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CVE-2018-6794

Estado: ModificadaMedia (5.3)—

Suricata before 4.0.4 is prone to an HTTP detection bypass vulnerability in detect.c and stream-tcp.c. If a malicious server breaks a normal TCP flow and sends data before the 3-way handshake is complete, then the data sent by the malicious server will be accepted by web clients such as a web browser or Linux CLI utilities, but ignored by Suricata IDS signatures. This mostly affects IDS signatures for the HTTP protocol and TCP stream content; signatures for TCP packets will inspect such network traffic as usual.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (2)

Debian — Debian LinuxSuricata-ids — Suricata

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2018-6794",
  "cveTags": [],
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          "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"
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        "obtainAllPrivilege": false,
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          "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
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        "exploitabilityScore": 3.9
      }
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  "affected": [
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      "affectedData": [
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          "vendor": "n/a",
          "product": "n/a",
          "versions": [
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              "status": "affected",
              "version": "n/a"
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  "published": "2018-02-07T05:29:00.260",
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  "vulnStatus": "Modified",
  "weaknesses": [
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      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-693"
        }
      ]
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Suricata before 4.0.4 is prone to an HTTP detection bypass vulnerability in detect.c and stream-tcp.c. If a malicious server breaks a normal TCP flow and sends data before the 3-way handshake is complete, then the data sent by the malicious server will be accepted by web clients such as a web browser or Linux CLI utilities, but ignored by Suricata IDS signatures. This mostly affects IDS signatures for the HTTP protocol and TCP stream content; signatures for TCP packets will inspect such network traffic as usual."
    },
    {
      "lang": "es",
      "value": "Suricata en versiones anteriores a la 4.0.4 es propenso a una vulnerabilidad de omisión de detección HTTP en detect.c y stream-tcp.c. Si un servidor malicioso interrumpe un flujo TCP normal y envía datos antes de que se complete el handshake tridireccional, los datos enviados por el servidor malicioso se aceptarán por parte de clientes web como el navegador web o herramientas de interfaz de línea de comandos de Linux, pero las firmas IDS de Suricata los ignorarán. Esto afecta a la mayoría de firmas IDS para el contenido del flujo TCP y los protocolos HTTP. Las firmas para los paquetes TCP inspeccionarán ese tráfico de red como de costumbre."
    }
  ],
  "lastModified": "2026-06-17T02:02:17.767",
  "configurations": [
    {
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}