{
  "cveId": "CVE-2025-5994",
  "url": "https://patchblox.com/security/cve/CVE-2025-5994",
  "summary": "CVE-2025-5994 is fixed in 15 products on 1 platform, first by RHSA-2025:12064, released July 16, 2025. It is not reported as exploited. Patch Radar priority: High.",
  "title": "Cache poisoning via the ECS-enabled Rebirthday Attack",
  "description": "A multi-vendor cache poisoning vulnerability named \u0027Rebirthday Attack\u0027 hasbeen discovered in caching resolvers that support EDNS Client Subnet (ECS).Unbound is also vulnerable when compiled with ECS support, i.e.,\u0027--enable-subnet\u0027, AND configured to send ECS information along withqueries to upstream name servers, i.e., at least one of the\u0027send-client-subnet\u0027, \u0027client-subnet-zone\u0027 or\u0027client-subnet-always-forward\u0027 options is used. Resolvers supporting ECSneed to segregate outgoing queries to accommodate for different outgoingECS information. This re-opens up resolvers to a birthday paradox attack(Rebirthday Attack) that tries to match the DNS transaction ID in order tocache non-ECS poisonous replies.",
  "published": "2025-07-16T14:38:22Z",
  "severity": "Medium",
  "cvss": 7.5,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
  "cwe": "Acceptance of Extraneous Untrusted Data With Trusted Data",
  "epss": 0.00218,
  "epssPercentile": 0.12407,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-5994",
  "fixes": [
    {
      "platform": "linux",
      "product": "libunbound8",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1.13.1-1ubuntu5.11",
      "fix": "libunbound8 1.13.1-1ubuntu5.11",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-libunbound8-1.13.1-1ubuntu5.11",
      "released": "2025-07-16T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libunbound8",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "1.19.2-1ubuntu3.5",
      "fix": "libunbound8 1.19.2-1ubuntu3.5",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-libunbound8-1.19.2-1ubuntu3.5",
      "released": "2025-07-16T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libunbound8",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "1.22.0-1ubuntu1.1",
      "fix": "libunbound8 1.22.0-1ubuntu1.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-libunbound8-1.22.0-1ubuntu1.1",
      "released": "2025-07-17T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libunbound8",
      "release": "Ubuntu 25.10 (questing)",
      "fixedVersion": "1.22.0-2ubuntu1",
      "fix": "libunbound8 1.22.0-2ubuntu1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-questing-libunbound8-1.22.0-2ubuntu1",
      "released": "2025-07-16T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-unbound",
      "release": "RHEL 8",
      "fixedVersion": "0:1.16.2-5.9.el8_10",
      "fix": "RHSA-2025:11884",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2025-11884",
      "released": "2025-07-28T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-unbound",
      "release": "RHEL 9",
      "fixedVersion": "0:1.16.2-19.el9_6.1",
      "fix": "RHSA-2025:11849",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2025-11849",
      "released": "2025-07-28T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-unbound",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1.13.1-1ubuntu5.11",
      "fix": "python3-unbound 1.13.1-1ubuntu5.11",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-python3-unbound-1.13.1-1ubuntu5.11",
      "released": "2025-07-16T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-unbound",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "1.19.2-1ubuntu3.5",
      "fix": "python3-unbound 1.19.2-1ubuntu3.5",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-python3-unbound-1.19.2-1ubuntu3.5",
      "released": "2025-07-16T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-unbound",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "1.22.0-1ubuntu1.1",
      "fix": "python3-unbound 1.22.0-1ubuntu1.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-python3-unbound-1.22.0-1ubuntu1.1",
      "released": "2025-07-17T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-unbound",
      "release": "Ubuntu 25.10 (questing)",
      "fixedVersion": "1.22.0-2ubuntu1",
      "fix": "python3-unbound 1.22.0-2ubuntu1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-questing-python3-unbound-1.22.0-2ubuntu1",
      "released": "2025-07-16T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-unbound",
      "release": "almalinux 10",
      "fixedVersion": "1.20.0-12.el10_0",
      "fix": "ALSA-2025:12064",
      "url": "https://patchblox.com/security/fix/linux/alsa-2025-12064",
      "released": "2025-07-29T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-unbound",
      "release": "almalinux 8",
      "fixedVersion": "1.16.2-5.9.el8_10",
      "fix": "ALSA-2025:11884",
      "url": "https://patchblox.com/security/fix/linux/alsa-2025-11884",
      "released": "2025-07-28T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-unbound",
      "release": "almalinux 9",
      "fixedVersion": "1.16.2-19.el9_6.1",
      "fix": "ALSA-2025:11849",
      "url": "https://patchblox.com/security/fix/linux/alsa-2025-11849",
      "released": "2025-07-28T00:00:00Z"
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    {
      "platform": "linux",
      "product": "python3-unbound",
      "release": "amzn 2023",
      "fixedVersion": "1.17.1-1.amzn2023.0.8",
      "fix": "ALAS2023-2025-1122",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2025-1122",
      "released": "2025-07-29T23:15:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-unbound",
      "release": "ol 10",
      "fixedVersion": "0:1.20.0-12.el10_0",
      "fix": "ELSA-2025-12064",
      "url": "https://patchblox.com/security/fix/linux/elsa-2025-12064",
      "released": "2025-07-29T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-unbound",
      "release": "ol 8",
      "fixedVersion": "0:1.16.2-5.9.el8_10",
      "fix": "ELSA-2025-11884",
      "url": "https://patchblox.com/security/fix/linux/elsa-2025-11884",
      "released": "2025-07-28T00:00:00Z"
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    {
      "platform": "linux",
      "product": "python3-unbound",
      "release": "ol 9",
      "fixedVersion": "0:1.16.2-19.el9_6.1",
      "fix": "ELSA-2025-11849",
      "url": "https://patchblox.com/security/fix/linux/elsa-2025-11849",
      "released": "2025-07-28T00:00:00Z"
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    {
      "platform": "linux",
      "product": "python3-unbound-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1.17.1-1.amzn2023.0.8",
      "fix": "ALAS2023-2025-1122",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2025-1122",
      "released": "2025-07-29T23:15:00Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "1.17.1-2\u002Bdeb12u3",
      "fix": "DEBIAN-CVE-2025-5994",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-5994",
      "released": "2025-07-16T15:15:33Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "1.22.0-2",
      "fix": "DEBIAN-CVE-2025-5994",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-5994",
      "released": "2025-07-16T15:15:33Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "Debian 14",
      "fixedVersion": "1.22.0-2",
      "fix": "DEBIAN-CVE-2025-5994",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-5994",
      "released": "2025-07-16T15:15:33Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "RHEL 10",
      "fixedVersion": "1.20.0-12.el10_0",
      "fix": "RHSA-2025:12064",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2025-12064",
      "released": "2025-07-16T14:38:22Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "RHEL 8",
      "fixedVersion": "0:1.16.2-5.9.el8_10",
      "fix": "RHSA-2025:11884",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2025-11884",
      "released": "2025-07-28T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "unbound",
      "release": "RHEL 9",
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      "fix": "RHSA-2025:11849",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2025-11849",
      "released": "2025-07-28T00:00:00Z"
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    {
      "platform": "linux",
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      "release": "Ubuntu 22.04.1 LTS (jammy)",
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      "fix": "unbound 1.13.1-1ubuntu5.11",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-unbound-1.13.1-1ubuntu5.11",
      "released": "2025-07-16T17:00:00Z"
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      "release": "Ubuntu 24.04.5 LTS (noble)",
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-unbound-1.19.2-1ubuntu3.5",
      "released": "2025-07-16T17:00:00Z"
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      "product": "unbound",
      "release": "Ubuntu 25.04 (plucky)",
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      "fix": "unbound 1.22.0-1ubuntu1.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-unbound-1.22.0-1ubuntu1.1",
      "released": "2025-07-17T00:00:00Z"
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      "platform": "linux",
      "product": "unbound",
      "release": "Ubuntu 25.10 (questing)",
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      "fix": "unbound 1.22.0-2ubuntu1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-questing-unbound-1.22.0-2ubuntu1",
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      "product": "unbound",
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      "platform": "linux",
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      "fixedVersion": "0:1.16.2-5.9.el8_10",
      "fix": "ELSA-2025-11884",
      "url": "https://patchblox.com/security/fix/linux/elsa-2025-11884",
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      "platform": "linux",
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      "fix": "ELSA-2025-11849",
      "url": "https://patchblox.com/security/fix/linux/elsa-2025-11849",
      "released": "2025-07-28T00:00:00Z"
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    {
      "platform": "linux",
      "product": "unbound",
      "release": "rocky 8",
      "fixedVersion": "0:1.16.2-5.9.el8",
      "fix": "RLSA-2025:11884",
      "url": "https://patchblox.com/security/fix/linux/rlsa-2025-11884",
      "released": "2026-05-29T18:01:02Z"
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    {
      "platform": "linux",
      "product": "unbound",
      "release": "rocky 9",
      "fixedVersion": "0:1.16.2-19.el9_6.1",
      "fix": "RLSA-2025:11849",
      "url": "https://patchblox.com/security/fix/linux/rlsa-2025-11849",
      "released": "2025-10-04T00:11:30Z"
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    {
      "platform": "linux",
      "product": "unbound-anchor",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
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      "fix": "unbound-anchor 1.13.1-1ubuntu5.11",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-unbound-anchor-1.13.1-1ubuntu5.11",
      "released": "2025-07-16T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "unbound-anchor",
      "release": "Ubuntu 24.04.5 LTS (noble)",
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      "fix": "unbound-anchor 1.19.2-1ubuntu3.5",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-unbound-anchor-1.19.2-1ubuntu3.5",
      "released": "2025-07-16T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "unbound-anchor",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "1.22.0-1ubuntu1.1",
      "fix": "unbound-anchor 1.22.0-1ubuntu1.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-unbound-anchor-1.22.0-1ubuntu1.1",
      "released": "2025-07-17T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "unbound-anchor",
      "release": "Ubuntu 25.10 (questing)",
      "fixedVersion": "1.22.0-2ubuntu1",
      "fix": "unbound-anchor 1.22.0-2ubuntu1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-questing-unbound-anchor-1.22.0-2ubuntu1",
      "released": "2025-07-16T17:00:00Z"
    },
    {
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      "product": "unbound-anchor",
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      "url": "https://patchblox.com/security/fix/linux/alas2023-2025-1122",
      "released": "2025-07-29T23:15:00Z"
    },
    {
      "platform": "linux",
      "product": "unbound-anchor",
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      "fixedVersion": "0:1.20.0-12.el10_0",
      "fix": "ELSA-2025-12064",
      "url": "https://patchblox.com/security/fix/linux/elsa-2025-12064",
      "released": "2025-07-29T00:00:00Z"
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    {
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      "url": "https://patchblox.com/security/fix/linux/alas2023-2025-1122",
      "released": "2025-07-29T23:15:00Z"
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      "fix": "ALAS2023-2025-1122",
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      "released": "2025-07-29T23:15:00Z"
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      "released": "2025-07-29T23:15:00Z"
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      "fix": "RHSA-2025:11849",
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      "platform": "linux",
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      "fixedVersion": "1.16.2-5.9.el8_10",
      "fix": "ALSA-2025:11884",
      "url": "https://patchblox.com/security/fix/linux/alsa-2025-11884",
      "released": "2025-07-28T00:00:00Z"
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    {
      "platform": "linux",
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      "release": "almalinux 9",
      "fixedVersion": "1.16.2-19.el9_6.1",
      "fix": "ALSA-2025:11849",
      "url": "https://patchblox.com/security/fix/linux/alsa-2025-11849",
      "released": "2025-07-28T00:00:00Z"
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      "release": "amzn 2023",
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      "url": "https://patchblox.com/security/fix/linux/alas2023-2025-1122",
      "released": "2025-07-29T23:15:00Z"
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      "fix": "ELSA-2025-12064",
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      "fix": "ELSA-2025-11884",
      "url": "https://patchblox.com/security/fix/linux/elsa-2025-11884",
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    {
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