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TI-2017-04303 Aliases CVE-2017-6519GHSA-6vpj-pr2c-5mm2

avahi-daemon in Avahi through 0.6.32 and 0.7 inadvertently responds to IPv6 unicast…

Priority MEDIUM 51CWE-346Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · None · High
Fix status
Partial Red Hat: 8 fixed, 4 without a fix

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-346.

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.03238 88th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial Red Hat: 1 advisoryRed Hat: 8 fixed, 4 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
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
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 7

CPEVersionsRoleVendor
cpe:2.3:a:avahi:avahi:*:*:*:*:*:*:*:*up to 0.6.32Vulnerableavahi
cpe:2.3:a:avahi:avahi:0.7:*:*:*:*:*:*:*0.7Vulnerableavahi
cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:esm:*:*:*12.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*14.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*16.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*18.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*18.10VulnerableCanonical
  • cpe:2.3:a:avahi:avahi:*:*:*:*:*:*:*:* Versions up to 0.6.32 Vulnerable ·avahi
  • cpe:2.3:a:avahi:avahi:0.7:*:*:*:*:*:*:* Versions 0.7 Vulnerable ·avahi
  • cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:esm:*:*:* Versions 12.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:* Versions 14.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:* Versions 16.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* Versions 18.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:* Versions 18.10 Vulnerable ·Canonical

Remediation

Red Hat 1 advisory

  • RHSA-2020:1176 Released 2020-03-31 · Red Hat rating Low
    avahi security update
    • Red Hat Enterprise Linux Client (v. 7) avahi-0.6.31-20.el7, avahi-autoipd-0.6.31-20.el7, avahi-glib-0.6.31-20.el7 +3
    • Red Hat Enterprise Linux Client Optional (v. 7) avahi-compat-howl-0.6.31-20.el7, avahi-compat-howl-devel-0.6.31-20.el7, avahi-compat-libdns_sd-0.6.31-20.el7 +13
    • Red Hat Enterprise Linux ComputeNode (v. 7) avahi-0.6.31-20.el7, avahi-autoipd-0.6.31-20.el7, avahi-glib-0.6.31-20.el7 +1
    • Red Hat Enterprise Linux ComputeNode Optional (v. 7) avahi-compat-howl-0.6.31-20.el7, avahi-compat-howl-devel-0.6.31-20.el7, avahi-compat-libdns_sd-0.6.31-20.el7 +15
    • Red Hat Enterprise Linux Server (v. 7) avahi-0.6.31-20.el7, avahi-0.6.31-20.el7.ppc, avahi-autoipd-0.6.31-20.el7 +8
    • Red Hat Enterprise Linux Server Optional (v. 7) avahi-compat-howl-0.6.31-20.el7, avahi-compat-howl-0.6.31-20.el7.ppc, avahi-compat-howl-devel-0.6.31-20.el7 +26
    • Red Hat Enterprise Linux Workstation (v. 7) avahi-0.6.31-20.el7, avahi-autoipd-0.6.31-20.el7, avahi-glib-0.6.31-20.el7 +3
    • Red Hat Enterprise Linux Workstation Optional (v. 7) avahi-compat-howl-0.6.31-20.el7, avahi-compat-howl-devel-0.6.31-20.el7, avahi-compat-libdns_sd-0.6.31-20.el7 +13

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux 5AffectedNo fix planned: Will not fix
Red Hat Enterprise Linux 6AffectedNo fix planned: Will not fix
Red Hat Enterprise Linux 8AffectedNo fix planned: Will not fix
Red Hat Enterprise Linux 9AffectedNo fix yet
Red Hat Enterprise Linux Client (v. 7)Fixed RHSA-2020:1176
Red Hat Enterprise Linux Client Optional (v. 7)Fixed RHSA-2020:1176
Red Hat Enterprise Linux ComputeNode (v. 7)Fixed RHSA-2020:1176
Red Hat Enterprise Linux ComputeNode Optional (v. 7)Fixed RHSA-2020:1176
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2020:1176
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2020:1176
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2020:1176
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2020:1176

Timeline

  1. 2026-10-02 Threatist record created from CVE-2017-6519
  2. 2026-10-03 Alias added: GHSA-6vpj-pr2c-5mm2

References

Exploit 1

Patch 1

Advisory 4

Other 1

Sources

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