CVE-2017-6519

CRITICAL

Avahi < 0.6.32 - Origin Validation Error

Title source: rule

Description

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.

References (7)

[Issue Tracking, Patch, Third Party Advisory] https://bugzilla.redhat.com/show_bug.cgi?id=1426712

[Exploit, Third Party Advisory] https://github.com/lathiat/avahi/issues/203

[Third Party Advisory] https://github.com/lathiat/avahi/issues/203#issuecomment-449536790

[Mailing List] https://lists.apache.org/thread.html/r1b103833cb5bc8466e24ff0ecc5e75b45a705334ab6a444e64e840a0%40%3Cissues.bookkeeper.apache.org%3E

[Third Party Advisory] https://usn.ubuntu.com/3876-1/

[Third Party Advisory] https://usn.ubuntu.com/3876-2/

[Third Party Advisory] https://www.secfu.net/advisories

Scores

CVSS v3 9.1

EPSS 0.0113

EPSS Percentile 78.1%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Classification

CWE

CWE-346

Status draft

Affected Products (7)

avahi/avahi < 0.6.32

avahi/avahi

canonical/ubuntu_linux

canonical/ubuntu_linux

canonical/ubuntu_linux

canonical/ubuntu_linux

canonical/ubuntu_linux

Timeline

Published May 01, 2017

Tracked Since Feb 18, 2026