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Fencer Intel
critical 9.1

CVE-2017-6519 json

avahi-daemon in Avahi through 0.6.32 and 0.7 inadvertently responds to IPv6 unicast queries with source addresses that are not on-link, whi…

published 2017-05-01 9 y ago modified 2026-06-17 4 mo ago also EUVD-2017-15575

cvss
9.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
3.2%
EPSS 3.2% chance of exploitation in 30 days, percentile 88%
public exploits
0
none known

Summary

avahi-daemon in Avahi through 0.6.32 and 0.7 inadvertently responds to IPv6 unicast queries with source addresses that are not on-link, which allows remote attackers to cause a denial of service (traffic amplification) and may cause information leakage by obtaining potentially sensitive information from the responding device via port-5353 UDP packets. NOTE: this may overlap CVE-2015-2809.

Patch / fix

  • avahi Debian 14, Debian 13, Debian 12 0.7-5

debian advisories DEBIAN-CVE-2017-6519

  • avahi Ubuntu 14.04 LTS 0.6.31-4ubuntu1.3
  • avahi Ubuntu 16.04 LTS 0.6.32~rc+dfsg-1ubuntu2.3
  • avahi Ubuntu 18.04 LTS 0.7-3.1ubuntu1.2

ubuntu advisories UBUNTU-CVE-2017-6519

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 7 0.6.31-20.el7
  • avahi-ui RHEL 7 0.6.31-20.el7
  • avahi-qt3 RHEL 7 0.6.31-20.el7
  • avahi-qt4 RHEL 7 0.6.31-20.el7
  • avahi-glib RHEL 7 0.6.31-20.el7
  • avahi-libs RHEL 7 0.6.31-20.el7
  • avahi-tools RHEL 7 0.6.31-20.el7
  • avahi-autoipd RHEL 7 0.6.31-20.el7

red hat advisories RHSA-2020:1176

  • avahi openSUSE Tumbleweed 0.8-7.2

opensuse advisories openSUSE-SU-2024:10643-1

  • avahi Alpine 3.24, Alpine 3.23, Alpine 3.22 +14 more 0.7-r2
  • avahi Alpine 3.7 0.6.32-r5

alpine advisories ALPINE-CVE-2017-6519

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 0.8-1

azure linux advisories AZL-6322

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-2017-6519 updated cvss 5.8

avahi: Multicast DNS responds to unicast queries outside of local network

  • Red Hat Enterprise Linux 5 avahi Red Hat Enterprise Linux 6 avahi, avahi-ui, avahi-qt3, avahi-qt4, avahi-glib, avahi-libs, +7 more Red Hat Enterprise Linux 8 avahi, avahi-ui, avahi-glib, avahi-libs, avahi-tools, avahi-autoipd, +5 more
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Enterprise Linux 9 avahi, avahi-glib, avahi-libs, avahi-tools, avahi-autoipd, avahi-gobject, +2 more
    affected: workaround, no fix available
  • Red Hat Enterprise Linux Client (v. 7) avahi 0.6.31-20.el7, avahi-glib 0.6.31-20.el7, avahi-libs 0.6.31-20.el7, avahi-autoipd 0.6.31-20.el7, avahi-gobject 0.6.31-20.el7, avahi-ui-gtk3 0.6.31-20.el7 Red Hat Enterprise Linux Client Optional (v. 7) avahi-ui 0.6.31-20.el7, avahi-qt3 0.6.31-20.el7, avahi-qt4 0.6.31-20.el7, avahi-tools 0.6.31-20.el7, avahi-dnsconfd 0.6.31-20.el7, avahi-ui-tools 0.6.31-20.el7, +2 more Red Hat Enterprise Linux ComputeNode (v. 7) avahi 0.6.31-20.el7, avahi-glib 0.6.31-20.el7, avahi-libs 0.6.31-20.el7, avahi-autoipd 0.6.31-20.el7 Red Hat Enterprise Linux ComputeNode Optional (v. 7) avahi-ui 0.6.31-20.el7, avahi-qt3 0.6.31-20.el7, avahi-qt4 0.6.31-20.el7, avahi-tools 0.6.31-20.el7, avahi-gobject 0.6.31-20.el7, avahi-ui-gtk3 0.6.31-20.el7, +4 more Red Hat Enterprise Linux Server (v. 7) avahi 0.6.31-20.el7, avahi-glib 0.6.31-20.el7, avahi-libs 0.6.31-20.el7, avahi-autoipd 0.6.31-20.el7, avahi-gobject 0.6.31-20.el7, avahi-ui-gtk3 0.6.31-20.el7 Red Hat Enterprise Linux Server Optional (v. 7) avahi-ui 0.6.31-20.el7, avahi-qt3 0.6.31-20.el7, avahi-qt4 0.6.31-20.el7, avahi-tools 0.6.31-20.el7, avahi-dnsconfd 0.6.31-20.el7, avahi-ui-tools 0.6.31-20.el7, +2 more
    +2 more products
    Red Hat Enterprise Linux Workstation (v. 7) avahi 0.6.31-20.el7, avahi-glib 0.6.31-20.el7, avahi-libs 0.6.31-20.el7, avahi-autoipd 0.6.31-20.el7, avahi-gobject 0.6.31-20.el7, avahi-ui-gtk3 0.6.31-20.el7 Red Hat Enterprise Linux Workstation Optional (v. 7) avahi-ui 0.6.31-20.el7, avahi-qt3 0.6.31-20.el7, avahi-qt4 0.6.31-20.el7, avahi-tools 0.6.31-20.el7, avahi-dnsconfd 0.6.31-20.el7, avahi-ui-tools 0.6.31-20.el7, +2 more
    fixed: vendor fix RHSA-2020:1176

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
yes
Technical impact
partial
Assessed
11 mo ago

Exploit prediction

3.24% chance of exploitation in the next 30 days, higher than 88% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • github.com https://github.com/lathiat/avahi/issues/203 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
CNA 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
NVD 3.0 9.1 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
NVD 2.0 6.4 AV:N/AC:L/Au:N/C:P/I:N/A:P

Classification

Weakness

References

Sources

Fencer Intel 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.