What’s Vulnerable › Vulnerabilities

CVE-2017-6519

• Severity: critical (CVSS 9.1 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2017-05-01 · updated 2026-06-17
• Weakness: CWE-346

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.

Affected products

• avahi: through 0.6.32; 0.7
• Canonical Ubuntu Linux: 12.04, 14.04, 16.04, 18.04, 18.10

References

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

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