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CVE-2021-25218

Status: ModifiedHigh (7.5)—

In BIND 9.16.19, 9.17.16. Also, version 9.16.19-S1 of BIND Supported Preview Edition When a vulnerable version of named receives a query under the circumstances described above, the named process will terminate due to a failed assertion check. The vulnerability affects only BIND 9 releases 9.16.19, 9.17.16, and release 9.16.19-S1 of the BIND 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 (2)

Fedoraproject — FedoraISC — Bind

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2021-25218",
  "cveTags": [],
  "metrics": {
    "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:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-officer@isc.org",
        "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
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        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
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          "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
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  },
  "affected": [
    {
      "source": "security-officer@isc.org",
      "affectedData": [
        {
          "vendor": "ISC",
          "product": "BIND9",
          "versions": [
            {
              "status": "affected",
              "version": "Stable Branch 9.16.19"
            },
            {
              "status": "affected",
              "version": "Development Branch 9.17.16"
            },
            {
              "status": "affected",
              "version": "Supported Preview Edition 9.16.19-S1"
            }
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  ],
  "published": "2021-08-18T19:15:07.333",
  "references": [
    {
      "url": "http://www.openwall.com/lists/oss-security/2021/08/18/3",
      "tags": [
        "Mailing List",
        "Patch",
        "Third Party Advisory"
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      "source": "security-officer@isc.org"
    },
    {
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      "tags": [
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      "tags": [
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      "source": "security-officer@isc.org"
    },
    {
      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZPJCLGSR4BTGFLBLGIE5TEQP2SNJKGVL/",
      "source": "security-officer@isc.org"
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    {
      "url": "https://security.netapp.com/advisory/ntap-20210909-0002/",
      "tags": [
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      "source": "security-officer@isc.org"
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2021/08/18/3",
      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2021/08/20/2",
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    },
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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      "url": "https://security.netapp.com/advisory/ntap-20210909-0002/",
      "tags": [
        "Third Party Advisory"
      ],
      "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": "In BIND 9.16.19, 9.17.16. Also, version 9.16.19-S1 of BIND Supported Preview Edition When a vulnerable version of named receives a query under the circumstances described above, the named process will terminate due to a failed assertion check. The vulnerability affects only BIND 9 releases 9.16.19, 9.17.16, and release 9.16.19-S1 of the BIND Supported Preview Edition."
    },
    {
      "lang": "es",
      "value": "En BIND versiones 9.16.19, 9.17.16. Además, la versión 9.16.19-S1 de BIND Supported Preview Edition. Cuando una versión vulnerable de named recibe una consulta en las circunstancias descritas anteriormente, el proceso named terminará debido a una comprobación de aserción fallida. La vulnerabilidad sólo afecta a versiones 9.16.19, 9.17.16 y 9.16.19-S1 de BIND Supported Preview Edition."
    }
  ],
  "lastModified": "2026-06-17T03:41:39.827",
  "configurations": [
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}