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CVE-2017-6519

30
FAUCET Score

CVE-2017-6519 describes a critical vulnerability in avahi-daemon, affecting Avahi through versions 0.6.32 and 0.7, as well as Canonical Ubuntu Linux. This flaw allows remote attackers to trigger a denial of service via traffic amplification and potentially leak sensitive information by exploiting the daemon's inadvertent response to off-link IPv6 unicast queries on UDP port 5353. With a CVSS score of 9.1 (CRITICAL), the vulnerability has a network attack vector, low attack complexity, and high impacts on confidentiality and availability. Despite its severity, there is no known active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 0.6.32CPE matchmatch criteria
cpe:2.3:a:avahi:avahi:*:*:*:*:*:*:*:*
0.7CPE matchmatch criteria
cpe:2.3:a:avahi:avahi:0.7:*:*:*:*:*:*:*
12.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:esm:*:*:*
14.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
16.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.1CRITICAL

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.2
CvssVersion
3.0

Exploit Intelligence

EPSS Score
3.08%
Probability of exploitation in next 30 days
EPSS Percentile
86.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0308 is in the 78th percentile among its peer group of 36,833 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (10)

microsoftpatch availablevia msrc
Product: CBL Mariner 2.0 ARMFixed in: 0.8-1
microsoftpatch availablevia msrc
Product: CBL Mariner 2.0 x64Fixed in: 0.8-1
microsoftpatch availablevia msrc
Product: 16915-16823Fixed in: 0.8-1
microsoftpatch availablevia msrc
Product: cbl2 avahi 0.8-1 on CBL Mariner 2.0Fixed in: 0.8-1
redhatpatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: avahi-0:0.6.31-20.el7
View patch
redhatno patchvia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: avahi
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: avahi
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: avahi
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: avahi

Vendor Advisories (3)

microsoft2021-Dec/CVE-2017-6519

CVE-2017-6519

Dec 14, 2021
microsoft2017-May/CVE-2017-6519Critical

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.

May 9, 2017
redhatCVE-2017-6519Low

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

Mar 31, 2015

References

bugzilla.redhat.com / show_bug.cgi
Issue TrackingPatchThird Party Advisory
github.com / lathiat/avahi/issues/203
ExploitThird Party Advisory
github.com / lathiat/avahi/issues/203
Third Party Advisory
lists.apache.org / thread.html/r1b103833cb5bc8466e24ff0ecc5e75b45a705334ab6a444e64e840a0%40%3Cissues.bookkeeper.apache.org%3E
usn.ubuntu.com / 3876-1
Third Party Advisory
usn.ubuntu.com / 3876-2
Third Party Advisory
secfu.net / advisories
Third Party Advisory