« Back to list

CVE-2019-15703

Status: ModifiedHigh (7.5)—

An Insufficient Entropy in PRNG vulnerability in Fortinet FortiOS 6.2.1, 6.2.0, 6.0.8 and below for device not enable hardware TRNG token and models not support builtin TRNG seed allows attacker to theoretically recover the long term ECDSA secret in a TLS client with a RSA handshake and mutual ECDSA authentication via the help of flush+reload side channel attacks in FortiGate VM models only.

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)

Fortinet — Fortios

CWEs

References

Raw JSON (NVD)

Show
{
  "id": "CVE-2019-15703",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2019-15703",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2024-10-24T20:09:52.556651Z"
        }
      }
    ],
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 2.6,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:H/Au:N/C:P/I:N/A:N",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "HIGH",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "LOW",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 4.9,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "psirt@fortinet.com",
      "affectedData": [
        {
          "vendor": "Fortinet",
          "product": "Fortinet FortiOS",
          "versions": [
            {
              "status": "affected",
              "version": "6.2.1"
            },
            {
              "status": "affected",
              "version": "6.2.0"
            },
            {
              "status": "affected",
              "version": "6.0.8 and below"
            }
          ]
        }
      ]
    }
  ],
  "published": "2019-10-24T14:15:11.003",
  "references": [
    {
      "url": "https://fortiguard.com/psirt/FG-IR-19-186",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "psirt@fortinet.com"
    },
    {
      "url": "https://fortiguard.com/psirt/FG-IR-19-186",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-331"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "An Insufficient Entropy in PRNG vulnerability in Fortinet FortiOS 6.2.1, 6.2.0, 6.0.8 and below for device not enable hardware TRNG token and models not support builtin TRNG seed allows attacker to theoretically recover the long term ECDSA secret in a TLS client with a RSA handshake and mutual ECDSA authentication via the help of flush+reload side channel attacks in FortiGate VM models only."
    },
    {
      "lang": "es",
      "value": "Una Entropía Insuficiente en la vulnerabilidad del PRNG en Fortinet FortiOS versión 6.2.1, 6.2.0, 6.0.8 y posteriores, para dispositivos que no habilitan token TRNG de hardware y modelos que no admiten un seed TRNG incorporado permite al atacante recuperar teóricamente el secreto ECDSA a largo plazo en un cliente TLS con un protocolo de enlace RSA y autenticación mutua ECDSA mediante la ayuda de los ataques de canal lateral flush+reload solo en los modelos FortiGate VM."
    }
  ],
  "lastModified": "2026-06-17T02:20:54.313",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "9C424D53-2941-43BA-B4BA-FE6C06B08190",
              "versionEndIncluding": "5.6.9"
            },
            {
              "criteria": "cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "C2F4F708-941B-4EBD-9DAB-D726887B63DF",
              "versionEndExcluding": "6.0.9",
              "versionStartIncluding": "6.0.0"
            },
            {
              "criteria": "cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "7EE3901A-D32C-44DD-8977-87B4A4B6F3FE",
              "versionEndExcluding": "6.2.3",
              "versionStartIncluding": "6.2.0"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "psirt@fortinet.com"
}