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Linux Distros Unpatched Vulnerability : CVE-2025-59529

🗓️ 19 Dec 2025 00:00:00Reported by TenableType 
nessus
 nessus
🔗 www.tenable.com👁 2 Views

Unpatched Avahi vulnerability CVE-2025-59529 allows unlimited connections, causing denial of service.

Related
Refs
Code
ReporterTitlePublishedViews
Family
AlpineLinux
CVE-2025-59529
18 Dec 202520:25
alpinelinux
Chainguard
CVE-2025-59529 vulnerabilities
12 Feb 202601:17
cgr
Circl
CVE-2025-59529
19 Dec 202518:57
circl
CNNVD
Avahi 资源管理错误漏洞
18 Dec 202500:00
cnnvd
CVE
CVE-2025-59529
18 Dec 202520:25
cve
Cvelist
CVE-2025-59529 simple protocol server ignores accepts unlimited connections and logs failures without limit
18 Dec 202520:25
cvelist
Debian CVE
CVE-2025-59529
18 Dec 202520:25
debiancve
EUVD
EUVD-2025-204402
18 Dec 202520:25
euvd
NVD
CVE-2025-59529
18 Dec 202521:15
nvd
OSV
AZL-72851 CVE-2025-59529 affecting package avahi 0.8-5
18 Dec 202521:15
osv
Rows per page
#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(279387);
  script_version("1.8");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/22");

  script_cve_id("CVE-2025-59529");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2025-59529");

  script_set_attribute(attribute:"synopsis", value:
"The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be
patched.");
  script_set_attribute(attribute:"description", value:
"The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied
patch available.

  - Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol
    suite. In versions up to and including 0.9-rc2, the simple protocol server ignores the documented client
    limit and accepts unlimited connections, allowing for easy local DoS. Although `CLIENTS_MAX` is defined,
    `server_work()` unconditionally `accept()`s and `client_new()` always appends the new client and
    increments `n_clients`. There is no check against the limit. When client cannot be accepted as a result of
    maximal socket number of avahi-daemon, it logs unconditionally error per each connection. Unprivileged
    local users can exhaust daemon memory and file descriptors, causing a denial of service system-wide for
    mDNS/DNS-SD. Exhausting local file descriptors causes increased system load caused by logging errors of
    each of request. Overloading prevents glibc calls using nss-mdns plugins to resolve `*.local.` names and
    link-local addresses. As of time of publication, no known patched versions are available, but a candidate
    fix is available in pull request 808, and some workarounds are available. Simple clients are offered for
    nss-mdns package functionality. It is not possible to disable the unix socket `/run/avahi-daemon/socket`,
    but resolution requests received via DBus are not affected directly. Tools avahi-resolve, avahi-resolve-
    address and avahi-resolve-host-name are not affected, they use DBus interface. It is possible to change
    permissions of unix socket after avahi-daemon is started. But avahi-daemon does not provide any
    configuration for it. Additional access restrictions like SELinux can also prevent unwanted tools to
    access the socket and keep resolution working for trusted users. (CVE-2025-59529)

Note that Nessus relies on the presence of the package as reported by the vendor.");
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  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2025-59529");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2025-59529");
  script_set_attribute(attribute:"solution", value:
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  script_set_attribute(attribute:"agent", value:"unix");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:N/I:N/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:U/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:U/RC:C");
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  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
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  script_set_attribute(attribute:"vuln_publication_date", value:"2025/12/18");
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  script_category(ACT_GATHER_INFO);
  script_family(english:"Misc.");

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  script_dependencies("ssh_get_info2.nasl", "set_linux_os_id.nasl");
  script_require_keys("Host/cpu", "Host/local_checks_enabled", "global_settings/vendor_unpatched", "Host/OS/identifier");
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  exit(0);
}

if (!get_kb_item("global_settings/vendor_unpatched")) exit(0, "Unpatched Vulnerabilities Detection not active.");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (empty_or_null(get_one_kb_item("Host/CentOS/rpm-list")) && empty_or_null(get_one_kb_item("Host/Debian/dpkg-l")) && empty_or_null(get_one_kb_item("Host/RedHat/rpm-list"))) audit(AUDIT_PACKAGE_LIST_MISSING);

include('linux_unpatched.inc');

var distro_constraints_array = {
  "Debian Linux-11": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "11",
        "pkgs": [
          {"reference": "avahi-autoipd"},
          {"reference": "avahi-daemon"},
          {"reference": "avahi-discover"},
          {"reference": "avahi-dnsconfd"},
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          {"reference": "avahi-utils"},
          {"reference": "gir1.2-avahi-0.6"},
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          {"reference": "libavahi-common-dev"},
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  "Debian Linux-12": {
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          {"reference": "libavahi-client-dev"},
          {"reference": "libavahi-client3"},
          {"reference": "libavahi-common-data"},
          {"reference": "libavahi-common-dev"},
          {"reference": "libavahi-common3"},
          {"reference": "libavahi-common3-udeb"},
          {"reference": "libavahi-compat-libdnssd-dev"},
          {"reference": "libavahi-compat-libdnssd1"},
          {"reference": "libavahi-core-dev"},
          {"reference": "libavahi-core7"},
          {"reference": "libavahi-core7-udeb"},
          {"reference": "libavahi-glib-dev"},
          {"reference": "libavahi-glib1"},
          {"reference": "libavahi-gobject-dev"},
          {"reference": "libavahi-gobject0"},
          {"reference": "libavahi-qt4-1"},
          {"reference": "libavahi-qt4-dev"},
          {"reference": "libavahi-ui-dev"},
          {"reference": "libavahi-ui-gtk3-0"},
          {"reference": "libavahi-ui-gtk3-dev"},
          {"reference": "libavahi-ui0"},
          {"reference": "python-avahi"}
        ]
      }
    ]
  },
  "Ubuntu Linux-16.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "16.04",
        "pkgs": [
          {"reference": "avahi-autoipd"},
          {"reference": "avahi-daemon"},
          {"reference": "avahi-dbg"},
          {"reference": "avahi-discover"},
          {"reference": "avahi-dnsconfd"},
          {"reference": "avahi-ui-utils"},
          {"reference": "avahi-utils"},
          {"reference": "libavahi-client-dev"},
          {"reference": "libavahi-client3"},
          {"reference": "libavahi-common-data"},
          {"reference": "libavahi-common-dev"},
          {"reference": "libavahi-common3"},
          {"reference": "libavahi-common3-udeb"},
          {"reference": "libavahi-compat-libdnssd-dev"},
          {"reference": "libavahi-compat-libdnssd1"},
          {"reference": "libavahi-core-dev"},
          {"reference": "libavahi-core7"},
          {"reference": "libavahi-core7-udeb"},
          {"reference": "libavahi-glib-dev"},
          {"reference": "libavahi-glib1"},
          {"reference": "libavahi-gobject-dev"},
          {"reference": "libavahi-gobject0"},
          {"reference": "libavahi-qt4-1"},
          {"reference": "libavahi-qt4-dev"},
          {"reference": "libavahi-ui-dev"},
          {"reference": "libavahi-ui-gtk3-0"},
          {"reference": "libavahi-ui-gtk3-dev"},
          {"reference": "libavahi-ui0"},
          {"reference": "python-avahi"}
        ]
      }
    ]
  },
  "Ubuntu Linux-18.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "18.04",
        "pkgs": [
          {"reference": "avahi-autoipd"},
          {"reference": "avahi-daemon"},
          {"reference": "avahi-discover"},
          {"reference": "avahi-dnsconfd"},
          {"reference": "avahi-ui-utils"},
          {"reference": "avahi-utils"},
          {"reference": "gir1.2-avahi-0.6"},
          {"reference": "libavahi-client-dev"},
          {"reference": "libavahi-client3"},
          {"reference": "libavahi-common-data"},
          {"reference": "libavahi-common-dev"},
          {"reference": "libavahi-common3"},
          {"reference": "libavahi-common3-udeb"},
          {"reference": "libavahi-compat-libdnssd-dev"},
          {"reference": "libavahi-compat-libdnssd1"},
          {"reference": "libavahi-core-dev"},
          {"reference": "libavahi-core7"},
          {"reference": "libavahi-core7-udeb"},
          {"reference": "libavahi-glib-dev"},
          {"reference": "libavahi-glib1"},
          {"reference": "libavahi-gobject-dev"},
          {"reference": "libavahi-gobject0"},
          {"reference": "libavahi-ui-gtk3-0"},
          {"reference": "libavahi-ui-gtk3-dev"},
          {"reference": "python-avahi"}
        ]
      }
    ]
  },
  "Ubuntu Linux-20.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "20.04",
        "pkgs": [
          {"reference": "avahi-autoipd"},
          {"reference": "avahi-daemon"},
          {"reference": "avahi-discover"},
          {"reference": "avahi-dnsconfd"},
          {"reference": "avahi-ui-utils"},
          {"reference": "avahi-utils"},
          {"reference": "gir1.2-avahi-0.6"},
          {"reference": "libavahi-client-dev"},
          {"reference": "libavahi-client3"},
          {"reference": "libavahi-common-data"},
          {"reference": "libavahi-common-dev"},
          {"reference": "libavahi-common3"},
          {"reference": "libavahi-common3-udeb"},
          {"reference": "libavahi-compat-libdnssd-dev"},
          {"reference": "libavahi-compat-libdnssd1"},
          {"reference": "libavahi-core-dev"},
          {"reference": "libavahi-core7"},
          {"reference": "libavahi-core7-udeb"},
          {"reference": "libavahi-glib-dev"},
          {"reference": "libavahi-glib1"},
          {"reference": "libavahi-gobject-dev"},
          {"reference": "libavahi-gobject0"},
          {"reference": "libavahi-ui-gtk3-0"},
          {"reference": "libavahi-ui-gtk3-dev"},
          {"reference": "python-avahi"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-10": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "10",
        "pkgs": [
          {"reference": "avahi"},
          {"reference": "avahi-compat-howl"},
          {"reference": "avahi-compat-howl-devel"},
          {"reference": "avahi-compat-libdns_sd"},
          {"reference": "avahi-compat-libdns_sd-devel"},
          {"reference": "avahi-devel"},
          {"reference": "avahi-glib"},
          {"reference": "avahi-glib-devel"},
          {"reference": "avahi-libs"},
          {"reference": "avahi-tools"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-6": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "6",
        "pkgs": [
          {"reference": "avahi"},
          {"reference": "avahi-autoipd"},
          {"reference": "avahi-compat-howl"},
          {"reference": "avahi-compat-howl-devel"},
          {"reference": "avahi-compat-libdns_sd"},
          {"reference": "avahi-compat-libdns_sd-devel"},
          {"reference": "avahi-devel"},
          {"reference": "avahi-dnsconfd"},
          {"reference": "avahi-glib"},
          {"reference": "avahi-glib-devel"},
          {"reference": "avahi-gobject"},
          {"reference": "avahi-gobject-devel"},
          {"reference": "avahi-libs"},
          {"reference": "avahi-qt3"},
          {"reference": "avahi-qt3-devel"},
          {"reference": "avahi-qt4"},
          {"reference": "avahi-qt4-devel"},
          {"reference": "avahi-tools"},
          {"reference": "avahi-ui"},
          {"reference": "avahi-ui-devel"},
          {"reference": "avahi-ui-tools"}
        ]
      }
    ]
  },
  "CentOS Linux-7": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "7",
        "pkgs": [
          {"reference": "avahi"},
          {"reference": "avahi-autoipd"},
          {"reference": "avahi-compat-howl"},
          {"reference": "avahi-compat-howl-devel"},
          {"reference": "avahi-compat-libdns_sd"},
          {"reference": "avahi-compat-libdns_sd-devel"},
          {"reference": "avahi-devel"},
          {"reference": "avahi-dnsconfd"},
          {"reference": "avahi-glib"},
          {"reference": "avahi-glib-devel"},
          {"reference": "avahi-gobject"},
          {"reference": "avahi-gobject-devel"},
          {"reference": "avahi-libs"},
          {"reference": "avahi-qt3"},
          {"reference": "avahi-qt3-devel"},
          {"reference": "avahi-qt4"},
          {"reference": "avahi-qt4-devel"},
          {"reference": "avahi-tools"},
          {"reference": "avahi-ui"},
          {"reference": "avahi-ui-devel"},
          {"reference": "avahi-ui-gtk3"},
          {"reference": "avahi-ui-tools"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-7": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "7",
        "pkgs": [
          {"reference": "avahi"},
          {"reference": "avahi-autoipd"},
          {"reference": "avahi-compat-howl"},
          {"reference": "avahi-compat-howl-devel"},
          {"reference": "avahi-compat-libdns_sd"},
          {"reference": "avahi-compat-libdns_sd-devel"},
          {"reference": "avahi-devel"},
          {"reference": "avahi-dnsconfd"},
          {"reference": "avahi-glib"},
          {"reference": "avahi-glib-devel"},
          {"reference": "avahi-gobject"},
          {"reference": "avahi-gobject-devel"},
          {"reference": "avahi-libs"},
          {"reference": "avahi-qt3"},
          {"reference": "avahi-qt3-devel"},
          {"reference": "avahi-qt4"},
          {"reference": "avahi-qt4-devel"},
          {"reference": "avahi-tools"},
          {"reference": "avahi-ui"},
          {"reference": "avahi-ui-devel"},
          {"reference": "avahi-ui-gtk3"},
          {"reference": "avahi-ui-tools"}
        ]
      }
    ]
  },
  "CentOS Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "avahi"},
          {"reference": "avahi-autoipd"},
          {"reference": "avahi-compat-howl"},
          {"reference": "avahi-compat-howl-devel"},
          {"reference": "avahi-compat-libdns_sd"},
          {"reference": "avahi-compat-libdns_sd-devel"},
          {"reference": "avahi-devel"},
          {"reference": "avahi-glib"},
          {"reference": "avahi-glib-devel"},
          {"reference": "avahi-gobject"},
          {"reference": "avahi-gobject-devel"},
          {"reference": "avahi-libs"},
          {"reference": "avahi-tools"},
          {"reference": "avahi-ui"},
          {"reference": "avahi-ui-devel"},
          {"reference": "avahi-ui-gtk3"},
          {"reference": "python3-avahi"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "avahi"},
          {"reference": "avahi-autoipd"},
          {"reference": "avahi-compat-howl"},
          {"reference": "avahi-compat-howl-devel"},
          {"reference": "avahi-compat-libdns_sd"},
          {"reference": "avahi-compat-libdns_sd-devel"},
          {"reference": "avahi-devel"},
          {"reference": "avahi-glib"},
          {"reference": "avahi-glib-devel"},
          {"reference": "avahi-gobject"},
          {"reference": "avahi-gobject-devel"},
          {"reference": "avahi-libs"},
          {"reference": "avahi-tools"},
          {"reference": "avahi-ui"},
          {"reference": "avahi-ui-devel"},
          {"reference": "avahi-ui-gtk3"},
          {"reference": "python3-avahi"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-9": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "9",
        "pkgs": [
          {"reference": "avahi"},
          {"reference": "avahi-autoipd"},
          {"reference": "avahi-compat-howl"},
          {"reference": "avahi-compat-howl-devel"},
          {"reference": "avahi-compat-libdns_sd"},
          {"reference": "avahi-compat-libdns_sd-devel"},
          {"reference": "avahi-devel"},
          {"reference": "avahi-glib"},
          {"reference": "avahi-glib-devel"},
          {"reference": "avahi-gobject"},
          {"reference": "avahi-gobject-devel"},
          {"reference": "avahi-libs"},
          {"reference": "avahi-tools"}
        ]
      }
    ]
  }
};

var distro_constraints_values = linux_unpatched::get_distro_constraints(distro_constraints_arr:distro_constraints_array);
if (empty_or_null(distro_constraints_values)) audit(AUDIT_HOST_NOT, 'affected');
var report = linux_unpatched::check_unpatched_constraints(distro_constraints_values:distro_constraints_values);

if (!empty_or_null(report))
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_NOTE,
      extra      : report
  );
  exit(0);
}
else
{
  audit(AUDIT_HOST_NOT, 'affected');
}

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22 May 2026 00:00Current
5.7Medium risk
Vulners AI Score5.7
CVSS 3.15.5
EPSS0.00152
SSVC
2