{
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      "text": "High"
    },
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "distribution": {
      "text": "TuxCare License Agreement",
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        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.",
        "title": "Terms of Use"
      }
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      "contact_details": "https://tuxcare.com/contact/",
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        "category": "self",
        "summary": "Canonical URL",
        "url": "https://security.tuxcare.com/csaf/v2/els_os/oraclelinux6els/vex/2025/cve-2025-5994-els_os-oraclelinux6els.json"
      }
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      "id": "CVE-2025-5994-ELS_OS-ORACLELINUX6ELS",
      "initial_release_date": "2025-07-16T15:15:00Z",
      "revision_history": [
        {
          "date": "2025-07-16T15:15:00Z",
          "number": "1",
          "summary": "Initial version"
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        {
          "date": "2026-10-28T11:32:52Z",
          "number": "2",
          "summary": "Official Publication"
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      "status": "final",
      "version": "2"
    },
    "title": "Security update on CVE-2025-5994"
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  "vulnerabilities": [
    {
      "cve": "CVE-2025-5994",
      "cwe": {
        "id": "CWE-349",
        "name": "Acceptance of Extraneous Untrusted Data With Trusted Data"
      },
      "notes": [
        {
          "category": "description",
          "text": "A multi-vendor cache poisoning vulnerability named 'Rebirthday Attack' has been discovered in caching resolvers that support EDNS Client Subnet (ECS). Unbound is also vulnerable when compiled with ECS support, i.e., '--enable-subnet', AND configured to send ECS information along with queries to upstream name servers, i.e., at least one of the 'send-client-subnet', 'client-subnet-zone' or 'client-subnet-always-forward' options is used. Resolvers supporting ECS need to segregate outgoing queries to accommodate for different outgoing ECS information. This re-opens up resolvers to a birthday paradox attack (Rebirthday Attack) that tries to match the DNS transaction ID in order to cache non-ECS poisonous replies.",
          "title": "Vulnerability description"
        },
        {
          "category": "other",
          "text": "TuxCare has assessed that this vulnerability does not impact any currently supported TuxCare products. This evaluation may change as new information becomes available. For additional details regarding this vulnerability and affected products, refer to the provided references.",
          "title": "Statement"
        }
      ],
      "product_status": {
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          "Oracle-Linux-6:unbound-python-0:1.4.20-29.el6_10.1.tuxcare.els2.i686",
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          "url": "https://cve.tuxcare.com/els/cve/CVE-2025-5994"
        },
        {
          "category": "external",
          "summary": "https://nlnetlabs.nl/downloads/unbound/CVE-2025-5994.txt",
          "url": "https://nlnetlabs.nl/downloads/unbound/CVE-2025-5994.txt"
        },
        {
          "category": "external",
          "summary": "https://lists.debian.org/debian-lts-announce/2025/08/msg00019.html",
          "url": "https://lists.debian.org/debian-lts-announce/2025/08/msg00019.html"
        }
      ],
      "release_date": "2025-07-16T15:15:00Z",
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        },
        {
          "category": "impact",
          "date": "2026-10-16T08:51:12.942885Z",
          "details": "important",
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}