{
    "CVE_data_meta": {
        "ASSIGNER": "cve@mitre.org",
        "ID": "CVE-2023-51766",
        "STATE": "PUBLIC"
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "product": {
                        "product_data": [
                            {
                                "product_name": "n/a",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_value": "n/a"
                                        }
                                    ]
                                }
                            }
                        ]
                    },
                    "vendor_name": "n/a"
                }
            ]
        }
    },
    "data_format": "MITRE",
    "data_type": "CVE",
    "data_version": "4.0",
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "Exim before 4.97.1 allows SMTP smuggling in certain PIPELINING/CHUNKING configurations. Remote attackers can use a published exploitation technique to inject e-mail messages with a spoofed MAIL FROM address, allowing bypass of an SPF protection mechanism. This occurs because Exim supports <LF>.<CR><LF> but some other popular e-mail servers do not."
            }
        ]
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "n/a"
                    }
                ]
            }
        ]
    },
    "references": {
        "reference_data": [
            {
                "url": "https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/",
                "refsource": "MISC",
                "name": "https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/"
            },
            {
                "url": "https://exim.org/static/doc/security/CVE-2023-51766.txt",
                "refsource": "MISC",
                "name": "https://exim.org/static/doc/security/CVE-2023-51766.txt"
            },
            {
                "url": "https://bugs.exim.org/show_bug.cgi?id=3063",
                "refsource": "MISC",
                "name": "https://bugs.exim.org/show_bug.cgi?id=3063"
            },
            {
                "url": "https://www.openwall.com/lists/oss-security/2023/12/23/2",
                "refsource": "MISC",
                "name": "https://www.openwall.com/lists/oss-security/2023/12/23/2"
            },
            {
                "refsource": "MLIST",
                "name": "[oss-security] 20231224 Re: Re: New SMTP smuggling attack",
                "url": "http://www.openwall.com/lists/oss-security/2023/12/24/1"
            },
            {
                "refsource": "MLIST",
                "name": "[oss-security] 20231225 Re: Re: New SMTP smuggling attack",
                "url": "http://www.openwall.com/lists/oss-security/2023/12/25/1"
            },
            {
                "refsource": "MISC",
                "name": "https://git.exim.org/exim.git/commit/5bb786d5ad568a88d50d15452aacc8404047e5ca",
                "url": "https://git.exim.org/exim.git/commit/5bb786d5ad568a88d50d15452aacc8404047e5ca"
            },
            {
                "refsource": "MISC",
                "name": "https://git.exim.org/exim.git/commit/cf1376206284f2a4f11e32d931d4aade34c206c5",
                "url": "https://git.exim.org/exim.git/commit/cf1376206284f2a4f11e32d931d4aade34c206c5"
            },
            {
                "refsource": "MISC",
                "name": "https://bugzilla.redhat.com/show_bug.cgi?id=2255852",
                "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2255852"
            },
            {
                "refsource": "MISC",
                "name": "https://fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.html",
                "url": "https://fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.html"
            },
            {
                "refsource": "MLIST",
                "name": "[oss-security] 20231229 CVE-2023-51766: Exim: SMTP smuggling",
                "url": "http://www.openwall.com/lists/oss-security/2023/12/29/2"
            },
            {
                "refsource": "CONFIRM",
                "name": "https://github.com/Exim/exim/blob/master/doc/doc-txt/cve-2023-51766",
                "url": "https://github.com/Exim/exim/blob/master/doc/doc-txt/cve-2023-51766"
            },
            {
                "refsource": "MLIST",
                "name": "[oss-security] 20240101 Re: CVE-2023-51766: Exim: SMTP smuggling",
                "url": "http://www.openwall.com/lists/oss-security/2024/01/01/1"
            },
            {
                "refsource": "MLIST",
                "name": "[oss-security] 20240101 Re: CVE-2023-51766: Exim: SMTP smuggling",
                "url": "http://www.openwall.com/lists/oss-security/2024/01/01/2"
            },
            {
                "refsource": "MLIST",
                "name": "[oss-security] 20240101 Re: CVE-2023-51766: Exim: SMTP smuggling",
                "url": "http://www.openwall.com/lists/oss-security/2024/01/01/3"
            },
            {
                "refsource": "MISC",
                "name": "https://www.youtube.com/watch?v=V8KPV96g1To",
                "url": "https://www.youtube.com/watch?v=V8KPV96g1To"
            },
            {
                "refsource": "MLIST",
                "name": "[debian-lts-announce] 20240105 [SECURITY] [DLA 3708-1] exim4 security update",
                "url": "https://lists.debian.org/debian-lts-announce/2024/01/msg00002.html"
            },
            {
                "refsource": "FEDORA",
                "name": "FEDORA-2024-1ef6197a49",
                "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QPDWHJPABVJCXDSNELSSVTIVAJU2MDUQ/"
            },
            {
                "refsource": "FEDORA",
                "name": "FEDORA-2024-e0841c83bb",
                "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ORN7OKEQPPBKUHYRQ6LR5PSNBQVDHAWB/"
            },
            {
                "refsource": "MISC",
                "name": "https://lwn.net/Articles/956533/",
                "url": "https://lwn.net/Articles/956533/"
            }
        ]
    }
}