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CVE-2017-7521

Status: ModifiedMedium (5.9)—

OpenVPN versions before 2.4.3 and before 2.3.17 are vulnerable to remote denial-of-service due to memory exhaustion caused by memory leaks and double-free issue in extract_x509_extension().

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)

Openvpn — Openvpn

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2017-7521",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 4.3,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV30": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.0",
          "baseScore": 5.9,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 2.2
      }
    ]
  },
  "affected": [
    {
      "source": "secalert@redhat.com",
      "affectedData": [
        {
          "vendor": "OpenVPN Technologies, Inc",
          "product": "OpenVPN",
          "versions": [
            {
              "status": "affected",
              "version": "before 2.4.3"
            },
            {
              "status": "affected",
              "version": "before 2.3.17"
            }
          ]
        }
      ]
    }
  ],
  "published": "2017-06-27T13:29:00.240",
  "references": [
    {
      "url": "http://www.debian.org/security/2017/dsa-3900",
      "source": "secalert@redhat.com"
    },
    {
      "url": "http://www.securityfocus.com/bid/99230",
      "tags": [
        "Third Party Advisory",
        "VDB Entry"
      ],
      "source": "secalert@redhat.com"
    },
    {
      "url": "http://www.securitytracker.com/id/1038768",
      "source": "secalert@redhat.com"
    },
    {
      "url": "https://community.openvpn.net/openvpn/wiki/VulnerabilitiesFixedInOpenVPN243",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "secalert@redhat.com"
    },
    {
      "url": "http://www.debian.org/security/2017/dsa-3900",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.securityfocus.com/bid/99230",
      "tags": [
        "Third Party Advisory",
        "VDB Entry"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.securitytracker.com/id/1038768",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://community.openvpn.net/openvpn/wiki/VulnerabilitiesFixedInOpenVPN243",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "secalert@redhat.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-400"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-415"
        },
        {
          "lang": "en",
          "value": "CWE-772"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "OpenVPN versions before 2.4.3 and before 2.3.17 are vulnerable to remote denial-of-service due to memory exhaustion caused by memory leaks and double-free issue in extract_x509_extension()."
    },
    {
      "lang": "es",
      "value": "Las versiones de OpenVPN anteriores a 2.4.3 y 2.3.17, son vulnerables a una denegación de servicio remota debido a un agotamiento de memoria causado por pérdida de memoria y un problema de doble liberación (Double Free) en la función extract_x509_extension()."
    }
  ],
  "lastModified": "2026-06-17T01:24:31.153",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:openvpn:openvpn:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "216840B9-FCDB-4921-BE12-2A1FA42F8FDE",
              "versionEndIncluding": "2.3.16"
            },
            {
              "criteria": "cpe:2.3:a:openvpn:openvpn:2.4.0:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "84F5C67A-34A4-4C7E-BCA9-AF3E5FC70AF6"
            },
            {
              "criteria": "cpe:2.3:a:openvpn:openvpn:2.4.0:alpha2:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "A857CA88-60B0-4D34-87B6-770B67981501"
            },
            {
              "criteria": "cpe:2.3:a:openvpn:openvpn:2.4.0:beta1:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "B42297EE-B347-4BD8-A657-BDF0AA010C06"
            },
            {
              "criteria": "cpe:2.3:a:openvpn:openvpn:2.4.0:beta2:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "7C7A56E8-09C8-4DB2-9244-9E5E2BEC1821"
            },
            {
              "criteria": "cpe:2.3:a:openvpn:openvpn:2.4.0:rc1:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "41ACD637-EF6B-40E4-BDE6-0EE7D6AEBAD4"
            },
            {
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              "vulnerable": true,
              "matchCriteriaId": "1A4150AD-3F46-487D-BCF8-79D0AE2A092D"
            },
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              "criteria": "cpe:2.3:a:openvpn:openvpn:2.4.1:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "E7F7663E-3EB5-44F4-B7DE-294A549A12BE"
            },
            {
              "criteria": "cpe:2.3:a:openvpn:openvpn:2.4.2:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "81434C3E-F992-4F29-9092-6823989B6909"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "secalert@redhat.com"
}