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CVE-2009-4086

Status: ModifiedMedium (5)—

CRLF injection vulnerability in Xerver HTTP Server 4.31 and 4.32 allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via certain byte sequences at the end of a URL. NOTE: some of these details are obtained from third party information.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (1)

Javascript — Xerver Http Server

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2009-4086",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:N",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
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  },
  "affected": [
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      "affectedData": [
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  ],
  "published": "2009-11-29T13:07:34.797",
  "references": [
    {
      "url": "http://packetstormsecurity.org/0911-exploits/xerver-split.txt",
      "tags": [
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      "source": "cve@mitre.org"
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      "tags": [
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      "source": "cve@mitre.org"
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      "tags": [
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      "source": "cve@mitre.org"
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    {
      "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/54356",
      "source": "cve@mitre.org"
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      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  ],
  "vulnStatus": "Modified",
  "weaknesses": [
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      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
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          "lang": "en",
          "value": "CWE-20"
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      ]
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "CRLF injection vulnerability in Xerver HTTP Server 4.31 and 4.32 allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via certain byte sequences at the end of a URL.  NOTE: some of these details are obtained from third party information."
    },
    {
      "lang": "es",
      "value": "Vulnerabilidad de inyección CRLF (se refiere a CR (retorno de carro) y LF (salto de línea)) en Xerver HTTP Server v4.31 y v4.32 permite a atacantes remotos inyectar cabeceras HTTP a su elección y llevar a cabo ataques de separación de respuesta HTTP a través de cierta secuencia de bytes en el final de una URL. NOTA: algunos de estos detalles se han obtenido de información de terceros."
    }
  ],
  "lastModified": "2026-06-16T23:13:00.583",
  "configurations": [
    {
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        {
          "negate": false,
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            },
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              "vulnerable": true,
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          "operator": "OR"
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  "sourceIdentifier": "cve@mitre.org"
}