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Medium

Security advisory

Type: advisorySources: OSVCVE: CVE-2022-30699

NLnet Labs Unbound, up to and including version 1.16.1, is vulnerable to a novel type of the "ghost domain names" attack. The vulnerability works by targeting an Unbound instance. Unbound is queried for a rogue domain name when the cached delegation information is about to expire. The rogue nameserver delays the response so that the cached delegation information is expired. Upon receiving the delayed answer containing the delegation information, Unbound overwrites the now expired entries. This action can be repeated when the delegation information is about to expire making the rogue delegation information ever-updating. From version 1.16.2 on, Unbound stores the start time for a query and uses that to decide if the cached delegation information can be overwritten.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2022-30699
Confirmed fixed CVEs
Not specified
Updated in this feed
1 Nov 2026, 07:41 UTC · Revision 1

Source evidence

CVE-2022-30699

core-osv · Original source

Published 1 Aug 2022, 15:15 UTC

NLnet Labs Unbound, up to and including version 1.16.1, is vulnerable to a novel type of the "ghost domain names" attack. The vulnerability works by targeting an Unbound instance. Unbound is queried for a rogue domain name when the cached delegation information is about to expire. The rogue nameserver delays the response so that the cached delegation information is expired. Upon receiving the delayed answer containing the delegation information, Unbound overwrites the now expired entries. This action can be repeated when the delegation information is about to expire making the rogue delegation information ever-updating. From version 1.16.2 on, Unbound stores the start time for a query and uses that to decide if the cached delegation information can be overwritten.

osv:CVE-2022-30699
Complete source record
{
  "id": "b76c82832a0b9b9aab93fd6c566cd5f526a51eaede16e7ff05b1c2521a069e9e",
  "url": "https://osv.dev/vulnerability/CVE-2022-30699",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2022-30699",
    "summary": "NLnet Labs Unbound, up to and including version 1.16.1, is vulnerable to a novel type of the \"ghost domain names\" attack. The vulnerability works by targeting an Unbound instance. Unbound is queried for a rogue domain name when the cached delegation information is about to expire. The rogue nameserver delays the response so that the cached delegation information is expired. Upon receiving the delayed answer containing the delegation information, Unbound overwrites the now expired entries. This action can be repeated when the delegation information is about to expire making the rogue delegation information ever-updating. From version 1.16.2 on, Unbound stores the start time for a query and uses that to decide if the cached delegation information can be overwritten.",
    "evidence": "osv:CVE-2022-30699",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2022-30699",
      "aliases": [
        "CVE-2022-30699"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/nlnetlabs/unbound",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
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                {
                  "fixed": "cbed768b8ff9bfcf11089a5f1699b7e5707f1ea5"
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              "database_specific": {
                "extracted_events": [
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                    "cpe": "cpe:2.3:a:nlnetlabs:unbound:*:*:*:*:*:*:*:*",
                    "range": [
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                        "introduced": "0"
                      },
                      {
                        "fixed": "1.16.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-30699.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:56.828957190Z",
      "provider": "osv",
      "references": [
        "https://lists.debian.org/debian-lts-announce/2023/03/msg00024.html",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5L3ZFWZZFPBIL654BG75RWXUMPFQJ5EC/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/D35CX4SCZVNKZTWJXPDFTHWZHINMGEZD/",
        "https://security.gentoo.org/glsa/202212-02",
        "https://www.nlnetlabs.nl/downloads/unbound/CVE-2022-30698_CVE-2022-30699.txt"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
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              "cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:*"
            ],
            "vendor_product": "fedoraproject:fedora",
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                  },
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                  }
                ],
                "source": "CPE_STRING"
              }
            ]
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        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2022-30699",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 438734,
  "published_at": "2022-08-01T15:15:09.89+00:00"
}