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CVE-2000-0916

Status: ModifiedHigh (7.5)—💥 Exploit

FreeBSD 4.1.1 and earlier, and possibly other BSD-based OSes, uses an insufficient random number generator to generate initial TCP sequence numbers (ISN), which allows remote attackers to spoof TCP connections.

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).

💥 Public exploits

Exploit code or detection templates are publicly available. This is not the same as confirmed active exploitation (KEV), but it raises the risk: patch with priority.

Affected technologies (1)

Freebsd — Freebsd

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2000-0916",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 7.5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 6.4,
        "baseSeverity": "HIGH",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": true,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ]
  },
  "affected": [
    {
      "source": "cve@mitre.org",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ]
    }
  ],
  "published": "2000-12-19T05:00:00.000",
  "references": [
    {
      "url": "ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-00:52.tcp-iss.asc",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "http://www.securityfocus.com/bid/1766",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-00:52.tcp-iss.asc",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.securityfocus.com/bid/1766",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-Other"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "FreeBSD 4.1.1 and earlier, and possibly other BSD-based OSes, uses an insufficient random number generator to generate initial TCP sequence numbers (ISN), which allows remote attackers to spoof TCP connections."
    },
    {
      "lang": "es",
      "value": "FreeBSD 4.1.1 y anteriores, y posiblemente otros sistemas operativos basados en BSD, utiliza un generador de números aleatorios insuficiente para generar números de secuencia TCP iniciales (ISN), lo que permite a atacantes remotos suplantar conexiones TCP."
    }
  ],
  "lastModified": "2026-09-23T10:10:00.673",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:freebsd:freebsd:2.0:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "F1F098C1-D09E-49B4-9B51-E84B6C4EA6CD"
            },
            {
              "criteria": "cpe:2.3:o:freebsd:freebsd:3.0:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "EE38C50A-81FE-412E-9717-3672FAE6A6F4"
            },
            {
              "criteria": "cpe:2.3:o:freebsd:freebsd:4.0:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "D0A585A1-FF82-418F-90F8-072458DB7816"
            },
            {
              "criteria": "cpe:2.3:o:freebsd:freebsd:4.1:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "AE31DFF8-06AB-489D-A0C5-509C090283B5"
            },
            {
              "criteria": "cpe:2.3:o:freebsd:freebsd:4.1.1:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "3BE1E3D8-2BB1-4FFA-9BC9-7AF347D26190"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "cve@mitre.org"
}