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Vulnerability record · CVE-2017-6519 · published 1 May 2017

CVE-2017-6519: Avahi origin validation error vulnerability

Avahi · Avahi

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.

9.1 CVSS 3.1 Critical EPSS 3.2% · top 12.2% CWE-346 · Origin validation error
9.1CVSS 3.1 base score, v2 6.4
3.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
14References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugzilla.redhat.com/show_bug.cgi?id=1426712 Issue TrackingPatchThird Party Advisory
https://github.com/lathiat/avahi/issues/203 ExploitThird Party Advisory
https://github.com/lathiat/avahi/issues/203#issuecomment-449536790 Third Party Advisory
https://lists.apache.org/thread.html/r1b103833cb5bc8466e24ff0ecc5e75b45a705334ab6a444e64e840a0%40%3Cissues.bookkeeper.ap
https://usn.ubuntu.com/3876-1/ Third Party Advisory
https://usn.ubuntu.com/3876-2/ Third Party Advisory
https://www.secfu.net/advisories Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1426712 Issue TrackingPatchThird Party Advisory
https://github.com/lathiat/avahi/issues/203 ExploitThird Party Advisory
https://github.com/lathiat/avahi/issues/203#issuecomment-449536790 Third Party Advisory
https://lists.apache.org/thread.html/r1b103833cb5bc8466e24ff0ecc5e75b45a705334ab6a444e64e840a0%40%3Cissues.bookkeeper.ap
https://usn.ubuntu.com/3876-1/ Third Party Advisory
https://usn.ubuntu.com/3876-2/ Third Party Advisory
https://www.secfu.net/advisories Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2017-6519), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.