{
  "cveId": "CVE-2025-40777",
  "url": "https://patchblox.com/security/cve/CVE-2025-40777",
  "summary": "CVE-2025-40777 is fixed in 20 products on 1 platform, first by bind9 1:9.20.4-3ubuntu1.2, released July 16, 2025. It is not reported as exploited. Patch Radar priority: High.",
  "title": "A possible assertion failure when \u0027stale-answer-client-timeout\u0027 is set to \u00270\u0027",
  "description": "If a \u0060named\u0060 caching resolver is configured with \u0060serve-stale-enable\u0060\u0060yes\u0060, and with \u0060stale-answer-client-timeout\u0060 set to \u00600\u0060 (the onlyallowable value other than \u0060disabled\u0060), and if the resolver, in the processof resolving a query, encounters a CNAME chain involving a specificcombination of cached or authoritative records, the daemon will abort withan assertion failure.This issue affects BIND 9 versions 9.20.0 through 9.20.10, 9.21.0 through9.21.9, and 9.20.9-S1 through 9.20.10-S1.",
  "published": "2025-07-16T00:00:00Z",
  "severity": "Moderate",
  "cvss": 7.5,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "cwe": "Reachable Assertion",
  "epss": 0.01016,
  "epssPercentile": 0.63531,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-40777",
  "fixes": [
    {
      "platform": "linux",
      "product": "bind",
      "release": "amzn 2023",
      "fixedVersion": "32:9.18.33-1.amzn2023.0.3",
      "fix": "ALAS2023-2025-1105",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2025-1105",
      "released": "2025-07-21T23:13:00Z"
    },
    {
      "platform": "linux",
      "product": "bind",
      "release": "sles 15.7",
      "fixedVersion": "9.20.11-150700.3.6.1",
      "fix": "SUSE-SU-2025:02349-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2025-02349-1",
      "released": "2025-07-17T11:47:22Z"
    },
    {
      "platform": "linux",
      "product": "bind-chroot",
      "release": "amzn 2023",
      "fixedVersion": "32:9.18.33-1.amzn2023.0.3",
      "fix": "ALAS2023-2025-1105",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2025-1105",
      "released": "2025-07-21T23:13:00Z"
    },
    {
      "platform": "linux",
      "product": "bind-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "32:9.18.33-1.amzn2023.0.3",
      "fix": "ALAS2023-2025-1105",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2025-1105",
      "released": "2025-07-21T23:13:00Z"
    },
    {
      "platform": "linux",
      "product": "bind-debugsource",
      "release": "amzn 2023",
      "fixedVersion": "32:9.18.33-1.amzn2023.0.3",
      "fix": "ALAS2023-2025-1105",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2025-1105",
      "released": "2025-07-21T23:13:00Z"
    },
    {
      "platform": "linux",
      "product": "bind-devel",
      "release": "amzn 2023",
      "fixedVersion": "32:9.18.33-1.amzn2023.0.3",
      "fix": "ALAS2023-2025-1105",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2025-1105",
      "released": "2025-07-21T23:13:00Z"
    },
    {
      "platform": "linux",
      "product": "bind-dnssec-utils",
      "release": "amzn 2023",
      "fixedVersion": "32:9.18.33-1.amzn2023.0.3",
      "fix": "ALAS2023-2025-1105",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2025-1105",
      "released": "2025-07-21T23:13:00Z"
    },
    {
      "platform": "linux",
      "product": "bind-dnssec-utils-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "32:9.18.33-1.amzn2023.0.3",
      "fix": "ALAS2023-2025-1105",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2025-1105",
      "released": "2025-07-21T23:13:00Z"
    },
    {
      "platform": "linux",
      "product": "bind-doc",
      "release": "amzn 2023",
      "fixedVersion": "32:9.18.33-1.amzn2023.0.3",
      "fix": "ALAS2023-2025-1105",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2025-1105",
      "released": "2025-07-21T23:13:00Z"
    },
    {
      "platform": "linux",
      "product": "bind-libs",
      "release": "amzn 2023",
      "fixedVersion": "32:9.18.33-1.amzn2023.0.3",
      "fix": "ALAS2023-2025-1105",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2025-1105",
      "released": "2025-07-21T23:13:00Z"
    },
    {
      "platform": "linux",
      "product": "bind-libs-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "32:9.18.33-1.amzn2023.0.3",
      "fix": "ALAS2023-2025-1105",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2025-1105",
      "released": "2025-07-21T23:13:00Z"
    },
    {
      "platform": "linux",
      "product": "bind-license",
      "release": "amzn 2023",
      "fixedVersion": "32:9.18.33-1.amzn2023.0.3",
      "fix": "ALAS2023-2025-1105",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2025-1105",
      "released": "2025-07-21T23:13:00Z"
    },
    {
      "platform": "linux",
      "product": "bind-utils",
      "release": "amzn 2023",
      "fixedVersion": "32:9.18.33-1.amzn2023.0.3",
      "fix": "ALAS2023-2025-1105",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2025-1105",
      "released": "2025-07-21T23:13:00Z"
    },
    {
      "platform": "linux",
      "product": "bind-utils-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "32:9.18.33-1.amzn2023.0.3",
      "fix": "ALAS2023-2025-1105",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2025-1105",
      "released": "2025-07-21T23:13:00Z"
    },
    {
      "platform": "linux",
      "product": "bind9",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "1:9.20.11-1",
      "fix": "DEBIAN-CVE-2025-40777",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-40777",
      "released": "2025-07-16T18:15:24Z"
    },
    {
      "platform": "linux",
      "product": "bind9",
      "release": "Debian 14",
      "fixedVersion": "1:9.20.11-1",
      "fix": "DEBIAN-CVE-2025-40777",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-40777",
      "released": "2025-07-16T18:15:24Z"
    },
    {
      "platform": "linux",
      "product": "bind9",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "1:9.20.4-3ubuntu1.2",
      "fix": "bind9 1:9.20.4-3ubuntu1.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-bind9-1-9.20.4-3ubuntu1.2",
      "released": "2025-07-16T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "bind9-dnsutils",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "1:9.20.4-3ubuntu1.2",
      "fix": "bind9-dnsutils 1:9.20.4-3ubuntu1.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-bind9-dnsutils-1-9.20.4-3ubuntu1.2",
      "released": "2025-07-16T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "bind9-host",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "1:9.20.4-3ubuntu1.2",
      "fix": "bind9-host 1:9.20.4-3ubuntu1.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-bind9-host-1-9.20.4-3ubuntu1.2",
      "released": "2025-07-16T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "bind9-libs",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "1:9.20.4-3ubuntu1.2",
      "fix": "bind9-libs 1:9.20.4-3ubuntu1.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-bind9-libs-1-9.20.4-3ubuntu1.2",
      "released": "2025-07-16T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "bind9-utils",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "1:9.20.4-3ubuntu1.2",
      "fix": "bind9-utils 1:9.20.4-3ubuntu1.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-bind9-utils-1-9.20.4-3ubuntu1.2",
      "released": "2025-07-16T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "bind9utils",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "1:9.20.4-3ubuntu1.2",
      "fix": "bind9utils 1:9.20.4-3ubuntu1.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-bind9utils-1-9.20.4-3ubuntu1.2",
      "released": "2025-07-16T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dnsutils",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "1:9.20.4-3ubuntu1.2",
      "fix": "dnsutils 1:9.20.4-3ubuntu1.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-dnsutils-1-9.20.4-3ubuntu1.2",
      "released": "2025-07-16T00:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T07:25:28Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}