value": "publication"
                                        }
                                    ]
                                }
                            },
                            {
                                "product_name": "Microsoft Exchange Server 2016 Cumulative Update 19",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "15.01.0",
                                            "version_value": "publication"
                                        }
                                    ]
                                }
                            },
                            {
                                "product_name": "Microsoft Exchange Server 2019 Cumulative Update 8",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "15.02.0",
                                            "version_value": "publication"
                                        }
                                    ]
                                }
                            },
                            {
                                "product_name": "Microsoft Exchange Server 2013 Cumulative Update 21",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "15.00.0",
                                            "version_value": "publication"
                                        }
                                    ]
                                }
                            },
                            {
                                "product_name": "Microsoft Exchange Server 2016 Cumulative Update 12",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "15.01.0",
                                            "version_value": "publication"
                                        }
                                    ]
                                }
                            },
                            {
                                "product_name": "Microsoft Exchange Server 2016 Cumulative Update 8",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "15.01.0",
                                            "version_value": "publication"
                                        }
                                    ]
                                }
                            },
                            {
                                "product_name": "Microsoft Exchange Server 2019 Cumulative Update 1",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "15.02.0",
                                            "version_value": "publication"
                                        }
                                    ]
                                }
                            },
                            {
                                "product_name": "Microsoft Exchange Server 2016 Cumulative Update 9",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "15.01.0",
                                            "version_value": "publication"
                                        }
                                    ]
                                }
                            },
                            {
                                "product_name": "Microsoft Exchange Server 2016 Cumulative Update 10",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "15.01.0",
                                            "version_value": "publication"
                                        }
                                    ]
                                }
                            },
                            {
                                "product_name": "Microsoft Exchange Server 2016 Cumulative Update 11",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "15.01.0",
                                            "version_value": "publication"
                                        }
                                    ]
                                }
                            }
                        ]
                    }
                }
            ]
        }
    },
    "references": {
        "reference_data": [
            {
                "url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26858",
                "refsource": "MISC",
                "name": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26858"
            }
        ]
    },
    "impact": {
        "cvss": [
            {
                "version": "3.1",
                "baseSeverity": "HIGH",
                "baseScore": 7.8,
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C"
            }
        ]
    }
}