CVE-2017-6519
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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (3.24%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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
- 9.1 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- EPSS
- 3.24% probability · 88th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-346
- Affected
- avahi/avahi · canonical/ubuntu linux
- Source
- cve@mitre.org
EPSS 3.2% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.