CVE-2025-12642

{
  "id": "CVE-2025-12642",
  "sourceIdentifier": "1c6b5737-9389-4011-8117-89fa251edfb2",
  "published": "2025-11-03T20:17:06.410",
  "lastModified": "2026-10-19T13:10:00.110",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "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"
    },
    {
      "lang": "es",
      "value": "lighttpd1.4.80 fusionó incorrectamente los campos de tráiler en los encabezados después del análisis de solicitudes HTTP. Este comportamiento puede ser explotado para llevar a cabo ataques de contrabando de encabezados HTTP.\n\nLa explotación exitosa puede permitir a un atacante:\n\n*   Eludir las reglas de control de acceso\n*   Inyectar entrada insegura en la lógica de backend que confía en los encabezados de solicitud\n*   Ejecutar ataques de contrabando de solicitudes HTTP bajo algunas condiciones\n\nEste problema afecta a lighttpd1.4.80"
    }
  ],
  "affected": [
    {
      "source": "1c6b5737-9389-4011-8117-89fa251edfb2",
      "affectedData": [
        {
          "vendor": "lighttpd",
          "product": "lighttpd",
          "defaultStatus": "unaffected",
          "packageName": "lighttpd1.4",
          "modules": [
            "mod_proxy"
          ],
          "repo": "https://git.lighttpd.net/lighttpd/lighttpd1.4",
          "versions": [
            {
              "version": "1.4.80",
              "lessThan": "1.4.81",
              "versionType": "custom",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV40": [
      {
        "source": "1c6b5737-9389-4011-8117-89fa251edfb2",
        "type": "Secondary",
        "cvssData": {
          "version": "4.0",
          "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "baseScore": 6.9,
          "baseSeverity": "MEDIUM",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "NONE",
          "vulnAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "LOW",
          "subAvailabilityImpact": "NONE",
          "exploitMaturity": "NOT_DEFINED",
          "confidentialityRequirement": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "valueDensity": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Primary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
          "baseScore": 9.1,
          "baseSeverity": "CRITICAL",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.2
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2025-11-03T19:43:55.914894Z",
          "id": "CVE-2025-12642",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "1c6b5737-9389-4011-8117-89fa251edfb2",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-444"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:lighttpd:lighttpd:1.4.80:*:*:*:*:*:*:*",
              "matchCriteriaId": "4858564C-9D52-43CB-80F3-2E90F71C05FF"
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  ],
  "references": [
    {
      "url": "https://github.com/lighttpd/lighttpd1.4/commit/35cb89c103877de62d6b63d0804255475d77e5e1",
      "source": "1c6b5737-9389-4011-8117-89fa251edfb2",
      "tags": [
        "Patch"
      ]
    }
  ]
}