{
    "CVE_data_meta": {
        "ASSIGNER": "security@apache.org",
        "ID": "CVE-2021-44224",
        "STATE": "PUBLIC",
        "TITLE": "Possible NULL dereference or SSRF in forward proxy configurations in Apache HTTP Server 2.4.51 and earlier"
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "product": {
                        "product_data": [
                            {
                                "product_name": "Apache HTTP Server",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": ">=",
                                            "version_name": "Apache HTTP Server 2.4",
                                            "version_value": "2.4.7"
                                        },
                                        {
                                            "version_affected": "<=",
                                            "version_name": "Apache HTTP Server 2.4",
                                            "version_value": "2.4.51"
                                        }
                                    ]
                                }
                            }
                        ]
                    },
                    "vendor_name": "Apache Software Foundation"
                }
            ]
        }
    },
    "credit": [
        {
            "lang": "eng",
            "value": "\u6f02\u4eae\u9f20"
        },
        {
            "lang": "eng",
            "value": "TengMA(@Te3t123)"
        }
    ],
    "data_format": "MITRE",
    "data_type": "CVE",
    "data_version": "4.0",
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "A crafted URI sent to httpd configured as a forward proxy (ProxyRequests on) can cause a crash (NULL pointer dereference) or, for configurations mixing forward and reverse proxy declarations, can allow for requests to be directed to a declared Unix Domain Socket endpoint (Server Side Request Forgery). This issue affects Apache HTTP Server 2.4.7 up to 2.4.51 (included)."
            }
        ]
    },
    "generator": {
        "engine": "Vulnogram 0.0.9"
    },
    "impact": [
        {
            "other": "moderate"
        }
    ],
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "CWE-476 NULL Pointer Dereference"
                    }
                ]
            }
        ]
    },
    "references": {
        "reference_data": [
            {
                "refsource": "MISC",
                "url": "http://httpd.apache.org/security/vulnerabilities_24.html",
                "name": "http://httpd.apache.org/security/vulnerabilities_24.html"
            },
            {
                "refsource": "MLIST",
                "name": "[oss-security] 20211220 CVE-2021-44224: Apache HTTP Server: Possible NULL dereference or SSRF in forward proxy configurations in Apache HTTP Server 2.4.51 and earlier",
                "url": "http://www.openwall.com/lists/oss-security/2021/12/20/3"
            },
            {
                "refsource": "FEDORA",
                "name": "FEDORA-2021-29a536c2ae",
                "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BFSWOH4X77CV7AH7C4RMHUBDWKQDL4YH/"
            },
            {
                "refsource": "DEBIAN",
                "name": "DSA-5035",
                "url": "https://www.debian.org/security/2022/dsa-5035"
            },
            {
                "url": "https://www.oracle.com/security-alerts/cpujan2022.html",
                "refsource": "MISC",
                "name": "https://www.oracle.com/security-alerts/cpujan2022.html"
            },
            {
                "refsource": "CONFIRM",
                "name": "https://security.netapp.com/advisory/ntap-20211224-0001/",
                "url": "https://security.netapp.com/advisory/ntap-20211224-0001/"
            },
            {
                "refsource": "CONFIRM",
                "name": "https://www.tenable.com/security/tns-2022-01",
                "url": "https://www.tenable.com/security/tns-2022-01"
            },
            {
                "refsource": "CONFIRM",
                "name": "https://www.tenable.com/security/tns-2022-03",
                "url": "https://www.tenable.com/security/tns-2022-03"
            },
            {
                "refsource": "FEDORA",
                "name": "FEDORA-2022-b4103753e9",
                "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RGWILBORT67SHMSLYSQZG2NMXGCMPUZO/"
            },
            {
                "refsource": "FEDORA",
                "name": "FEDORA-2022-21264ec6db",
                "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/Z7H26WJ6TPKNWV3QKY4BHKUKQVUTZJTD/"
            },
            {
                "refsource": "FEDORA",
                "name": "FEDORA-2022-78e3211c55",
                "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/X73C35MMMZGBVPQQCH7LQZUMYZNQA5FO/"
            },
            {
                "url": "https://www.oracle.com/security-alerts/cpuapr2022.html",
                "refsource": "MISC",
                "name": "https://www.oracle.com/security-alerts/cpuapr2022.html"
            },
            {
                "refsource": "CONFIRM",
                "name": "https://support.apple.com/kb/HT213257",
                "url": "https://support.apple.com/kb/HT213257"
            },
            {
                "refsource": "CONFIRM",
                "name": "https://support.apple.com/kb/HT213256",
                "url": "https://support.apple.com/kb/HT213256"
            },
            {
                "refsource": "CONFIRM",
                "name": "https://support.apple.com/kb/HT213255",
                "url": "https://support.apple.com/kb/HT213255"
            },
            {
                "refsource": "FULLDISC",
                "name": "20220516 APPLE-SA-2022-05-16-4 Security Update 2022-004 Catalina",
                "url": "http://seclists.org/fulldisclosure/2022/May/33"
            },
            {
                "refsource": "FULLDISC",
                "name": "20220516 APPLE-SA-2022-05-16-3 macOS Big Sur 11.6.6",
                "url": "http://seclists.org/fulldisclosure/2022/May/35"
            },
            {
                "refsource": "FULLDISC",
                "name": "20220516 APPLE-SA-2022-05-16-2 macOS Monterey 12.4",
                "url": "http://seclists.org/fulldisclosure/2022/May/38"
            },
            {
                "refsource": "GENTOO",
                "name": "GLSA-202208-20",
                "url": "https://security.gentoo.org/glsa/202208-20"
            }
        ]
    },
    "source": {
        "discovery": "UNKNOWN"
    },
    "timeline": [
        {
            "lang": "eng",
            "time": "2021-11-18",
            "value": "Reported to security team"
        },
        {
            "lang": "eng",
            "time": "2021-12-14",
            "value": "fixed by r1895955+r1896044 in 2.4.x"
        }
    ]
}