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Fencer Vulns
medium 6.2

CVE-2023-38473 json

Reachable assertion in avahi_alternative_host_name

published 2023-11-02 3 y ago modified 2026-10-28 11 d ago also EUVD-2023-42289

cvss
6.2
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 25%
public exploits
0
none known

Summary

A vulnerability was found in Avahi. A reachable assertion exists in the avahi_alternative_host_name() function.

Patch / fix

  • avahi avahi 0.9-rc1
  • avahi Debian 12 0.8-10+deb12u1
  • avahi Debian 14, Debian 13 0.8-14

debian advisories DEBIAN-CVE-2023-38473

  • avahi Ubuntu 20.04 LTS 0.7-4ubuntu7.3
  • avahi Ubuntu 22.04 LTS 0.8-5ubuntu5.2
  • avahi Ubuntu Pro 14.04 LTS 0.6.31-4ubuntu1.3+esm3
  • avahi Ubuntu Pro 16.04 LTS 0.6.32~rc+dfsg-1ubuntu2.3+esm3
  • avahi Ubuntu Pro 18.04 LTS 0.7-3.1ubuntu1.3+esm2

ubuntu advisories UBUNTU-CVE-2023-38473

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • avahi RHEL 9 0.8-20.el9
  • avahi-glib RHEL 9 0.8-20.el9
  • avahi-libs RHEL 9 0.8-20.el9
  • avahi-tools RHEL 9 0.8-20.el9
  • avahi-compat-howl RHEL 9 0.8-20.el9
  • avahi-compat-libdns_sd RHEL 9 0.8-20.el9
  • avahi RHEL 8 0.7-21.el8_9.1
  • avahi-ui RHEL 8 0.7-21.el8_9.1

red hat advisories RHSA-2024:2433RHSA-2024:0576RHSA-2024:0418RHSA-2023:7836

  • avahi SLE Micro 5.2, Manager Server 4.2, Manager Proxy 4.2 0.7-150100.3.29.1
  • avahi-glib2 openSUSE Leap 15.4, Manager Server 4.2, Manager Proxy 4.2 0.7-150100.3.29.1
  • avahi SLE Module for Package Hub 15 SP5, SLE Module for Package Hub 15 SP4, SLE Module for Desktop Applications 15 SP5 +10 more 0.8-150400.7.10.1
  • avahi-qt5 openSUSE Leap 15.5, openSUSE Leap 15.4 0.8-150400.7.10.1
  • avahi-glib2 SLE Module for Desktop Applications 15 SP5, SLE Module for Desktop Applications 15 SP4, SLE Module for Basesystem 15 SP5 +3 more 0.8-150400.7.10.1
  • avahi SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 0.6.32-32.21.1
  • avahi-glib2 SLES for SAP 12 SP5, SLES 12 SP5, SLE Workstation Extension 12 SP5 +1 more 0.6.32-32.21.1

suse advisories SUSE-SU-2023:4910-1SUSE-SU-2023:4503-1SUSE-SU-2023:4499-1

  • avahi openSUSE Tumbleweed 0.8-26.1

opensuse advisories openSUSE-SU-2024:13373-1

  • avahi AlmaLinux 9 0.8-20.el9
  • avahi-glib AlmaLinux 9 0.8-20.el9
  • avahi-libs AlmaLinux 9 0.8-20.el9
  • avahi-tools AlmaLinux 9 0.8-20.el9
  • avahi-compat-howl AlmaLinux 9 0.8-20.el9
  • avahi-compat-libdns_sd AlmaLinux 9 0.8-20.el9
  • avahi AlmaLinux 8 0.7-21.el8_9.1
  • avahi-ui AlmaLinux 8 0.7-21.el8_9.1

almalinux advisories ALSA-2024:2433ALSA-2023:7836

  • avahi Rocky Linux 8 0.7-21.el8_9.1

rocky linux advisories RLSA-2023:7836

  • avahi Alpine 3.24, Alpine 3.23, Alpine 3.22 +3 more 0.8-r14

alpine advisories ALPINE-CVE-2023-38473

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • avahi CBL-Mariner 2.0 0.8-3
  • avahi Azure Linux 3.0 0.8-4

azure linux advisories AZL-31757AZL-34553

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-38473 updated cvss 6.2

avahi: Reachable assertion in avahi_alternative_host_name

  • Red Hat Enterprise Linux 6 avahi, avahi-ui, avahi-qt3, avahi-qt4, avahi-glib, avahi-libs, +7 more Red Hat Enterprise Linux 7 avahi, avahi-ui, avahi-qt3, avahi-qt4, avahi-glib, avahi-libs, +8 more
    affected: no fix planned “Out of support scope”
  • Red Hat CodeReady Linux Builder (v. 8) avahi-ui 0.7-21.el8_9.1, avahi-compat-howl 0.7-21.el8_9.1, avahi-compat-libdns_sd 0.7-21.el8_9.1
    fixed: vendor fix RHSA-2023:7836
  • Red Hat CodeReady Linux Builder EUS (v.8.6) avahi-ui 0.7-20.el8_6.3, avahi-compat-howl 0.7-20.el8_6.3, avahi-compat-libdns_sd 0.7-20.el8_6.3
    fixed: vendor fix RHSA-2024:0418
  • Red Hat CodeReady Linux Builder EUS (v.8.8) avahi-ui 0.7-20.el8_8.4, avahi-compat-howl 0.7-20.el8_8.4, avahi-compat-libdns_sd 0.7-20.el8_8.4
    fixed: vendor fix RHSA-2024:0576
  • Red Hat Enterprise Linux AppStream (v. 8) avahi-tools 0.7-21.el8_9.1, avahi-ui-gtk3 0.7-21.el8_9.1
    fixed: vendor fix RHSA-2023:7836
  • Red Hat Enterprise Linux AppStream (v. 9) avahi-glib 0.8-20.el9, avahi-tools 0.8-20.el9
    fixed: vendor fix RHSA-2024:2433
  • Red Hat Enterprise Linux AppStream EUS (v.8.6) avahi-ui-gtk3 0.7-20.el8_6.3
    fixed: vendor fix RHSA-2024:0418
  • Red Hat Enterprise Linux AppStream EUS (v.8.8) avahi-ui-gtk3 0.7-20.el8_8.4
    fixed: vendor fix RHSA-2024:0576
show 5 more
  • Red Hat Enterprise Linux BaseOS (v. 8) avahi 0.7-21.el8_9.1, avahi-glib 0.7-21.el8_9.1, avahi-libs 0.7-21.el8_9.1, avahi-autoipd 0.7-21.el8_9.1, avahi-gobject 0.7-21.el8_9.1, python3-avahi 0.7-21.el8_9.1
    fixed: vendor fix RHSA-2023:7836
  • Red Hat Enterprise Linux BaseOS (v. 9) avahi 0.8-20.el9, avahi-libs 0.8-20.el9
    fixed: vendor fix RHSA-2024:2433
  • Red Hat Enterprise Linux BaseOS EUS (v.8.6) avahi 0.7-20.el8_6.3, avahi-glib 0.7-20.el8_6.3, avahi-libs 0.7-20.el8_6.3, avahi-autoipd 0.7-20.el8_6.3, avahi-gobject 0.7-20.el8_6.3, python3-avahi 0.7-20.el8_6.3
    fixed: vendor fix RHSA-2024:0418
  • Red Hat Enterprise Linux BaseOS EUS (v.8.8) avahi 0.7-20.el8_8.4, avahi-glib 0.7-20.el8_8.4, avahi-libs 0.7-20.el8_8.4, avahi-autoipd 0.7-20.el8_8.4, avahi-gobject 0.7-20.el8_8.4, python3-avahi 0.7-20.el8_8.4
    fixed: vendor fix RHSA-2024:0576
  • Red Hat Enterprise Linux CRB (v. 9) avahi-compat-howl 0.8-20.el9, avahi-compat-libdns_sd 0.8-20.el9
    fixed: vendor fix RHSA-2024:2433

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.32% chance of exploitation in the next 30 days, higher than 25% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.2 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

  • avahi avahi
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Fedora Fedora

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.