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TI-2023-19852 Aliases CVE-2023-38472GHSA-4g3h-v9fp-pgm4

Reachable assertion in avahi_rdata_parse

Priority LOW 28CWE-617Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 12 fixed, 2 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-617.

Summary

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

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0032 25th percentileScored 2026-11-07
Fix Partial avahi (avahi): 0.9-rc1Red Hat: 4 advisoriesRed Hat: 12 fixed, 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
avahiavahibefore 0.9-rc10.9-rc1Patch availableCNA
Red HatRed Hat Enterprise Linux 6——No fix listedCNA
Red HatRed Hat Enterprise Linux 7——No fix listedCNA
Red HatRed Hat Enterprise Linux 8——No fix listedCNA
Red HatRed Hat Enterprise Linux 9——No fix listedCNA
FedoraFedora——No fix listedCNA
  • avahi Vendoravahi Affected before 0.9-rc1 Fixed in 0.9-rc1 Patch available CNA
  • Red Hat Enterprise Linux 6 VendorRed Hat Affected — Fixed in — No fix listed CNA
  • Red Hat Enterprise Linux 7 VendorRed Hat Affected — Fixed in — No fix listed CNA
  • Red Hat Enterprise Linux 8 VendorRed Hat Affected — Fixed in — No fix listed CNA
  • Red Hat Enterprise Linux 9 VendorRed Hat Affected — Fixed in — No fix listed CNA
  • Fedora VendorFedora Affected — Fixed in — No fix listed CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:a:avahi:avahi:*:*:*:*:*:*:*:*before 0.9Vulnerableavahi
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*8.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*9.0VulnerableRed Hat
  • cpe:2.3:a:avahi:avahi:*:*:*:*:*:*:*:* Versions before 0.9 Vulnerable ·avahi
  • cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Red Hat

Remediation

  • Fix · CNA avahi (avahi) Fixed in 0.9-rc1

Red Hat 4 advisories

  • RHSA-2024:2433 Released 2024-04-30 · Red Hat rating Moderate
    avahi security update
    • Red Hat Enterprise Linux AppStream (v. 9) avahi-glib-0.8-20.el9, avahi-tools-0.8-20.el9
    • Red Hat Enterprise Linux BaseOS (v. 9) avahi-0.8-20.el9, avahi-libs-0.8-20.el9
    • Red Hat Enterprise Linux CRB (v. 9) avahi-compat-howl-0.8-20.el9, avahi-compat-howl-devel-0.8-20.el9, avahi-compat-libdns_sd-0.8-20.el9 +3
  • RHSA-2024:0576 Released 2024-01-30 · Red Hat rating Moderate
    avahi security update
    • Red Hat CodeReady Linux Builder EUS (v.8.8) avahi-compat-howl-0.7-20.el8_8.4, avahi-compat-howl-devel-0.7-20.el8_8.4, avahi-compat-libdns_sd-0.7-20.el8_8.4 +6
    • Red Hat Enterprise Linux AppStream EUS (v.8.8) avahi-ui-gtk3-0.7-20.el8_8.4
    • Red Hat Enterprise Linux BaseOS EUS (v.8.8) avahi-0.7-20.el8_8.4, avahi-autoipd-0.7-20.el8_8.4, avahi-glib-0.7-20.el8_8.4 +3
  • RHSA-2024:0418 Released 2024-01-25 · Red Hat rating Moderate
    avahi security update
    • Red Hat CodeReady Linux Builder EUS (v.8.6) avahi-compat-howl-0.7-20.el8_6.3, avahi-compat-howl-devel-0.7-20.el8_6.3, avahi-compat-libdns_sd-0.7-20.el8_6.3 +6
    • Red Hat Enterprise Linux AppStream EUS (v.8.6) avahi-ui-gtk3-0.7-20.el8_6.3
    • Red Hat Enterprise Linux BaseOS EUS (v.8.6) avahi-0.7-20.el8_6.3, avahi-autoipd-0.7-20.el8_6.3, avahi-glib-0.7-20.el8_6.3 +3
Show 1 more Red Hat advisories
  • RHSA-2023:7836 Released 2023-12-14 · Red Hat rating Moderate
    avahi security update
    • Red Hat CodeReady Linux Builder (v. 8) avahi-compat-howl-0.7-21.el8_9.1, avahi-compat-howl-devel-0.7-21.el8_9.1, avahi-compat-libdns_sd-0.7-21.el8_9.1 +6
    • Red Hat Enterprise Linux AppStream (v. 8) avahi-tools-0.7-21.el8_9.1, avahi-ui-gtk3-0.7-21.el8_9.1
    • Red Hat Enterprise Linux BaseOS (v. 8) avahi-0.7-21.el8_9.1, avahi-autoipd-0.7-21.el8_9.1, avahi-glib-0.7-21.el8_9.1 +3

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    avahi 0.9-rc1

    5 records Highest priority Priority LOW 5 LOW

    Other records, highest priority first

    • TI-2023-19853 Reachable assertion in avahi_alternative_host_namePriority LOW 28
    • TI-2023-19851 Reachable assertion in dbus_set_host_namePriority LOW 28
    • TI-2023-19850 Reachable assertion in avahi_escape_labelPriority LOW 28
    Show all 5 records →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 7AffectedNo fix planned: Out of support scope
Red Hat CodeReady Linux Builder (v. 8)Fixed RHSA-2023:7836
Red Hat CodeReady Linux Builder EUS (v.8.6)Fixed RHSA-2024:0418
Red Hat CodeReady Linux Builder EUS (v.8.8)Fixed RHSA-2024:0576
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2023:7836
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2024:2433
Red Hat Enterprise Linux AppStream EUS (v.8.6)Fixed RHSA-2024:0418
Red Hat Enterprise Linux AppStream EUS (v.8.8)Fixed RHSA-2024:0576
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2023:7836
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2024:2433
Red Hat Enterprise Linux BaseOS EUS (v.8.6)Fixed RHSA-2024:0418
Red Hat Enterprise Linux BaseOS EUS (v.8.8)Fixed RHSA-2024:0576
Red Hat Enterprise Linux CRB (v. 9)Fixed RHSA-2024:2433

Timeline

  1. 2026-10-02 Threatist record created from CVE-2023-38472
  2. 2026-10-03 Alias added: GHSA-4g3h-v9fp-pgm4
  3. 2026-10-28 Fix available: [email protected] · CNA

References

Advisory 2

  • TI-2026-27157 Avahi: Reachable assertion in `transport_flags_from_domain()` via conflicting publish flags crashes avahi-daemon CVSS 3.1MEDIUM 5.5
  • TI-2025-37060 Avahi: simple protocol server ignores accepts unlimited connections and logs failures without limit CVSS 3.1MEDIUM 5.5
  • TI-2008-04834 The originates_from_local_legacy_unicast_socket function (avahi-core/server.c) in… CVSS 2.0MEDIUM 5.0
  • TI-2017-04303 avahi-daemon in Avahi through 0.6.32 and 0.7 inadvertently responds to IPv6 unicast… CVSS 3.1CRITICAL 9.1
  • TI-2011-00862 avahi-core/socket.c in avahi-daemon in Avahi before 0.6.29 allows remote attackers to… CVSS 2.0MEDIUM 5.0
  • TI-2021-08399 avahi-daemon-check-dns.sh in the Debian avahi package through 0.8-4 is executed as root… CVSS 3.1HIGH 7.8
See all 23 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences