Is CVE-2017-6519 in the CISA KEV catalog?

No. CVE-2017-6519 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2017-6519?

CVE-2017-6519 has a CVSS v3 base score of 9.1 (CRITICAL).

What is the EPSS score for CVE-2017-6519?

CVE-2017-6519 has an EPSS score of 3.08% (86th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2017-6519?

Upgrade avahi on debian 11 to 0.7-5 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2017-6519

CRITICALEPSS 86th pctl

9.1

CVSS v3

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.

CWE-346

How to fix

Remediation Available

avahiDebian

Fixed in:0.7-5CVE-2017-6519

avahiUbuntu

Fixed in:0.6.31-4ubuntu1.3USN-3876-1

Fixed in:0.6.32~rc+dfsg-1ubuntu2.3USN-3876-1

Fixed in:0.7-3.1ubuntu1.2USN-3876-1

avahi-daemonUbuntu

Fixed in:0.6.31-4ubuntu1.3USN-3876-1

Fixed in:0.6.32~rc+dfsg-1ubuntu2.3USN-3876-1

Fixed in:0.7-3.1ubuntu1.2USN-3876-1

libavahi-core7Ubuntu

Fixed in:0.6.31-4ubuntu1.3USN-3876-1

Fixed in:0.6.32~rc+dfsg-1ubuntu2.3USN-3876-1

Fixed in:0.7-3.1ubuntu1.2USN-3876-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

3.08%probability of exploitation in 30 days

86thpercentile

Elevated risk: more likely to be exploited than 86% of all known CVEs.

References

Patch1

bugzilla.redhat.com

Exploit1

github.com

Third-Party Advisory4

Other references1

lists.apache.org

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-13.