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Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 25.10 : Avahi vulnerabilities (USN-7967-1)

medium Nessus Plugin ID 294829

Synopsis

The remote Ubuntu host is missing one or more security updates.

Description

The remote Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 25.10 host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-7967-1 advisory.

 It was discovered that Avahi incorrectly terminated when processing browser records with wide-area disabled. An attacker could possibly use this issue to cause Avahi to crash, resulting in a denial of service. (CVE-2025-68276)

 It was discovered that Avahi incorrectly terminated when processing unsolicited CNAME records pointing to resource records with short TTLs. An attacker could possibly use this issue to cause Avahi to crash, resulting in a denial of service. (CVE-2025-68468)

 It was discovered that Avahi incorrectly terminated when processing unsolicited CNAME records in quick succession. An attacker could possibly use this issue to cause Avahi to crash, resulting in a denial of service. (CVE-2025-68471)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Update the affected packages.

See Also

https://ubuntu.com/security/notices/USN-7967-1

Plugin Details

Severity: Medium

ID: 294829

File Name: ubuntu_USN-7967-1.nasl

Version: 1.1

Type: local

Agent: unix

Published: 1/21/2026

Updated: 1/21/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.1

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

CVSS Score Source: CVE-2025-68471

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.9

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:canonical:ubuntu_linux:libavahi-qt4-dev, p-cpe:/a:canonical:ubuntu_linux:libavahi-client3, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:libavahi-gobject-dev, p-cpe:/a:canonical:ubuntu_linux:libavahi-core7, p-cpe:/a:canonical:ubuntu_linux:libavahi-glib-dev, p-cpe:/a:canonical:ubuntu_linux:avahi-discover, p-cpe:/a:canonical:ubuntu_linux:libavahi-ui-dev, p-cpe:/a:canonical:ubuntu_linux:python-avahi, cpe:/o:canonical:ubuntu_linux:25.10, p-cpe:/a:canonical:ubuntu_linux:libavahi-ui-gtk3-0, p-cpe:/a:canonical:ubuntu_linux:avahi-daemon, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:avahi-utils, p-cpe:/a:canonical:ubuntu_linux:avahi-autoipd, p-cpe:/a:canonical:ubuntu_linux:libavahi-core-dev, p-cpe:/a:canonical:ubuntu_linux:gir1.2-avahi-0.6, p-cpe:/a:canonical:ubuntu_linux:libavahi-compat-libdnssd1, p-cpe:/a:canonical:ubuntu_linux:libavahi-compat-libdnssd-dev, p-cpe:/a:canonical:ubuntu_linux:libavahi-glib1, cpe:/o:canonical:ubuntu_linux:14.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:libavahi-common-dev, p-cpe:/a:canonical:ubuntu_linux:libavahi-client-dev, p-cpe:/a:canonical:ubuntu_linux:avahi-dnsconfd, p-cpe:/a:canonical:ubuntu_linux:libavahi-common3, cpe:/o:canonical:ubuntu_linux:16.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:python3-avahi, p-cpe:/a:canonical:ubuntu_linux:libavahi-qt4-1, p-cpe:/a:canonical:ubuntu_linux:libavahi-gobject0, p-cpe:/a:canonical:ubuntu_linux:avahi-ui-utils, p-cpe:/a:canonical:ubuntu_linux:libavahi-ui0, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:libavahi-common-data, p-cpe:/a:canonical:ubuntu_linux:libavahi-ui-gtk3-dev

Required KB Items: Host/cpu, Host/Debian/dpkg-l, Host/Ubuntu, Host/Ubuntu/release

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 1/19/2026

Vulnerability Publication Date: 1/12/2026

Reference Information

CVE: CVE-2025-68276, CVE-2025-68468, CVE-2025-68471

USN: 7967-1