CVE-2017-6519

Name: CVE-2017-6519
Creator: NVD / NIST
Published: 2017-05-01T01:59:00.297+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.1/10EPSS 3.08%

Last modified Jun 17, 2026

CVE-2017-6519 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. 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.. EPSS estimates a 3.08% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.1/10

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

EPSS Probability

3.08%

86.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Avahi	Avahi	<= 0.6.32
Avahi	Avahi	0.7
Canonical	Ubuntu Linux	12.04
Canonical	Ubuntu Linux	14.04
Canonical	Ubuntu Linux	16.04
Canonical	Ubuntu Linux	18.04
Canonical	Ubuntu Linux	18.10

References

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

Timeline

Published: May 1, 2017
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2017-6519?

How severe is CVE-2017-6519?

CVE-2017-6519 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 3.08% probability of exploitation in the next 30 days.

How do I fix CVE-2017-6519?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2017-6519?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST