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CVE-2018-0138

Status: ModifiedMedium (5.3)—

A vulnerability in the detection engine of Cisco Firepower System Software could allow an unauthenticated, remote attacker to bypass file policies that are configured to block files transmitted to an affected device via the BitTorrent protocol. The vulnerability exists because the affected software does not detect BitTorrent handshake messages correctly. An attacker could exploit this vulnerability by sending a crafted BitTorrent connection request to an affected device. A successful exploit could allow the attacker to bypass file policies that are configured to block files transmitted to the affected device via the BitTorrent protocol. Cisco Bug IDs: CSCve26946.

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)

Cisco — Secure Firewall Threat Defense

CWEs

References

Raw JSON (NVD)

Show
{
  "id": "CVE-2018-0138",
  "cveTags": [],
  "metrics": {
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          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
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          "version": "2.0.3",
          "timestamp": "2024-12-02T19:11:22.486785Z"
        }
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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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        "obtainUserPrivilege": false,
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    "cvssMetricV30": [
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  "weaknesses": [
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      "description": [
        {
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          "value": "CWE-693"
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      "description": [
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    {
      "lang": "en",
      "value": "A vulnerability in the detection engine of Cisco Firepower System Software could allow an unauthenticated, remote attacker to bypass file policies that are configured to block files transmitted to an affected device via the BitTorrent protocol. The vulnerability exists because the affected software does not detect BitTorrent handshake messages correctly. An attacker could exploit this vulnerability by sending a crafted BitTorrent connection request to an affected device. A successful exploit could allow the attacker to bypass file policies that are configured to block files transmitted to the affected device via the BitTorrent protocol. Cisco Bug IDs: CSCve26946."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad en el motor de detección de Cisco Firepower System Software podría permitir que un atacante remoto sin autenticar omita políticas de archivos que estén configuradas para bloquear archivos transmitidos a un dispositivo afectado mediante el protocolo BitTorrent. La vulnerabilidad existe debido a que el software afectado no detecta correctamente los mensajes del handshake de BitTorrent. Un atacante podría explotar esta vulnerabilidad enviando una petición de conexión BitTorrent manipulada a un dispositivo afectado. Un exploit con éxito podría permitir que un atacante remoto sin autenticar omita políticas de archivos que estén configuradas para bloquear archivos transmitidos a un dispositivo afectado mediante el protocolo BitTorrent. Cisco Bug IDs: CSCve26946."
    }
  ],
  "lastModified": "2026-08-11T19:33:44.513",
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  "sourceIdentifier": "psirt@cisco.com"
}