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CVE-2019-1970

Status: ModifiedHigh (7.5)—

A vulnerability in the Secure Sockets Layer (SSL)/Transport Layer Security (TLS) protocol inspection engine of Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass the configured file policies on an affected system. The vulnerability is due to errors when handling specific SSL/TLS messages. An attacker could exploit this vulnerability by sending crafted HTTP packets that would flow through an affected system. A successful exploit could allow the attacker to bypass the configured file policies and deliver a malicious payload to the protected network.

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 (2)

Cisco — Secure Firewall Management CenterCisco — Secure Firewall Threat Defense

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2019-1970",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2019-1970",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2024-11-19T17:23:28.922474Z"
        }
      }
    ],
    "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
      }
    ],
    "cvssMetricV30": [
      {
        "type": "Secondary",
        "source": "psirt@cisco.com",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.0",
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          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N",
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          "attackComplexity": "LOW",
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        },
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      {
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        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
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          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
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  },
  "affected": [
    {
      "source": "psirt@cisco.com",
      "affectedData": [
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          "vendor": "Cisco",
          "product": "Cisco Firepower Threat Defense Software",
          "versions": [
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              "version": "unspecified",
              "lessThan": "n/a",
              "versionType": "custom"
            }
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  ],
  "published": "2019-08-08T08:15:12.960",
  "references": [
    {
      "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190807-ftd-bypass",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "psirt@cisco.com"
    },
    {
      "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190807-ftd-bypass",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "psirt@cisco.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-693"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-693"
        }
      ]
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A vulnerability in the Secure Sockets Layer (SSL)/Transport Layer Security (TLS) protocol inspection engine of Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass the configured file policies on an affected system. The vulnerability is due to errors when handling specific SSL/TLS messages. An attacker could exploit this vulnerability by sending crafted HTTP packets that would flow through an affected system. A successful exploit could allow the attacker to bypass the configured file policies and deliver a malicious payload to the protected network."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad en el motor de inspección del protocolo Secure Sockets Layer (SSL)/Transport Layer Security (TLS) del software Firepower Threat Defense (FTD) de Cisco,  podría permitir a un atacante remoto no autenticado omitir las políticas de archivo configuradas en un sistema afectado. La vulnerabilidad es debido a errores cuando se manejan mensajes SSL/TLS específicos. Un atacante podría explotar esta vulnerabilidad enviando paquetes HTTP diseñados que fluirían por medio de un sistema afectado. Una explotación con éxito podría permitir al atacante omitir las políticas de archivos configuradas y entregar una carga maliciosa a la red protegida."
    }
  ],
  "lastModified": "2026-08-11T19:37:30.880",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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            },
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              "vulnerable": true,
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            },
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              "vulnerable": true,
              "matchCriteriaId": "116ED697-8508-466E-8146-81EFC20ECBCE",
              "versionEndExcluding": "6.4.1"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "psirt@cisco.com"
}