{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2025-12642",
        "assignerOrgId": "1c6b5737-9389-4011-8117-89fa251edfb2",
        "state": "PUBLISHED",
        "assignerShortName": "Toreon",
        "dateReserved": "2025-11-03T19:34:17.666Z",
        "datePublished": "2025-11-03T19:36:17.011Z",
        "dateUpdated": "2025-11-03T19:44:09.174Z"
    },
    "containers": {
        "cna": {
            "affected": [
                {
                    "defaultStatus": "unaffected",
                    "modules": [
                        "mod_proxy"
                    ],
                    "packageName": "lighttpd1.4",
                    "product": "lighttpd",
                    "repo": "https://git.lighttpd.net/lighttpd/lighttpd1.4",
                    "vendor": "lighttpd",
                    "versions": [
                        {
                            "lessThan": "1.4.81",
                            "status": "affected",
                            "version": "1.4.80",
                            "versionType": "custom"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "cpeMatch": [
                                {
                                    "criteria": "cpe:2.3:a:lighttpd:lighttpd:*:*:*:*:*:*:*:*",
                                    "versionEndExcluding": "1.4.81",
                                    "versionStartIncluding": "1.4.80",
                                    "vulnerable": true
                                }
                            ],
                            "negate": false,
                            "operator": "OR"
                        }
                    ],
                    "operator": "OR"
                }
            ],
            "credits": [
                {
                    "lang": "en",
                    "type": "finder",
                    "value": "Sebastiano Sartor <@sebsrt>"
                }
            ],
            "descriptions": [
                {
                    "lang": "en",
                    "supportingMedia": [
                        {
                            "base64": false,
                            "type": "text/html",
                            "value": "<p>lighttpd1.4.80 incorrectly merged trailer fields into headers&nbsp;after http request parsing. This behavior can be exploited to conduct HTTP Header Smuggling attacks.</p><p>Successful exploitation may allow an attacker to:</p><ul><li>Bypass access control rules</li><li>Inject unsafe input into backend logic that trusts request headers</li><li>Execute HTTP Request Smuggling attacks under some conditions</li></ul><p>This issue affects lighttpd1.4.80</p>"
                        }
                    ],
                    "value": "lighttpd1.4.80 incorrectly merged trailer fields into headers after http request parsing. This behavior can be exploited to conduct HTTP Header Smuggling attacks.\n\nSuccessful exploitation may allow an attacker to:\n\n  *  Bypass access control rules\n  *  Inject unsafe input into backend logic that trusts request headers\n  *  Execute HTTP Request Smuggling attacks under some conditions\n\n\nThis issue affects lighttpd1.4.80"
                }
            ],
            "impacts": [
                {
                    "capecId": "CAPEC-554",
                    "descriptions": [
                        {
                            "lang": "en",
                            "value": "CAPEC-554 Functionality Bypass"
                        }
                    ]
                },
                {
                    "capecId": "CAPEC-33",
                    "descriptions": [
                        {
                            "lang": "en",
                            "value": "CAPEC-33 HTTP Request Smuggling"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV4_0": {
                        "Automatable": "NOT_DEFINED",
                        "Recovery": "NOT_DEFINED",
                        "Safety": "NOT_DEFINED",
                        "attackComplexity": "LOW",
                        "attackRequirements": "NONE",
                        "attackVector": "NETWORK",
                        "baseScore": 6.9,
                        "baseSeverity": "MEDIUM",
                        "exploitMaturity": "NOT_DEFINED",
                        "privilegesRequired": "NONE",
                        "providerUrgency": "NOT_DEFINED",
                        "subAvailabilityImpact": "NONE",
                        "subConfidentialityImpact": "NONE",
                        "subIntegrityImpact": "LOW",
                        "userInteraction": "NONE",
                        "valueDensity": "NOT_DEFINED",
                        "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N",
                        "version": "4.0",
                        "vulnAvailabilityImpact": "NONE",
                        "vulnConfidentialityImpact": "NONE",
                        "vulnIntegrityImpact": "NONE",
                        "vulnerabilityResponseEffort": "NOT_DEFINED"
                    },
                    "format": "CVSS",
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "GENERAL"
                        }
                    ]
                }
            ],
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-444",
                            "description": "CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')",
                            "lang": "en",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "1c6b5737-9389-4011-8117-89fa251edfb2",
                "shortName": "Toreon",
                "dateUpdated": "2025-11-03T19:36:17.011Z"
            },
            "references": [
                {
                    "url": "https://github.com/lighttpd/lighttpd1.4/commit/35cb89c103877de62d6b63d0804255475d77e5e1"
                }
            ],
            "source": {
                "discovery": "UNKNOWN"
            },
            "title": "HTTP Header Smuggling via Trailer Merge",
            "x_generator": {
                "engine": "Vulnogram 0.4.0"
            }
        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2025-11-03T19:43:55.914894Z",
                                "id": "CVE-2025-12642",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "yes"
                                    },
                                    {
                                        "Technical Impact": "partial"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2025-11-03T19:44:09.174Z"
                }
            }
        ]
    }
}