cve-2023-4236
Vulnerability from cvelistv5
Published
2023-09-20 12:32
Modified
2024-08-02 07:24
Summary
named may terminate unexpectedly under high DNS-over-TLS query load
Impacted products
ISCBIND 9
Show details on NVD website


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          "dateUpdated": "2024-08-02T07:24:03.623Z",
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            "name": "CVE-2023-4236",
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            "url": "https://kb.isc.org/docs/cve-2023-4236"
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            "url": "http://www.openwall.com/lists/oss-security/2023/09/20/2"
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            "url": "https://www.debian.org/security/2023/dsa-5504"
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        "title": "CVE Program Container"
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    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "BIND 9",
          "vendor": "ISC",
          "versions": [
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              "lessThanOrEqual": "9.18.18",
              "status": "affected",
              "version": "9.18.0",
              "versionType": "custom"
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              "status": "affected",
              "version": "9.18.11-S1",
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      ],
      "credits": [
        {
          "lang": "en",
          "value": "ISC would like to thank Robert Story from the USC/ISI DNS root server operations team for bringing this vulnerability to our attention."
        }
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      "datePublic": "2023-09-20T00:00:00Z",
      "descriptions": [
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          "value": "A flaw in the networking code handling DNS-over-TLS queries may cause `named` to terminate unexpectedly due to an assertion failure. This happens when internal data structures are incorrectly reused under significant DNS-over-TLS query load.\nThis issue affects BIND 9 versions 9.18.0 through 9.18.18 and 9.18.11-S1 through 9.18.18-S1."
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      "exploits": [
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          "value": "We are not aware of any active exploits."
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      "impacts": [
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              "lang": "en",
              "value": "A `named` instance vulnerable to this flaw may terminate unexpectedly when subjected to significant DNS-over-TLS query load.\n\nThis flaw does not affect DNS-over-HTTPS code, as that uses a different TLS implementation."
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            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
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      "solutions": [
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      "title": "named may terminate unexpectedly under high DNS-over-TLS query load",
      "workarounds": [
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          "lang": "en",
          "value": "Disabling listening for DNS-over-TLS connections (by removing `listen-on ... tls ... { ... };` statements from the configuration) prevents the affected code paths from being taken, rendering exploitation impossible. However, there is no workaround for this flaw if DNS-over-TLS support is required."
        }
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    "assignerShortName": "isc",
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    "datePublished": "2023-09-20T12:32:16.631Z",
    "dateReserved": "2023-08-08T10:23:50.680Z",
    "dateUpdated": "2024-08-02T07:24:03.623Z",
    "state": "PUBLISHED"
  },
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  }
}


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