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CVE-2019-18625

Estado: ModificadaAlta (7.5)—

An issue was discovered in Suricata 5.0.0. It was possible to bypass/evade any tcp based signature by faking a closed TCP session using an evil server. After the TCP SYN packet, it is possible to inject a RST ACK and a FIN ACK packet with a bad TCP Timestamp option. The client will ignore the RST ACK and the FIN ACK packets because of the bad TCP Timestamp option. Both linux and windows client are ignoring the injected packets.

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 LinuxOisf — Suricata

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2019-18625",
  "cveTags": [],
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          "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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        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
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        "impactScore": 3.6,
        "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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  "published": "2020-01-06T21:15:11.427",
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  "vulnStatus": "Modified",
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  "descriptions": [
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      "value": "An issue was discovered in Suricata 5.0.0. It was possible to bypass/evade any tcp based signature by faking a closed TCP session using an evil server. After the TCP SYN packet, it is possible to inject a RST ACK and a FIN ACK packet with a bad TCP Timestamp option. The client will ignore the RST ACK and the FIN ACK packets because of the bad TCP Timestamp option. Both linux and windows client are ignoring the injected packets."
    },
    {
      "lang": "es",
      "value": "Se descubrió un problema en Suricata versión 5.0.0. Fue posible omitir y evadir cualquier firma basada en tcp falsificando una sesión TCP cerrada usando un servidor malicioso. Después del paquete TCP SYN, es posible inyectar un paquete RST ACK y un paquete FIN ACK con una opción TCP Timestamp errada. El cliente ignorará los paquetes RST ACK y FIN ACK debido a la opción TCP Timestamp errada. Tanto el cliente de Linux y Windows ignoran los paquetes inyectados"
    }
  ],
  "lastModified": "2026-06-17T02:25:10.913",
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}