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CVE-2019-6469

Status: ModifiedHigh (7.5)—

An error in the EDNS Client Subnet (ECS) feature for recursive resolvers can cause BIND to exit with an assertion failure when processing a response that has malformed RRSIGs. Versions affected: BIND 9.10.5-S1 -> 9.11.6-S1 of BIND 9 Supported Preview Edition.

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)

ISC — Bind

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2019-6469",
  "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": "Secondary",
        "source": "security-officer@isc.org",
        "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
      }
    ],
    "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:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "security-officer@isc.org",
      "affectedData": [
        {
          "vendor": "ISC",
          "product": "BIND 9 Supported Preview Edition",
          "versions": [
            {
              "status": "affected",
              "version": "BIND 9.10.5-S1 -> 9.11.6-S1 of BIND 9 Supported Preview Edition."
            }
          ]
        }
      ]
    }
  ],
  "published": "2019-10-09T16:15:17.077",
  "references": [
    {
      "url": "https://kb.isc.org/docs/cve-2019-6469",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "security-officer@isc.org"
    },
    {
      "url": "https://support.f5.com/csp/article/K39751401?utm_source=f5support&amp%3Butm_medium=RSS",
      "source": "security-officer@isc.org"
    },
    {
      "url": "https://kb.isc.org/docs/cve-2019-6469",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://support.f5.com/csp/article/K39751401?utm_source=f5support&amp%3Butm_medium=RSS",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-617"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "An error in the EDNS Client Subnet (ECS) feature for recursive resolvers can cause BIND to exit with an assertion failure when processing a response that has malformed RRSIGs. Versions affected: BIND 9.10.5-S1 -> 9.11.6-S1 of BIND 9 Supported Preview Edition."
    },
    {
      "lang": "es",
      "value": "Un error en la funcionalidad EDNS Client Subnet (ECS) para los solucionadores recursivos puede hacer que BIND salga con un fallo de aserción cuando se procesa una respuesta que tiene RRSIG malformados. Versiones afectadas: BIND 9.10.5-S1 hasta 9.11.6-S1 de BIND 9 Supported Preview Edition."
    }
  ],
  "lastModified": "2026-06-17T02:39:05.923",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:isc:bind:9.10.5:s1:*:*:supported_preview:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "CAD41122-C5D8-4256-8CB7-FF88DCD96A13"
            },
            {
              "criteria": "cpe:2.3:a:isc:bind:9.11.6:s1:*:*:supported_preview:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "8AF9D390-0D5B-4963-A2D3-BF1E7CD95E9D"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "security-officer@isc.org"
}